KB Financial (KB) 20-F 27 Apr 21 2020 FY Annual report (foreign) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2020shares
Document and Entity Information [Abstract]
Document Type	20-F
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Registrant Name	KB Financial Group Inc.
Entity Central Index Key	0001445930
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock Shares Outstanding	389,634,335
Entity Well Known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Icfr Auditor Attestation Flag	true
Entity Address Country	KR

Consolidated Statement Of Finan

Consolidated Statement Of Financial Position $ in Thousands, ₩ in Millions		Dec. 31, 2020KRW (₩)		Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
ASSETS
Cash and due from financial institutions		₩ 25,608,842		$ 23,578,497	₩ 20,837,878
Financial assets at fair value through profit or loss		61,035,455		56,196,385	53,549,086
Derivative financial assets		5,545,385		5,105,730	3,190,673
Loans measured at amortized cost		377,166,984		347,264,074	339,684,059
Financial investments		98,695,426		90,870,562	71,782,606
Investments in associates and joint ventures		771,435	[1]	710,274	598,240	[1]
Property and equipment		5,433,554		5,002,766	5,067,377
Investment property		2,533,539		2,332,673	2,827,988
Intangible assets		3,351,133		3,085,445	2,737,813
Net defined benefit assets		2,845		2,620	946
Current income tax assets		109,772		101,069	19,095
Deferred income tax assets		65,058		59,900	3,597
Assets held for sale		197,727		182,051	23,151
Other assets		30,155,037		27,764,256	18,215,608
Total assets		610,672,192	[2]	562,256,302	518,538,117	[2]
LIABILITIES
Financial liabilities at fair value through profit or loss		11,810,058		10,873,722	15,368,153
Derivative financial liabilities		5,222,897		4,808,810	3,007,341
Deposits		338,580,220		311,736,583	305,592,771
Borrowings		49,827,156		45,876,712	37,818,860
Debentures		62,760,687		57,784,835	50,935,583
Provisions		714,903		658,223	527,929
Net defined benefit liabilities		248,226		228,546	253,989
Current income tax liabilities		764,981		704,331	432,431
Deferred income tax liabilities		1,162,286		1,070,137	777,793
Insurance liabilities		54,415,296		50,101,091	34,966,683
Other liabilities		41,804,023		38,489,677	29,737,259
Total liabilities		567,310,733	[2]	522,332,667	479,418,792	[2]
TOTAL EQUITY
Share capital		2,090,558		1,924,812	2,090,558
Hybrid securities		1,695,988		1,561,525	399,205
Capital surplus		16,723,589		15,397,693	17,122,777
Accumulated other comprehensive income		612,337		563,789	348,021
Retained earnings		22,517,392	[3]	20,732,148	19,709,545
Treasury shares		(1,136,188)		(1,046,108)	(1,136,188)
Equity attributable to shareholders of the parent company		42,503,676		39,133,859	38,533,918
Non-controlling interests		857,783		789,776	585,407
Total equity	[4]	43,361,459		39,923,635	39,119,325
Total liabilities and equity		₩ 610,672,192		$ 562,256,302	₩ 518,538,117
[1]	Gains on disposal of investments in associates and joint ventures amount to KRW 1,423 million KRW 24,768 million for the years ended December 31, 2019 and 2020, respectively.
[2]	Assets and liabilities of the reporting segments are amounts before intersegment transactions.
[3]	Retained earnings restricted for dividend at subsidiaries level pursuant to law and regulations amounts to KRW 3,587,439 million as of December 31, 2020.
[4]	The consolidated statements of changes in equity for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)₩ / shares	Dec. 31, 2020USD ($)$ / shares	Dec. 31, 2019KRW (₩)₩ / shares	Dec. 31, 2018KRW (₩)₩ / shares
Statement Of Comprehensive Income Abstract [Abstract]
Interest income	[1]	₩ 14,485,747	$ 13,337,275	₩ 14,639,187	₩ 13,734,569
Interest income from financial instruments at fair value through other comprehensive income and amortized cost	[1]	13,826,382	12,730,186	13,935,124	12,986,209
Interest income from financial instruments at fair value through profit or loss	[1]	659,365	607,089	704,063	748,360
Interest expense	[1]	(4,763,473)	(4,385,812)	(5,442,400)	(4,829,641)
Net interest income	[1]	9,722,274	8,951,463	9,196,787	8,904,928
Fee and commission income	[1]	4,527,024	4,168,109	3,879,247	3,717,720
Fee and commission expense	[1]	(1,568,085)	(1,443,763)	(1,524,243)	(1,474,344)
Net fee and commission income	[1]	2,958,939	2,724,346	2,355,004	2,243,376
Insurance income	[1]	14,386,640	13,246,025	12,317,182	11,975,070
Insurance expense	[1]	(14,086,647)	(12,969,816)	(12,017,670)	(11,484,954)
Net insurance income	[1]	299,993	276,209	299,512	490,116
Net gains on financial instruments at fair value through profit or loss before applying overlay approach	[1]	1,221,610	1,124,757	912,187	350,490
Net gains (losses) on overlay adjustment	[1]	(210,244)	(193,575)	(268,315)	813
Net gains on financial instruments at fair value through profit or loss	[1]	1,011,366	931,182	643,872	351,303
Net other operating expenses	[1]	(1,499,930)	(1,381,011)	(1,063,324)	(1,130,036)
General and administrative expenses	[1]	(6,833,152)	(6,291,399)	(6,271,017)	(5,918,512)
Operating profit before provision for credit losses	[1]	5,659,490	5,210,790	5,160,834	4,941,175
Provision for credit losses	[1],[2]	(1,043,498)	(960,767)	(670,185)	(673,694)
Net operating income	[1]	4,615,992	4,250,023	4,490,649	4,267,481
Share of profit (losses) of investments in associates and joint ventures	[1],[2]	(43,750)	(40,281)	16,451	24,260
Net other non-operating income	[1]	189,390	174,374	26,886	9,791
Net non-operating income	[1]	145,640	134,093	43,337	34,051
Profit before income tax expense	[1]	4,761,632	4,384,116	4,533,986	4,301,532
Income tax expense	[1]	(1,259,351)	(1,159,506)	(1,220,787)	(1,239,586)
Profit for the year	[1],[2],[3]	3,502,281	3,224,610	3,313,199	3,061,946
Items that will not be reclassified to profit or loss
Remeasurements of net defined benefit liabilities	[1],[3]	(10,385)	(9,561)	(55,827)	(138,016)
Share of other comprehensive loss of associates and joint ventures	[1]	(1)	(1)	(105)	(74)
Net gains (losses) on equity instruments at fair value through other comprehensive income	[1]	822,140	756,958	(17,329)	(31,169)
Fair value changes on financial liabilities designated at fair value due to own credit risk	[1],[3]	8,819	8,120	(11,372)	1,484
Items that will not be reclassified to profit or loss (Sub Total)	[1]	820,573	755,516	(84,633)	(167,775)
Items that may be reclassified subsequently to profit or loss
Exchange differences on translating foreign operations	[1],[3]	(187,283)	(172,435)	37,861	48,820
Net gains (losses) on debt instruments at fair value through other comprehensive income	[1]	(356,572)	(328,302)	35,490	119,182
Shares of other comprehensive income (loss) of associates and joint ventures	[1]	(6,846)	(6,303)	7,800	(3,659)
Losses on cash flow hedging instruments	[1],[3]	(1,264)	(1,164)	(33,182)	(9,038)
Gains (losses) on hedging instruments of net investments in foreign operations	[1],[3]	64,269	59,174	(8,900)	(27,134)
Other comprehensive income (loss) arising from separate account	[1]	(9,683)	(8,915)	3,364	28,709
Net gains on overlay approach adjustment	[1],[3]	152,125	140,064	194,223	413
Items that may be reclassified subsequently to profit or loss(Sub Total)	[1]	(345,254)	(317,881)	236,656	157,293
Other comprehensive income(loss) for the year, net of tax	[1]	475,319	437,635	152,023	(10,482)
Total comprehensive income for the year	[1]	3,977,600	3,662,245	3,465,222	3,051,464
Profit attributable to:
Shareholders of the parent company	[1]	3,455,151	3,181,217	3,311,828	3,061,191
Non-controlling interests	[1]	47,130	43,393	1,371	755
Profit attributable (Sub Total)	[1],[2],[3]	3,502,281	3,224,610	3,313,199	3,061,946
Comprehensive Income Attributable To Abstract [Abstract]
Shareholders of the parent company	[1]	3,956,113	3,642,462	3,463,567	3,050,805
Non-controlling interests	[1]	21,487	19,783	1,655	659
Total comprehensive income for the year	[1]	₩ 3,977,600	$ 3,662,245	₩ 3,465,222	₩ 3,051,464
Earnings Per Share
Basic earnings per share | (per share)	[1]	₩ 8,809	$ 8.11	₩ 8,451	₩ 7,721
Diluted earnings per share | (per share)	[1]	₩ 8,697	$ 8.01	₩ 8,389	₩ 7,676
[1]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	The consolidated statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[3]	The consolidated statements of changes in equity for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Equity $ in Thousands, ₩ in Millions		KRW (₩)		USD ($)		Share capitalKRW (₩)		Share capitalUSD ($)	Hybrid InstrumentKRW (₩)		Hybrid InstrumentUSD ($)	Capital surplusKRW (₩)		Capital surplusUSD ($)	Accumulated other comprehensive incomeKRW (₩)		Accumulated other comprehensive incomeUSD ($)	Retained earningsKRW (₩)		Retained earningsUSD ($)	Treasury sharesKRW (₩)		Treasury sharesUSD ($)	Non-controlling interestsKRW (₩)		Non-controlling interestsUSD ($)
Balance at beginning at Dec. 31, 2017	[1]	₩ 34,044,829				₩ 2,090,558						₩ 17,122,228			₩ 537,668			₩ 15,044,204			₩ (755,973)			₩ 6,144
Comprehensive income
Profit for the year	[1]	3,061,946	[2],[3]			0						0			0			3,061,191			0			755
Remeasurements of net defined benefit liabilities	[1]	(138,016)	[3]			0						0			(138,016)			0			0			0
Exchange differences on translating foreign operations	[1]	48,820	[3]			0						0			48,916			0			0			(96)
Valuation gains on financial investments	[1]	0
Net gains (losses) on financial instruments at fair value through other comprehensive income	[1]	103,511				0						0			88,013			15,498			0			0
Share of other comprehensive income (losses) of associates and joint ventures	[1]	(3,733)				0						0			(3,733)			0			0			0
Losses on cash flow hedging instruments	[1]	(9,038)	[3]			0						0			(9,038)			0			0			0
Gains (losses) on hedging instruments of net investments in foreign operations	[1]	(27,134)	[3]			0						0			(27,134)			0			0			0
Other comprehensive income arising from separate account	[1]	28,709				0						0			28,709			0			0			0
Fair value changes on financial liabilities designated at fair value due to own credit risk	[1]	1,484	[3]			0						0			1,484			0			0			0
Net gains on overlay approach adjustment	[1]	413	[3]			0						0			413			0			0			0
Total comprehensive income(loss)	[1]	3,066,962				0						0			(10,386)			3,076,689			0			659
Transactions with shareholders
Annual dividends paid to shareholders of the parent company	[1]	(766,728)				0						0			0			(766,728)			0			0
Acquisition and retirement of treasury shares	[1]	(212,576)				0						0			0			0			(212,576)			0
Non-controlling interests changes in business combination	[1]	2,238				0						0			0			0			0			2,238
Others	[1]	(498)				0						(568)			0			0			0			70
Total transactions with shareholders	[1]	(977,564)				0						(568)			0			(766,728)			(212,576)			2,308
Balance at ending at Dec. 31, 2018	[1]	35,713,027				2,090,558			₩ 0			17,121,660			177,806			17,282,441			(968,549)			9,111
The effect of changing of accounting policy	[1]	(421,200)				0						0			(349,476)			(71,724)			0			0
Balance after reflecting the effect of accounting policy	[1]	33,623,629				2,090,558						17,122,228			188,192			14,972,480			(755,973)			6,144
Comprehensive income
Profit for the year		3,313,199	[1],[2],[3]			0	[1]		0	[1]		0			0	[1]		3,311,828	[1]		0	[1]		1,371	[1]
Remeasurements of net defined benefit liabilities	[1]	(55,827)	[3]			0			0			0			(55,827)			0			0			0
Exchange differences on translating foreign operations	[1]	37,861	[3]			0			0			0			37,577			0			0			284
Net gains (losses) on financial instruments at fair value through other comprehensive income	[1]	18,162				0			0			0			36,637			(18,475)			0			0
Share of other comprehensive income (losses) of associates and joint ventures	[1]	7,695				0			0			0			7,695			0			0			0
Losses on cash flow hedging instruments	[1]	(33,182)	[3]			0			0			0			(33,182)			0			0			0
Gains (losses) on hedging instruments of net investments in foreign operations	[1]	(8,900)	[3]			0			0			0			(8,900)			0			0			0
Other comprehensive income arising from separate account	[1]	3,364				0			0			0			3,364			0			0			0
Fair value changes on financial liabilities designated at fair value due to own credit risk	[1]	(11,372)	[3]			0			0			0			(11,372)			0			0			0
Net gains on overlay approach adjustment	[1]	194,223	[3]			0			0			0			194,223			0			0			0
Total comprehensive income(loss)	[1]	3,465,223				0			0			0			170,215			3,293,353			0			1,655
Transactions with shareholders
Annual dividends paid to shareholders of the parent company	[1]	(759,736)				0			0			0			0			(759,736)			0			0
Issuance of hybrid securities	[1]	973,785				0			399,205			0			0			0			0			574,580
Dividends on hybrid securities	[1]	(6,513)				0			0			0			0			(6,513)			0			0
Acquisition and retirement of treasury shares	[1]	(267,639)				0			0			0			0			(100,000)			(167,639)			0
Others	[1]	1,178				0			0			1,117			0			0			0			61
Total transactions with shareholders	[1]	(58,925)				0			399,205			1,117			0			(866,249)			(167,639)			574,641
Balance at ending at Dec. 31, 2019		39,119,325	[1]	$ 36,017,830		2,090,558	[1]	$ 1,924,812	399,205	[1]	$ 367,555	17,122,777	[1]	$ 15,765,233	348,021	[1]	$ 320,429	19,709,545	[1]	$ 18,146,914	(1,136,188)	[1]	$ (1,046,108)	585,407	[1]	$ 538,995
Comprehensive income
Profit for the year	[1]	3,502,281	[2],[3]	3,224,610	[2],[3]	0		0	0		0	0		0	0		0	3,455,151		3,181,217	0		0	47,130		43,393
Remeasurements of net defined benefit liabilities	[1]	(10,385)	[3]	(9,561)	[3]	0		0	0		0	0		0	(10,096)		(9,296)	0		0	0		0	(289)		(265)
Exchange differences on translating foreign operations	[1]	(187,283)	[3]	(172,435)	[3]	0		0	0		0	0		0	(162,906)		(149,991)	0		0	0		0	(24,377)		(22,444)
Net gains (losses) on financial instruments at fair value through other comprehensive income	[1]	465,568		428,657		0		0	0		0	0		0	229,899		211,672	236,648		217,886	0		0	(979)		(901)
Share of other comprehensive income (losses) of associates and joint ventures	[1]	(6,847)		(6,304)		0		0	0		0	0		0	(6,847)		(6,304)	0		0	0		0	0		0
Losses on cash flow hedging instruments	[1]	(1,264)	[3]	(1,164)	[3]	0		0	0		0	0		0	(1,264)		(1,164)	0		0	0		0	0		0
Gains (losses) on hedging instruments of net investments in foreign operations	[1]	64,269	[3]	59,174	[3]	0		0	0		0	0		0	64,269		59,174	0		0	0		0	0		0
Other comprehensive income arising from separate account	[1]	(9,683)		(8,915)		0		0	0		0	0		0	(9,683)		(8,915)	0		0	0		0	0		0
Fair value changes on financial liabilities designated at fair value due to own credit risk	[1]	8,819	[3]	8,120	[3]	0		0	0		0	0		0	8,819		8,120	0		0	0		0	0		0
Net gains on overlay approach adjustment	[1]	152,125	[3]	140,064	[3]	0		0	0		0	0		0	152,125		140,064	0		0	0		0	0		0
Total comprehensive income(loss)	[1]	3,977,600		3,662,246		0		0	0		0	0		0	264,316		243,360	3,691,799		3,399,102	0		0	21,485		19,784
Transactions with shareholders
Annual dividends paid to shareholders of the parent company	[1]	(861,092)		(792,822)		0		0	0		0	0		0	0		0	(861,092)		(792,822)	0		0	0		0
Issuance of hybrid securities	[1]	1,296,783		1,193,970		0		0	1,296,783		1,193,970	0		0	0		0	0		0	0		0	0		0
Dividends on hybrid securities	[1]	(48,518)		(44,671)		0		0	0		0	0		0	0		0	(22,860)		(21,047)	0		0	(25,658)		(23,624)
Non-controlling interests changes in business combination	[1]	247,008		227,424		0		0	0		0	0		0	0		0	0		0	0		0	247,008		227,424
Others	[1]	(369,647)		(340,342)		0		0	0		0	(399,188)		(367,540)	0		0	0		0	0		0	29,541		27,198
Total transactions with shareholders	[1]	264,534		243,559		0		0	1,296,783		1,193,970	(399,188)		(367,540)	0		0	(883,952)		(813,869)	0		0	250,891		230,998
Balance at ending at Dec. 31, 2020	[1]	₩ 43,361,459		$ 39,923,635		₩ 2,090,558		$ 1,924,812	₩ 1,695,988		$ 1,561,525	₩ 16,723,589		$ 15,397,693	₩ 612,337		$ 563,789	₩ 22,517,392		$ 20,732,148	₩ (1,136,188)		$ (1,046,108)	₩ 857,783		$ 789,776
[1]	The consolidated statements of changes in equity for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	The consolidated statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[3]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Cash Flows

Cash Flows $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Cash flows from operating activities
Profit for the year	[1],[2],[3]	₩ 3,502,281	$ 3,224,610	₩ 3,313,199	₩ 3,061,946
Adjustment for non-cash items
Net gains on financial assets/liabilities at fair value through profit or loss	[1]	(566,447)	(521,538)	(438,567)	(104,755)
Net losses(gains) on derivative financial instruments for hedging purposes	[1]	(52,696)	(48,519)	(3,835)	186,029
Adjustment of fair value of derivative financial instruments	[1]	(3,198)	(2,945)	282	410
Provision for credit loss	[1],[3]	1,043,498	960,767	670,185	673,694
Net losses(gains) on financial investments	[1]	(278,805)	(256,702)	(206,192)	(99,253)
Share of profit of associates and joint ventures	[1],[3]	43,750	40,281	(16,451)	(24,260)
Depreciation and amortization expense	[1]	874,911	805,545	784,431	409,481
Depreciation and amortization expense on VOBA	[1]	173,866	160,082	192,459	214,153
Other net losses (gains) on property and equipment/intangible assets	[1]	(124,218)	(114,369)	(33,238)	(138,553)
Share-based payments	[1]	49,364	45,450	49,418	10,930
Policy reserve appropriation	[1]	2,709,818	2,494,976	1,546,271	1,608,175
Post-employment benefits	[1]	235,231	216,581	231,913	220,215
Net interest expense	[1]	458,210	421,883	313,550	277,152
Net losses (gains) on foreign currency translation	[1]	(116,786)	(107,526)	(74,488)	(142,586)
Gains on bargain purchase	[1]	(145,067)	(133,566)	0	0
Net other expense	[1]	524,742	483,141	390,074	207,025
Adjustment for non-cash items (Sub-total)	[1]	4,826,173	4,443,541	3,405,812	3,297,857
Changes in operating assets and liabilities
Financial asset at fair value through profit or loss	[1]	(7,139,647)	(6,573,595)	(916,415)	(8,446,927)
Derivative financial instruments	[1]	(38,376)	(35,333)	(644,342)	151,297
Loans at fair value through other comprehensive income	[1]	81,803	75,318	15,536	(40,413)
Loans at amortized cost	[1]	(31,126,636)	(28,658,825)	(21,681,258)	(31,334,606)
Current income tax assets	[1]	(54,539)	(50,215)	(9,091)	(3,668)
Deferred income tax assets	[1]	(15,108)	(13,910)	803	(557)
Other assets	[1]	(9,126,046)	(8,402,507)	(3,668,385)	(2,292,160)
Financial liabilities at fair value through profit or loss	[1]	(3,247,108)	(2,989,668)	(77,231)	3,690,005
Deposits	[1]	27,381,662	25,210,763	28,480,993	20,679,844
Current income tax liabilities	[1]	323,313	297,679	(266,204)	264,765
Deferred income tax liabilities	[1]	(125,066)	(115,150)	235,209	115,208
Other liabilities	[1]	3,216,600	2,961,577	1,212,080	1,899,791
Changes in operating assets and liabilities (Sub-total)	[1]	(19,869,148)	(18,293,866)	2,681,695	(15,317,421)
Net cash inflow (outflow) from operating activities	[1]	(11,540,694)	(10,625,715)	9,400,706	(8,957,618)
Cash flows from investing activities
Net cash flows from derivative financial instruments for hedging purposes	[1]	(64,177)	(59,089)	(206,680)	42,305
Disposal of financial asset at fair value through profit or loss	[1]	14,169,758	13,046,338	11,364,615	9,582,940
Acquisition of financial asset at fair value through profit or loss	[1]	(13,923,371)	(12,819,485)	(12,359,886)	(8,707,420)
Disposal of financial investments	[1]	83,143,443	76,551,586	69,489,132	60,773,660
Acquisition of financial investments	[1]	(92,206,817)	(84,896,389)	(79,083,472)	(64,729,380)
Disposal of investments in associates and joint ventures	[1]	210,266	193,595	26,185	34,717
Acquisition of investments in associates and joint ventures	[1]	(515,342)	(474,484)	(92,200)	(187,077)
Disposal of property and equipment	[1]	6,465	5,952	12,786	2,272
Acquisition of property and equipment	[1]	(424,862)	(391,178)	(608,736)	(452,270)
Disposal of investment property	[1]	646,263	595,025	94,207	140,969
Acquisition of investment property	[1]	(53,196)	(48,978)	(806,088)	(1,288,125)
Disposal of intangible assets	[1]	14,303	13,169	14,694	10,706
Acquisition of intangible assets	[1]	(182,859)	(168,361)	(333,557)	(126,163)
Net cash flows from the change in subsidiaries	[1]	(1,951,245)	(1,796,545)
Net cash flows from the change in subsidiaries	[1]			91,592	188,140
Others	[1]	142,961	131,627	62,984	234,440
Net cash outflow from investing activities	[1]	(10,988,410)	(10,117,217)	(12,334,424)	(4,480,286)
Cash flows from financing activities
Net cash flows from derivative financial instruments for hedging purposes	[1]	(16,202)	(14,918)	(28,631)	15,044
Net increase in borrowings	[1]	10,683,659	9,836,627	5,027,313	4,216,014
Increase in debentures	[1]	119,705,016	110,214,450	93,655,747	143,603,589
Decrease in debentures	[1]	(107,760,800)	(99,217,206)	(96,145,669)	(135,180,630)
Increase (decrease) in other payables from trust accounts	[1]	2,326,495	2,142,043	(68,648)	267,077
Dividends paid to shareholders of the parent company	[1]	(861,092)	(792,822)	(759,736)	(766,728)
Dividends paid on hybrid securities	[1]	(22,860)	(21,047)	(6,513)	0
Acquisition of treasury shares	[1]	0	0	(274,317)	(224,700)
Decrease (increase) in non-controlling interests	[1]	(25,658)	(23,624)	574,580	0
Issuance of hybrid securities	[1]	1,296,783	1,193,970	399,205	0
Redemption of principal elements of lease payments	[1]	(235,498)	(216,827)	(229,750)	0
Others	[1]	172,433	158,762	134,027	(185,894)
Net cash inflow from financing activities	[1]	25,262,276	23,259,408	2,277,608	11,743,772
Effect of exchange rate changes on cash and cash equivalents	[1]	(171,805)	(158,184)	137,019	(67,950)
Net increase (decrease) in cash and cash equivalents	[1]	2,561,367	2,358,292	(519,091)	(1,762,082)
Cash and cash equivalents at the beginning of the year	[1]	6,123,725	5,638,218	6,642,816	8,404,898
Cash and cash equivalents at the end of the year	[1]	₩ 8,685,092	$ 7,996,510	₩ 6,123,725	₩ 6,642,816
[1]	The consolidated statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	The consolidated statements of changes in equity for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[3]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

The Parent Company

The Parent Company	12 Months Ended
	Dec. 31, 2020
Entity Information Abstract [Abstract]
Disclosure Of Notes And Other Explanatory Information Explanatory	1. The Parent Company KB Financial Group Inc. (the “Parent Company”) was incorporated on September 29, 2008, under the Financial Holding Companies Act of Korea. KB Financial Group Inc. and its subsidiaries (the “Group”) derive substantially all of their revenue and income from providing a broad range of banking and related financial services to consumers and corporations primarily in Korea and in selected international markets. The Parent Company’s principal business includes ownership and management of subsidiaries and associated companies that are engaged in financial services or activities. In 2011, Kookmin Bank spun off its credit card business segment and established a new separate credit card company, KB Kookmin Card Co., Ltd. and KB Investment & Securities Co., Ltd. merged with KB Futures Co., Ltd. The Group established KB Savings Bank Co., Ltd. in January 2012, acquired Yehansoul Savings Bank Co., Ltd. in September 2013, and KB Savings Bank Co., Ltd. merged with Yehansoul Savings Bank Co., Ltd. in January 2014. In March 2014, the Group acquired Woori Financial Co., Ltd. and changed the name to KB Capital Co., Ltd. Meanwhile, the Group included LIG Insurance Co., Ltd. as an associate and changed the name to KB Insurance Co., Ltd. in June 2015, and KB Insurance Co., Ltd. became one of the subsidiaries through a tender offer in May 2017. Also, the Group included Hyundai Securities Co., Ltd. as an associate in June 2016 and included as a subsidiary in October 2016 by comprehensive exchange of shares. Hyundai Securities Co., Ltd. merged with KB Investment & Securities Co., Ltd. in December 2016 and changed its name to KB Securities Co., Ltd. in January 2017. In August 2020, the Group acquired Prudential Life Insurance Company of Korea Ltd., which was classified as a subsidiary. The Parent Company’s share capital as of December 31, 2020, is ￦ 2,090,558 million. The Parent Company has been listed on the Korea Exchange (“KRX”) since October 10, 2008, and on the New York Stock Exchange (“NYSE”) for its American Depositary Shares (“ADS”) since September 29, 2008. Number of shares authorized in its Articles of Incorporation is 1,000 million.

Basis of Preparation

Basis of Preparation	12 Months Ended
	Dec. 31, 2020
Basis Of Preparation Of Financial Statements Abstract [Abstract]
Disclosure Of Basis Of Preparation Of Financial Statements Explanatory	2. Basis of Preparation 2.1 Application of IFRS The consolidated financial statements of the Group have been prepared in accordance with International Financial Reporting Standards (“IFRS”). IFRS are the standards, subsequent amendments and related interpretations (“IFRICs”) issued by the International Accounting Standards Board (“IASB”). The preparation of the consolidated financial statements requires the use of certain critical accounting estimates. Management also needs to exercise judgment in applying the Group’s accounting policies. The areas involving a higher degree of judgment or complexity, or areas where assumptions and estimates are significant to the consolidated financial statements are disclosed in Note 2.4. 2.1.1 The Group has applied the following amended standards for the first time for its annual reporting period commencing January 1, 2020. • Amendments to IAS No.1 Presentation of Financial Statements Accounting policies, changes in accounting estimates and errors – Definition of Material The amendments clarify the definition of material. Information is material if omitting, misstating or obscuring it could reasonably be expected to influence the decisions that the primary users of general-purpose financial statements make on the basis of those financial statements. These amendments do not have a significant impact on the consolidated financial statements. • Amendments to IFRS No.3 Business Combination – Definition of a Business The amended definition of a business requires an acquisition to include an input and a substantive process that together significantly contribute to the ability to create outputs and the definition of output excludes the returns in the form of lower costs and other economic benefits. If substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, an entity may elect to apply an optional concentration test that permits a simplified assessment of whether an acquired set of activities and assets is not a business. These amendments do not have a significant impact on the consolidated financial statements. However, these amendments may have impact on the consolidated financial statements if business combination occurs in the future. 2.1.2 The Group has early adopted the following amended standards. • Amendments to IFRS No.7 Financial Instruments: Disclosure Financial Instruments – Interest Rate Benchmark Reform These amendments provide exceptions applying hedge accounting even though interest rate benchmark reform gives rise to uncertainties. In the hedging relationship, an entity shall assume that the interest rate benchmark on which the hedge cash flows are based is not altered as a result of interest rate benchmark reform when determining whether a forecast transaction is highly probable and prospectively assessing hedging effectiveness. For a hedge of a non-contractually The significant benchmark interest rate indicators for the hedge relationship are LIBOR and CD, and those affected by these amendments should be referred to Note 9. 2.1.3 The following new and amended standards have been published that are not mandatory for December 31, 2020 reporting periods and have not been early adopted by the Group. • Amendments to IFRS No.16 Leases – Practical expedient for COVID-19-Related As a practical expedient, a lessee may elect not to assess whether a rent concession occurring as a direct consequence of the COVID-19 • Amendments to IFRS No.9 Financial Instruments Financial Instruments: Recognition and Measurement Financial Instruments: Disclosure Insurance Contracts Lease – Interest Rate Benchmark Reform In relation to interest rate benchmark reform, the amendments provide a practical expedient allowing entities to change the effective interest rate instead of changing the carrying amount and apply hedge accounting without discontinuance although the interest rate benchmark is replaced in hedging relationship. The amendments should be applied for annual periods beginning on or after January 1, 2021, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the consolidated financial statements. • Amendments to IFRS No.3 Business Combination – Reference to the Conceptual Framework The amendments update a reference of definition of assets and liabilities to qualify for recognition in revised Conceptual Framework for Financial Reporting. However, the amendments add an exception for the recognition of liabilities and contingent liabilities within the scope of IAS No.37 Provisions, Contingent Liabilities and Contingent Assets Levies • Amendments to IAS No.16 Property, Plant and Equipment – Proceeds before intended use The amendments prohibit an entity from deducting from the cost of an item of property, plant and equipment any proceeds from selling items produced while the entity is preparing the asset for its intended use. Instead, the entity will recognize the proceeds from selling such items, and the costs of producing those items, as profit or loss. The amendments should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the consolidated financial statements. • Amendments to IAS No.37 Provisions, Contingent Liabilities and Contingent Assets – Onerous Contracts: Cost of Fulfilling a Contract The amendments clarify that the direct costs of fulfilling a contract include both the incremental costs of fulfilling the contract and an allocation of other costs directly related to fulfilling contracts when assessing whether the contract is onerous. The amendments should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the consolidated financial statements. • Annual improvements to IFRS 2018-2020 Annual improvements of IFRS 2018-2020 Cycle should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the consolidated financial statements. • IFRS No.1 First time Adoption of International Financial Reporting Standards • IFRS No.9 Financial Instruments • IFRS No.16 Leases • IAS No.41 Agricultur • Amendments to IAS No.1 Presentation of Financial Statements – Classification of Liabilities as Current or Non-current The amendments clarify that liabilities are classified as either current or non-current, • IFRS No.17 Insurance Contracts IFRS No.17 Insurance Contracts 2.2 Measurement Basis The consolidated financial statements have been prepared based on the historical cost accounting model unless otherwise specified. 2.3 Functional and Presentation Currency Items included in the financial statements of each entity of the Group are measured using the currency of the primary economic environment in which the entity operates (“functional currency”). The consolidated financial statements are presented in Korean won, which is the Parent Company’s functional and presentation currency. 2.4 Critical Accounting Estimates The preparation of the consolidated financial statements requires the application of accounting policies, certain critical accounting estimates and assumptions that may have a significant impact on the assets (liabilities) and incomes (expenses). Management’s estimates of outcomes may differ from actual outcomes if management’s estimates and assumptions based on management’s best judgment at the reporting date are different from the actual environment. Estimates and underlying assumptions are continually evaluated, and changes in accounting estimates are recognized in the period in which the estimates are changed and in any future periods affected. Uncertainties in estimates and assumptions with significant risks that may result in material adjustments to the consolidated financial statements are as follows: 2.4.1 Income taxes The Group is operating in numerous countries and the income generated from these operations is subject to income taxes based on tax laws and interpretations of tax authorities in numerous jurisdictions. There are many transactions and calculations for which the ultimate tax determination is uncertain. If certain portion of the taxable income is not used for investments, wages, etc. in accordance with the Korean regulation called ‘Special Taxation for Facilitation of Investment and Mutually-beneficial Cooperation’, the Group is liable to pay additional income tax calculated based on the tax laws. Therefore, the effect of recirculation of corporate income should be reflected in current and deferred income tax. As the Group’s income tax is dependent on the actual investments, wages, etc. per each year, there are uncertainties with regard to measuring the final tax effects during the period when the tax law is applied. 2.4.2 Fair value of financial instruments The fair value of financial instruments where no active market exists or where quoted prices are not otherwise available is determined by using valuation techniques. Financial instruments, which are not actively traded in the market and those with less transparent market prices, will have less objective fair values and require broad judgment on liquidity, concentration, uncertainty in market factors and assumptions in fair value determination and other risks. As described in the significant accounting policies in Note 3.3, ‘Recognition and Measurement of Financial Instruments’, diverse valuation techniques are used to determine the fair value of financial instruments, from generally accepted market valuation models to internally developed valuation models that incorporate various types of assumptions and variables. 2.4.3 Allowances and provisions for credit losses The Group recognizes and measures allowances for credit losses of debt instruments measured at amortized cost, debt instruments measured at fair value through other comprehensive income, and lease receivables. Also, the Group recognizes and measures provisions for credit losses of acceptances and guarantees, and unused loan commitments. Accuracy of allowances and provisions for credit losses is dependent upon estimation of expected cash flows of the borrower for individually assessed loans, and upon assumptions and methodology used for collectively assessed groups of loans, acceptances and guarantees and unused loan commitments. 2.4.4 Net defined benefit liability The present value of the net defined benefit liability is affected by changes in the various factors determined by the actuarial method. 2.4.5 Impairment of goodwill The recoverable amounts of cash-generating units are determined based on value-in-use 2.4.6 Estimated claims for Incurred But Not Reported (“IBNR”) An amount of IBNR is the total sum of estimated insurance claims that shall be paid for accidents that occurred but have not been reported to the Group and the estimated amount of insurance proceeds that shall be additionally paid upon resumption of payment claims. The Group calculates IBNR by applying statistical methods in risk units designated in Detailed Regulations on Supervision of Insurance Business, and records IBNR in reserve for outstanding claims of insurance liability. IBNR based on statistical methods requires significant accounting estimates in determining appropriate model applied by accident year (PLDM, ILDM, BFM, and others) and development parameters. 2.4.7 Assessment of expected credit losses of financial instruments related to COVID-19 The proliferation of COVID-19 COVID-19 COVID-19, (non-impaired) COVID-19

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies Abstract [Abstract]
Disclosure Of Summary Of Significant Accounting Policies Explanatory	3. Significant Accounting Policies The principal accounting policies applied in the preparation of these consolidated financial statements are set out below. These policies have been consistently applied to all the years presented, unless otherwise stated. For the comparative purpose, certain information in the notes for the year ended December 31, 2019 have been reclassified to conform to the presentation for the year ended December 31, 2020. 3.1 Consolidation 3.1.1 Subsidiaries Subsidiaries are companies that are controlled by the Group. The Group controls an investee when it is exposed, or has rights, to variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Also, the existence and effects of potential voting rights that are currently exercisable or convertible are considered when assessing whether the Group controls the investee. Subsidiaries are fully consolidated from the date when control is transferred to the Group and de-consolidated If a subsidiary uses accounting policies other than those adopted in the consolidated financial statements for like transactions and events in similar circumstances, appropriate adjustments are made to that subsidiary’s financial statements in preparing the consolidated financial statements to ensure conformity with the Group’s accounting policies. Profit or loss and each component of other comprehensive income are attributed to the owners of the Parent Company and to the non-controlling non-controlling non-controlling Transactions with non-controlling non-controlling When the Group loses control, any investment retained in the former subsidiary is recognized at its fair value at the date when control is lost, with the resulting difference recognized in profit or loss. This fair value will be the fair value on initial recognition of a financial asset in accordance with IFRS No.9 or, when appropriate, the cost on initial recognition of an investment in an associate or joint venture. In addition, all amounts previously recognized in other comprehensive income in relation to that subsidiary are accounted on the same basis as would be required if the Group had directly disposed of the related assets or liabilities. Therefore, amounts previously recognized in other comprehensive income are reclassified to profit or loss. The Group accounts for each business combination by applying the acquisition method. The consideration transferred is measured at fair value, and identifiable assets acquired, and liabilities and contingent liabilities assumed in a business combination are initially measured at acquisition-date fair values. For each business combination, the Group measures non-controlling In a business combination achieved in stages, the Group shall remeasure its previously held equity interest in the acquiree at its acquisition-date fair value and recognize the resulting gain or loss, if any, in profit or loss or other comprehensive income, as appropriate. In prior reporting periods, the Group may have recognized changes in the value of its equity interest in the acquiree in other comprehensive income. If so, the amount that was recognized in other comprehensive income shall be reclassified as profit or loss, or retained earnings, on the same basis as would be required if the Group had disposed directly of the previously held equity interest. The Group applies the book amount method to account for business combinations of entities under a common control. Identifiable assets acquired and liabilities assumed in a business combination are measured at their book amounts on the consolidated financial statements of the Group. In addition, the difference between (a) the sum of consolidated net book amounts of the assets and liabilities transferred and accumulated other comprehensive income and (b) the consideration paid is recognized as capital surplus. 3.1.2 Associates and joint ventures Associates are entities over which the Group has significant influence over the financial and operating policy decisions. Generally, if the Group holds 20% or more of the voting power of the investee, it is presumed that the Group has significant influence. Joint ventures are investments in which the Group jointly controls over economic activities pursuant to contractual arrangement. Decisions about financial and operating policies require unanimous consent of the parties sharing control. Investments in associates and joint ventures are initially recognized at cost and equity method is applied after initial recognition. The carrying amount is increased or decreased to recognize the Group’s share of the profit or loss of the investee and changes in the investee’s equity after the date of acquisition. Distributions received from an investee reduce the carrying amount of the investment. Unrealized gains and losses resulting from transactions between the Group and associates are eliminated to the extent of the Group’s share in associates. If unrealized losses are indication of an impairment loss that which should be recognized in the consolidated financial statements, those losses are recognized for the period. If associates and joint ventures use accounting policies other than those of the Group for like transactions and events in similar circumstances, if necessary, adjustments shall be made to make the associates’ accounting policies conform to those of the Group when the associates’ financial statements are used by the Group in applying the equity method. If the Group’s share of losses of associates and joint ventures equals or exceeds its interest in the associates (including long-term interests that, in substance, form part of the Group’s net investment in the associate), the Group discontinues recognizing its share of further losses. After the Group’s interest is reduced to zero, additional losses are provided for, and a liability is recognized, only to the extent that the Group has incurred legal or constructive obligations or made payments on behalf of the associates. The Group determines at each reporting period whether there is any objective evidence that the investments in the associates are impaired. If this is the case, the Group calculates the amount of impairment as the difference between the recoverable amount of the associates and its carrying value and recognizes the amount as non-operating 3.1.3 Structured entity A structured entity is an entity that has been designed so that voting or similar rights are not the dominant factor in deciding who controls the entity. When the Group decides whether it has power over the structured entities in which the Group has interests, it considers factors such as the purpose, the form, the substantive ability to direct the relevant activities of a structured entity, the nature of its relationship with a structured entity and the amount of exposure to variable returns. 3.1.4 Funds management The Group manages and operates trust assets, collective investment and other funds on behalf of investors. These trusts and funds are not consolidated, except for trusts and funds over which the Group has control. 3.1.5 Intragroup transactions Intragroup balances, income, expenses and any unrealized gains and losses resulting from intragroup transactions are eliminated in full, in preparing the consolidated financial statements. If unrealized losses are indication of an impairment loss which should be recognized in the consolidated financial statements, those losses are recognized for the period. 3.2 Foreign Currency 3.2.1 Foreign currency transactions A foreign currency transaction is recorded, at initial recognition in the functional currency, by applying to the foreign currency amount the spot exchange rate between the functional currency and the foreign currency at the date of the transaction. At the end of each reporting period, foreign currency monetary items are translated using the closing rate which is the spot exchange rate at the end of the reporting period. Non-monetary non-monetary Except for the exchange difference for the net investment in a foreign operation and the financial liability designated as a hedging instrument of net investment, exchange differences arising on the settlement of monetary items or on translating monetary items is recognized in profit or loss. When gain or loss on a non-monetary non-monetary 3.2.2 Foreign operations The results and financial position of a foreign operation, whose functional currency differs from the Group’s presentation currency, are translated into the Group’s presentation currency based on the following procedures. If the functional currency of a foreign operation is not the currency of a hyperinflationary economy, assets and liabilities for each statement of financial position presented (including comparatives) are translated at the closing rate at the end of the reporting period, income and expenses for each statement of comprehensive income presented (including comparatives) are translated using the average exchange rates for the period. All resulting exchange differences are recognized in other comprehensive income. Any goodwill arising on the acquisition of a foreign operation and any fair value adjustments to the carrying amounts of assets and liabilities arising on the acquisition of that foreign operation are treated as assets and liabilities of the foreign operation. Thus, they are expressed in the functional currency of the foreign operation and are translated into the presentation currency at the closing rate. On the disposal of a foreign operation, the cumulative amount of the exchange differences relating to that foreign operation, recognized in other comprehensive income and accumulated in the separate component of equity, is reclassified from equity to profit or loss (as a reclassification adjustment) when the gain or loss on disposal is recognized. On the partial disposal of a subsidiary that includes a foreign operation, the Group re-attributes non-controlling 3.2.3 Translation of the net investment in a foreign operation A monetary item that is receivable from or payable to a foreign operation, for which settlement is neither planned nor likely to occur in the foreseeable future is, in substance, a part of the Group’s net investment in that foreign operation, then foreign currency difference arising from that monetary item is recognized in the other comprehensive income and shall be reclassified to profit or loss on disposal of the net investment. 3.3 Recognition and Measurement of Financial Instruments 3.3.1 Initial recognition The Group recognizes a financial asset or a financial liability in its consolidated statement of financial position when the Group becomes party to the contractual provisions of the instrument. A regular way purchase or sale of financial assets (a purchase or sale of a financial asset under a contract whose terms require delivery of the asset within the time frame established generally by regulation or convention in the marketplace concerned) is recognized and derecognized using trade date accounting. For financial reporting purpose, the Group classifies (a) financial assets as financial assets at fair value through profit or loss, financial assets at fair value through other comprehensive income, or financial assets at amortized cost and (b) financial liabilities as financial liabilities at fair value through profit or loss, or other financial liabilities. These classifications are based on business model for managing financial instruments and the contractual cash flow characteristics of the financial instrument at initial recognition. At initial recognition, a financial asset or financial liability is measured at its fair value plus or minus, in the case of a financial asset or financial liability not at fair value through profit or loss, transaction costs that are directly attributable to the acquisition or issue of the financial asset or financial liability. The fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. The fair value of a financial instrument on initial recognition is normally the transaction price (that is, the fair value of the consideration given or received) in an arm’s length transaction. 3.3.2 Subsequent measurement After initial recognition, financial instruments are measured at amortized cost or fair value based on classification at initial recognition. 3.3.2.1 Amortized cost The amortized cost of a financial asset or financial liability is the amount at which the financial asset or financial liability is measured at initial recognition minus the principal repayments, plus or minus the cumulative amortization using the effective interest method of any difference between that initial amount and the maturity amount and, for financial assets, adjusted for any loss allowance. 3.3.2.2 Fair value The Group uses quoted price in active market which is based on listed market price or dealer price quotations of financial instruments traded in active market as best estimate of fair value. A financial instrument is regarded as quoted in an active market if quoted prices are readily and regularly available from an exchange, dealer, broker, industry group, pricing service or regulatory agency, and those prices represent actual and regularly occurring market transactions on an arm’s length basis. If there is no active market for a financial instrument, fair value is determined either by using a valuation technique or independent third-party valuation service. Valuation techniques include using recent arm’s length market transactions between knowledgeable and willing parties, if available, referencing to the current fair value of another instrument that is substantially the same, discounted cash flow analysis and option pricing models. The Group uses valuation models that are commonly used by market participants and customized for the Group to determine fair values of common over-the-counter In addition, the fair value information recognized in the consolidated statement of financial position is classified into the following fair value hierarchy, reflecting the significance of the input variables used in the fair value measurement. Level 1 : Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Group can access at the measurement date Level 2 : Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly Level 3 : Unobservable inputs for the asset or liability The fair value measurement is categorized in its entirety in the same level of the fair value hierarchy as the lowest level input that is significant to the entire measurement. For this purpose, the significance of an input is assessed against the fair value measurement in its entirety. If a fair value measurement uses observable inputs that require significant adjustment using unobservable inputs, that measurement is a Level 3 measurement. If the valuation technique does not reflect all factors which market participants would consider in pricing the asset or liability, the fair value is adjusted to reflect those factors. Those factors include counterparty credit risk, bid-ask The Group uses valuation technique which maximizes the use of market inputs and minimizes the use of entity-specific inputs. It incorporates all factors that market participants would consider in pricing the asset or liability and is consistent with economic methodologies applied for pricing financial instruments. Periodically, the Group calibrates the valuation technique and tests its validity using prices of observable current market transactions of the same instrument or based on other relevant observable market data. 3.3.3 Derecognition Derecognition is the removal of a previously recognized financial asset or financial liability from the consolidated statement of financial position. The derecognition criteria for financial assets and financial liabilities are as follows: 3.3.3.1 Derecognition of financial assets A financial asset is derecognized when the contractual rights to the cash flows from the financial assets expire or the Group transfers substantially all the risks and rewards of ownership of the financial asset, or the Group neither transfers nor retains substantially all the risks and rewards of ownership of the financial asset and the Group has not retained control. Therefore, if the Group does not transfer substantially all the risks and rewards of ownership of the financial asset, the Group continues to recognize the financial asset to the extent of its continuing involvement in the financial asset. If the Group transfers the contractual rights to receive the cash flows of the financial asset but retains substantially all the risks and rewards of ownership of the financial asset, the Group continues to recognize the transferred asset in its entirety and recognize a financial liability for the consideration received. The Group writes off a financial asset when the Group has no reasonable expectations of recovering a financial asset in its entirety or a portion thereof. In general, the Group considers write-off write-off write-off, written-off written-off 3.3.3.2 Derecognition of financial liabilities A financial liability is derecognized from the consolidated statement of financial position when it is extinguished (i.e. the obligation specified in the contract is discharged, canceled or expires). 3.3.4 Offsetting A financial asset and a financial liability is offset and the net amount is presented in the consolidated statement of financial position when, and only when, the Group currently has a legally enforceable right to set off the recognized amounts and intends either to settle on a net basis, or to realize the asset and settle the liability simultaneously. The legally enforceable right must not be contingent on a future event and must be legally enforceable in the normal course of business and in the event of default, insolvency or bankruptcy of the Group and all of the counterparties. 3.4 Cash and Due from Financial Institutions Cash and due from financial institutions include cash on hand, foreign currency, and short-term, highly liquid investments that are readily convertible to known amounts of cash and which are subject to an insignificant risk of changes in value, and due from financial institutions. Cash and due from financial institutions are measured at amortized cost. 3.5 Non-derivative 3.5.1 Financial assets at fair value through profit or loss Financial assets are classified as financial assets at fair value through profit or loss unless they are classified as financial assets at amortized cost or at fair value through other comprehensive income. The Group may designate certain financial assets upon initial recognition as at fair value through profit or loss when the designation eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognizing the gains and losses on them on different bases. After initial recognition, a financial asset at fair value through profit or loss is measured at fair value and gains or losses arising from a change in fair value are recognized in profit or loss. Interest income using the effective interest method and dividend income from financial asset at fair value through profit or loss are also recognized in profit or loss. 3.5.2 Financial assets at fair value through other comprehensive income The Group classifies below financial assets as financial assets at fair value through other comprehensive income; • Debt instruments that are held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets, and where the assets’ cash flows represent solely payments of principal and interest on the principal amount outstanding and; • Equity instruments that are not held for short-term trading but held for strategic investment, and designated as financial assets at fair value through other comprehensive income After initial recognition, a financial asset at fair value through other comprehensive income is measured at fair value. Gains or losses arising from a change in fair value, other than dividend income, interest income calculated using the effective interest method and exchange differences arising on monetary items which are recognized directly in profit or loss, are recognized as other comprehensive income in equity. When the financial assets at fair value through other comprehensive income is disposed, the cumulative gain or loss previously recognized in other comprehensive income is reclassified from equity to profit or loss. However, cumulative gain or loss of equity instrument designated as fair value through other comprehensive income is reclassified to retained earnings not to profit or loss at disposal. A financial asset at fair value through other comprehensive income denominated in foreign currency is translated at the closing rate. Exchange difference resulting from change in amortized cost is recognized in profit or loss, and other changes are recognized in equity. 3.5.3 Financial assets at amortized cost A financial asset, which is held within the business model whose objective is achieved by collecting contractual cash flows, and where the assets’ cash flows represent solely payments of principal and interest on the principal amount outstanding, is classified as a financial asset at amortized cost. After initial recognition, a financial asset at amortized cost is measured at amortized cost using the effective interest method and interest income is calculated using the effective interest method. 3.6 Expected Credit Loss of Financial Assets (Debt Instruments) The Group recognizes a loss allowance for expected credit losses at the end of the reporting period for financial assets at amortized cost and fair value through other comprehensive income except for financial asset at fair value through profit or loss. Expected credit losses are estimated at present value of probability-weighted amount that is determined by evaluating a range of possible outcomes. The Group measures expected credit losses by reflecting all reasonable and supportable information that is available without undue cost or effort at the reporting date about past events, current conditions and forecasts of future economic conditions. The approaches of measuring expected credit losses in accordance with IFRS are as follows: • General approach: for financial assets and unused loan commitments not subject to the below 2 approaches • Simplified approach: for trade receivables, contract assets and lease receivables • Credit-impaired approach: for financial assets that are credit-impaired at the time of acquisition Application of general approach is differentiated depending on whether credit risk has increased significantly after initial recognition. If the credit risk on a financial instrument has not increased significantly since initial recognition, the Group measures the loss allowance for that financial instrument at an amount equal to 12-month The Group assesses whether the credit risk has increased significantly using the following information, and if one or more of the following conditions are met, it is deemed as significant increase in credit risk. Information of more than 30 days overdue is applied to all subsidiaries, and other information is applied selectively considering specific indicators of each subsidiary or additionally considering specific indicators of each subsidiary. If the contractual cash flows on a financial asset have been renegotiated or modified, the Group assesses whether the credit risk has increased significantly using the same following information. • More than 30 days past due • Decline in credit rating at period end by more than certain notches as compared to that at initial recognition • Subsequent managing ratings below certain level in the early warning system • Debt restructuring (except for impaired financial assets) and • Credit delinquency information of Korea Federation of Banks, etc. Under simplified approach, the Group always measures the loss allowance at an amount equal to lifetime expected credit losses. Under credit-impaired approach, the Group only recognizes the cumulative changes in lifetime expected credit losses since initial recognition as a loss allowance for purchased or originated credit-impaired financial assets. In assessing credit impairment, the Group uses definition of default as in the new Basel Accord which rules calculation of Capital Adequacy Ratio. The Group generally considers the loan to be credit-impaired if one or more of the following conditions are met: • 90 days or more past due • Legal proceedings related to collection • A borrower registered on the credit management list of Korea Federation of Banks • A corporate borrower with the credit rating C or D • Refinancing • Debt restructuring, etc. 3.6.1 Forward-looking information The Group uses forward-looking information, when it assesses whether the credit risk has increased significantly and measures the expected credit losses. The Group assumes the risk components have a certain correlation with the economic cycle and uses statistical methodologies to estimate the relation between key macroeconomic variables and risk components for the expected credit losses. The correlation between the major macroeconomic variables and the credit risk are as follows: Key macroeconomic variables Correlation between the major macroeconomic Domestic GDP growth rate (-) Composite stock index (-) Construction investment change rate (-) Rate of change in housing transaction price index (-) Interest rate spread (+) Private consumption growth rate (-) Change of call rate compared to the last year (%p) (+) Household loan change rate (-) Forward-looking information used in calculation of expected credit losses is based on the macroeconomic forecasts utilized by the management of the Group for its business plan considering reliable external agency’s forecasts and others. The forward-looking information is generated by KB Research with comprehensive approach to capture the possibility of various economic forecast scenarios that are derived from the internal and external viewpoints of the macroeconomic situation. The Group determines the macroeconomic variables to be used in forecasting future condition of the economy, considering the direction of the forecast scenario and the significant relationship between macroeconomic variables and time series data. And there are some changes compared to the macroeconomic variables used in the previous year. In order to reflect additional credit risk for financial assets whose industries are highly affected by COVID-19, 3.6.2 Measuring expected credit losses on financial assets at amortized cost The expected credit losses of financial assets at amortized cost are measured as present value of the difference between the contractual cash flows that are due to the Group under the contract and the cash flows that the Group expects to receive. The Group estimates expected future cash flows for financial assets that are individually significant. The Group selects the individually significant financial assets by comprehensively considering quantitative and qualitative factors (such as debt restructuring or negative net assets, etc.) among financial assets with the credit risk has increased significantly or credit-impaired(individual assessment of impairment). For financial assets that are not individually significant, the Group collectively estimates expected credit loss by grouping loans with homogeneous credit risk profile (collective assessment of impairment). 3.6.2.1 Individual assessment of impairment Individual assessment of impairment losses is calculated using management’s best estimate on present value of expected future cash flows. The Group uses all the available information including financial condition of the borrower such as operating cash flow and net realizable value of any collateral held. 3.6.2.2 Collective assessment of impairment Collective assessment of impairment losses is performed by using a methodology based on historical loss experience and reflecting forward-looking information. Such process incorporates factors such as type of collateral, product and borrowers, credit rating, size of portfolio and recovery period and applies Probability of Default (“PD”) on a group of assets and Loss Given Default (“LGD”) by type of recovery method. Also, the expected credit loss model involves certain assumptions to determine input based on loss experience and forward-looking information. These models and assumptions are periodically reviewed to reduce gap between loss estimate and actual loss experience. The lifetime expected credit loss is measured by applying the PD to the carrying amount calculated by deducting the expected principal repayment amount from the carrying amount as of the reporting date and the LGD adjusted to reflect changes in the carrying amount. 3.6.3 Measuring expected credit losses on financial assets at fair value through other comprehensive income The Group measures expected credit losses on financial assets at fair value through other comprehensive income in a manner that is consistent with the requirements that are applicable to financial assets measured at amortized cost. However, the loss allowance is recognized in other comprehensive income. Upon disposal or repayment of financial assets at fair value through other comprehensive income, the amount of the loss allowance is reclassified from other comprehensive income to profit or loss. 3.7 Derivative Financial Instruments The Group enters into numerous derivative financial instrument contracts such as currency forwards, interest rate swaps, currency swaps and others for trading purposes or to manage its exposures to fluctuations in interest rates and currency exchange, amongst others. The Group’s derivative operations focus on addressing the needs of the Group’s corporate clients to hedge their risk exposure and to hedge the Group’s risk exposure that results from such client contracts. These derivative financial instruments are presented as derivative financial instruments in the consolidated financial statements irrespective of transaction purpose and subsequent measurement requirement. The Group designates certain derivatives as hedging instruments to hedge the risk of changes in fair value of a recognized asset or liability or of an unrecognized firm commitment (fair value hedge) and the risk of changes in cash flow (cash flow hedge). The Group designates certain derivatives and non-derivatives At the inception of the hedging relationship, there is formal designation and documentation of the hedging relationship and the Group’s risk management objective and strategy for undertaking the hedge. This documentation includes identification of the hedging instrument, the hedged item, the nature of the risk being hedged, the inception date of hedging relationship and how the Group will assess the hedging instrument’s effectiveness in offsetting the exposure to changes in the hedged item’s fair value or cash flows attributable to the hedged risk. Derivatives are initially recognized at fair value. After initial recognition, derivatives are measured at fair value, and changes therein are accounted for as described below. 3.7.1 Derivative financial instruments held for trading All derivative financial instruments, except for derivatives that are designated and qualify for hedge accounting, are measured at fair value. Gains or losses arising from changes in fair value are recognized in profit or loss as part of net gains or losses on financial instruments at fair value through profit or loss. 3.7.2 Derivative financial instruments for fair value hedges If derivatives are designated and qualify for a fair value hedge, changes in fair value of the hedging instrument and changes in fair value of the hedged item attributable to the hedged risk are recognized in profit or loss as part of other operating income and expenses. If the hedged items are equity instruments for which the Group has elected to present changes in fair value in other comprehensive income, changes in fair value of the hedging instrument and changes in fair value of the hedged item attributable to the hedged risk are recognized in other comprehen

Financial Risk Management

Financial Risk Management	12 Months Ended
	Dec. 31, 2020
Finacial Risk Management Abstract [Abstract]
Disclosure Of Financial Risk Management Explanatory	4. Financial Risk Management 4.1 Summary 4.1.1 Overview of financial risk management policy The financial risks that the Group is exposed to are credit risk, market risk, liquidity risk, operational risk and others. This note regarding financial risk management provides information about the risks that the Group is exposed to and about its objectives, policies, risk assessment and management procedures, and capital management. Additional quantitative information is disclosed throughout the consolidated financial statements. The Group’s risk management system focuses on efficiently supporting long-term strategy and management decisions through increased risk transparency, spread of risk management culture and preemptive response to rapidly changing financial environments. Credit risk, market risk, liquidity risk, and operational risk are recognized as the Group’s significant risks and measured and managed by quantifying them in the form of Internal Capital or Value at Risk (“VaR”) using statistical methods. 4.1.2 Risk management organization 4.1.2.1 Risk Management Committee The Risk Management Committee, as the ultimate decision-making body, deals with risk-related issues, such as establishing risk management strategies in accordance with the strategic direction determined by the Board of Directors, determining the affordable level of risk appetite, reviewing the level of risk and the status of risk management activities, approving the application of risk management systems, methodologies, and major improvements, and establishing and approving risk management policies and procedures to timely recognize, measure, monitor, and control risks arising from various transactions by the Group. 4.1.2.2 Risk Management Council The Risk Management Council is responsible for consulting on matters delegated by the Risk Management Committee and requests for review by the Management Executive Committee, consulting on details of each subsidiary’s risk management policies and procedures, monitoring the Group’s risk management status, and establishing and implementing necessary measures. 4.1.2.3 Risk Management Department The Risk Management Department manages risk management policies, procedures, and business processes. 4.2 Credit Risk 4.2.1 Overview of credit risk Credit risk is the risk of loss from the portfolio of assets held due to the counterparty’s default, breach of contract and deterioration of credit quality. For risk management reporting purposes, the Group considers all factors of credit risk exposure, such as default risk of individual borrowers, country risk and risk of specific sectors. The Group defines default as the definition applied to the calculation of Capital Adequacy Ratio under the new Basel Accord (Basel III). 4.2.2 Credit risk management The Group measures the expected loss and economic capital for the assets subject to credit risk management, including on-balance off-balance In addition, to prevent excessive concentration of exposures by borrower and industry, the total exposure limit at the Group level is introduced, applied, and managed to control the credit concentration risk. All of the Kookmin Bank’s loan customers (individuals and corporates) are assigned with credit rating and managed by a comprehensive internal credit evaluation system. For individuals, the credit rating takes into account the personal information, income and job information, asset information, and bank transaction information. For corporates, the credit rating is evaluated by analyzing and utilizing financial and non-financial The credit rating, once assigned, serves as the fundamental instrument in Kookmin Bank’s credit risk management, and is applied in a wide range of credit risk management processes, including credit approval, credit limit management, loan pricing and computation of allowance for credit loss. For corporates, Kookmin Bank conducts a regular credit evaluation at least once a year, and the review and supervision departments regularly validate the adequacy of credit ratings to manage credit risks. KB Kookmin Card Co., Ltd.’s credit scoring system is divided into Application Scoring System (“ASS”) and Behavior Scoring System (“BSS”). For applications that meet the eligibility criteria for card issuance, the card will be issued only if the ASS credit rating is above the standard. KB Kookmin Card Co., Ltd.’s internal information, a credit bureau company’s external information and personal information on the application are used to calculate the ASS credit rating. The BSS, which is recalculated on a weekly basis, predicts the delinquency probability of cardholders, and utilizes it to monitor cardholders and portfolio risk. In order to establish a credit risk management system, the Group manages credit risk by forming a separate risk management organization. In particular, independent of the Sales Group, the Credit Analysis Group of Kookmin Bank, a subsidiary, is in charge of loan policy, loan system, credit rating, credit analysis, follow-up 4.2.3 Maximum exposure to credit risk The Group’s maximum exposures of financial instruments other than equity securities, to credit risk without consideration of collateral values as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Financial assets Due from financial institutions measured at amortized cost * ￦ 18,142,960 ￦ 22,720,091 Financial assets at fair value through profit or loss Due from financial institutions measured at fair value through profit or loss 216,367 100,094 Securities measured at fair value through profit or loss 50,721,526 58,415,100 Loans measured at fair value through profit or loss 427,545 337,983 Financial instruments indexed to the price of gold 79,805 89,965 Derivatives 3,190,673 5,545,385 Loans measured at amortized cost * 339,684,059 377,166,984 Financial investments Securities measured at fair value through other comprehensive income 43,556,848 58,456,889 Securities measured at amortized cost * 25,346,555 36,870,229 Loans measured at fair value through other comprehensive income 375,098 293,409 Other financial assets * 9,147,059 14,167,689 490,888,495 574,163,818 Off-balance Acceptances and guarantees contracts 8,327,494 8,548,928 Financial guarantee contracts 3,847,390 4,964,468 Commitments 151,797,615 159,133,983 163,972,499 172,647,379 ￦ 654,860,994 ￦ 746,811,197 * After netting of allowance. 4.2.4 Credit risk of loans The Group maintains an allowance for loan losses associated with credit risk of loans to manage its credit risk. The Group assesses expected credit losses and recognizes loss allowances of financial assets at amortized cost and financial assets at fair value through other comprehensive income. Financial assets at fair value through profit or loss are excluded. Expected credit losses are a probability-weighted estimate of possible credit losses occurred in a certain range by reflecting reasonable and supportable information that is reasonably available at the reporting date without undue cost or effort, including information about past events, current conditions and forecasts of future economic conditions. The Group measures the expected credit losses of loans classified as financial assets measured at amortized cost, by deducting allowances for credit losses. The expected credit losses of loans classified as financial assets at fair value through other comprehensive income are presented in other comprehensive income in the consolidated financial statements. 4.2.4.1 Credit risk exposure Credit qualities of loans as of December 31, 2019 and 2020, are as follows: December 31, 2019 12-month Lifetime expected credit losses Not applying Total Non-impaired Impaired (In millions of Korean won) Loans measured at amortized cost* Corporate Grade 1 ￦ 83,839,707 ￦ 2,621,898 ￦ 1,000 ￦ — ￦ 86,462,605 Grade 2 58,057,809 4,683,445 7,052 — 62,748,306 Grade 3 2,650,199 2,187,662 4,194 — 4,842,055 Grade 4 518,108 900,386 4,605 — 1,423,099 Grade 5 16,648 355,893 805,938 — 1,178,479 145,082,471 10,749,284 822,789 — 156,654,544 Retail Grade 1 146,265,744 3,611,001 8,155 — 149,884,900 Grade 2 7,081,846 4,433,832 29,304 — 11,544,982 Grade 3 2,080,690 1,541,647 11,366 — 3,633,703 Grade 4 185,081 387,811 9,722 — 582,614 Grade 5 10,180 587,448 545,295 — 1,142,923 155,623,541 10,561,739 603,842 — 166,789,122 Credit card Grade 1 8,390,177 96,052 — — 8,486,229 Grade 2 5,695,069 719,065 — — 6,414,134 Grade 3 1,558,999 1,161,396 — — 2,720,395 Grade 4 26,404 390,941 — — 417,345 Grade 5 350 135,630 474,327 — 610,307 15,670,999 2,503,084 474,327 — 18,648,410 316,377,011 23,814,107 1,900,958 — 342,092,076 Loans measured at fair value through other comprehensive income Corporate Grade 1 241,524 — — — 241,524 Grade 2 133,574 — — — 133,574 Grade 3 — — — — — Grade 4 — — — — — Grade 5 — — — — — 375,098 — — — 375,098 375,098 — — — 375,098 ￦ 316,752,109 ￦ 23,814,107 ￦ 1,900,958 ￦ — ￦ 342,467,174 December 31, 2020 12-month Lifetime expected credit losses Not applying Total Non-impaired Impaired (In millions of Korean won) Loans measured at amortized cost* Corporate Grade 1 ￦ 93,033,311 ￦ 4,646,801 ￦ 7,042 ￦ — ￦ 97,687,154 Grade 2 61,701,031 7,060,916 7,817 — 68,769,764 Grade 3 2,702,369 2,507,455 3,055 — 5,212,879 Grade 4 611,743 1,085,704 8,562 — 1,706,009 Grade 5 18,792 394,935 2,162,732 — 2,576,459 158,067,246 15,695,811 2,189,208 — 175,952,265 Retail Grade 1 163,261,012 3,536,290 6,789 — 166,804,091 Grade 2 8,828,445 4,197,409 34,896 — 13,060,750 Grade 3 2,519,004 1,322,878 9,012 — 3,850,894 Grade 4 225,262 402,881 8,352 — 636,495 Grade 5 39,466 636,361 672,397 — 1,348,224 174,873,189 10,095,819 731,446 — 185,700,454 Credit card Grade 1 8,210,540 412,555 — — 8,623,095 Grade 2 5,831,625 708,405 — — 6,540,030 Grade 3 1,526,382 1,216,434 — — 2,742,816 Grade 4 16,978 247,241 — — 264,219 Grade 5 2,101 118,907 506,462 — 627,470 15,587,626 2,703,542 506,462 — 18,797,630 348,528,061 28,495,172 3,427,116 — 380,450,349 Loans measured at fair value through other comprehensive income Corporate Grade 1 235,469 — — — 235,469 Grade 2 57,940 — — — 57,940 Grade 3 — — — — — Grade 4 — — — — — Grade 5 — — — — — 293,409 — — — 293,409 293,409 — — — 293,409 ￦ 348,821,470 ￦ 28,495,172 ￦ 3,427,116 ￦ — ￦ 380,743,758 * Before netting of allowance Credit qualities of loans graded according to internal credit ratings as of December 31, 2019 and 2020, are as follows: Range of Probability Retail Corporate Grade 1 0.0 ~ 1.0 1 ~ 5 grade AAA ~ BBB+ Grade 2 1.0 ~ 5.0 6 ~ 8 grade BBB ~ BB Grade 3 5.0 ~ 15.0 9 ~ 10 grade BB- Grade 4 15.0 ~ 30.0 11 grade B- Grade 5 30.0 ~ 12 grade or under CC or under 4.2.4.2 Quantification of the extent to which collateral and other credit enhancements mitigate credit risk of loans as of December 31, 2019 and 2020, are as follows: December 31, 2019 12-month Lifetime expected credit losses Total Non-impaired Impaired (In millions of Korean won) Guarantees ￦ 70,183,658 ￦ 3,839,736 ￦ 179,825 ￦ 74,203,219 Deposits and savings 4,478,032 118,221 8,034 4,604,287 Property and equipment 10,014,552 582,109 55,410 10,652,071 Real estate 155,769,901 10,839,595 417,815 167,027,311 ￦ 240,446,143 ￦ 15,379,661 ￦ 661,084 ￦ 256,486,888 December 31, 2020 12-month Lifetime expected credit losses Total Non-impaired Impaired (In millions of Korean won) Guarantees ￦ 79,088,720 ￦ 5,732,814 ￦ 187,512 ￦ 85,009,046 Deposits and savings 5,210,681 149,745 67,047 5,427,473 Property and equipment 11,607,675 808,476 120,471 12,536,622 Real estate 170,171,707 12,836,286 1,836,865 184,844,858 ￦ 266,078,783 ￦ 19,527,321 ￦ 2,211,895 ￦ 287,817,999 4.2.5 Credit risk of securities Credit qualities of securities other than equity securities that are exposed to credit risk as of December 31, 2019 and 2020, are as follows: December 31, 2019 12-month Lifetime expected credit Not applying Total Non-impaired Impaired (In millions of Korean won) Securities measured at amortized cost* Grade 1 ￦ 25,147,636 ￦ — ￦ — ￦ — ￦ 25,147,636 Grade 2 157,881 — — — 157,881 Grade 3 42,710 — — — 42,710 Grade 4 — — — — — Grade 5 — — — — — 25,348,227 — — — 25,348,227 Securities measured at fair value through other comprehensive income Grade 1 40,206,856 — — — 40,206,856 Grade 2 3,337,327 — — — 3,337,327 Grade 3 12,665 — — — 12,665 Grade 4 — — — — — Grade 5 — — — — — 43,556,848 — — — 43,556,848 ￦ 68,905,075 ￦ — ￦ — ￦ — ￦ 68,905,075 December 31, 2020 12-month Lifetime expected credit Not applying Total Non-impaired Impaired (In millions of Korean won) Securities measured at amortized cost* Grade 1 ￦ 36,467,719 ￦ — ￦ — ￦ — ￦ 36,467,719 Grade 2 359,551 — — — 359,551 Grade 3 38,847 7,061 — — 45,908 Grade 4 — — — — — Grade 5 — — — — — 36,866,117 7,061 — — 36,873,178 Securities measured at fair value through other comprehensive income Grade 1 54,576,777 — — — 54,576,777 Grade 2 3,746,200 — — — 3,746,200 Grade 3 126,391 — — — 126,391 Grade 4 7,521 — — — 7,521 Grade 5 — — — — — 58,456,889 — — — 58,456,889 ￦ 95,323,006 ￦ 7,061 ￦ — ￦ — ￦ 95,330,067 * Before netting of allowance Credit qualities of securities other than equity securities, according to the credit ratings by external rating agencies as of December 31, 2019 and 2020, are as follows: Domestic Foreign Credit quality KIS NICE P&I KAP FnPricing Inc. S&P Fitch-IBCA Moody’s Grade 1 AA0 to AAA AA0 to AAA AA0 to AAA AA0 to AAA A- A- A3 to Aaa Grade 2 A- A- A- A- BBB- to BBB+ BBB- to BBB+ Baa3 to Baa1 Grade 3 BBB0 to BBB+ BBB0 to BBB+ BBB0 to BBB+ BBB0 to BBB+ BB to BB+ BB to BB+ Ba2 to Ba1 Grade 4 BB0 to BBB- BB0 to BBB- BB0 to BBB- BB0 to BBB- B+ to BB- B+ to BB- B1 to Ba3 Grade 5 BB- BB- or under BB- or under BB- or under B or under B or under B2 or under Credit qualities of debt securities denominated in Korean won are based on the lowest credit rating by the domestic agencies above, and those denominated in foreign currencies are based on the lowest credit rating by the foreign agencies above. 4.2.6 Credit risk of due from financial institutions Credit qualities of due from financial institutions as of December 31, 2019 and 2020, are as follows: December 31, 2019 12-month expected Lifetime expected credit losses Not applying Total Non-impaired Impaired (In millions of Korean won) Due from financial institutions measured at amortized cost* Grade 1 ￦ 17,292,966 ￦ — ￦ — ￦ — ￦ 17,292,966 Grade 2 149,927 — — — 149,927 Grade 3 677,249 — — — 677,249 Grade 4 — — — — — Grade 5 13,991 13,179 360 — 27,530 ￦ 18,134,133 ￦ 13,179 ￦ 360 ￦ — ￦ 18,147,672 December 31, 2020 12-month expected Lifetime expected credit losses Not applying Total Non-impaired Impaired (In millions of Korean won) Due from financial institutions measured at amortized cost* Grade 1 ￦ 21,437,207 ￦ — ￦ — ￦ — ￦ 21,437,207 Grade 2 334,371 — — — 334,371 Grade 3 445,732 13,099 — — 458,831 Grade 4 479,142 — — — 479,142 Grade 5 13,520 — 283 — 13,803 ￦ 22,709,972 ￦ 13,099 ￦ 283 ￦ — ￦ 22,723,354 * Before netting of allowance The classification criteria of the credit qualities of due from financial institutions as of December 31, 2019 and 2020, is the same as the criteria for securities other than equity securities. 4.2.7 Credit risk mitigation of derivative financial instruments The quantification of the extent to which collateral mitigates credit risk of derivative financial instruments as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Deposits, savings, securities, etc. ￦ 802,170 ￦ 1,651,322 4.2.8 Credit risk concentration analysis 4.2.8.1 Details of loans by country as of December 31, 2019 and 2020, are as follows: December 31, 2019* Retail Corporate Credit card Total % Allowances Carrying (In millions of Korean won) Korea ￦ 166,310,457 ￦ 149,149,657 ￦ 18,642,111 ￦ 334,102,225 97.44 ￦ (2,363,332 ) ￦ 331,738,893 Europe — 1,118,429 — 1,118,429 0.33 (4,181 ) 1,114,248 China — 3,135,501 358 3,135,859 0.91 (20,654 ) 3,115,205 Japan 101 647,956 81 648,138 0.19 (576 ) 647,562 United States — 2,333,269 — 2,333,269 0.68 (9,205 ) 2,324,064 Others 478,564 1,072,375 5,860 1,556,799 0.45 (10,069 ) 1,546,730 ￦ 166,789,122 ￦ 157,457,187 ￦ 18,648,410 ￦ 342,894,719 100.00 ￦ (2,408,017 ) ￦ 340,486,702 December 31, 2020* Retail Corporate Credit card Total % Allowances Carrying (In millions of Korean won) Korea ￦ 182,344,832 ￦ 160,385,598 ￦ 18,734,570 ￦ 361,465,000 94.85 ￦ (2,433,702 ) ￦ 359,031,298 Europe — 2,042,979 — 2,042,979 0.54 (11,141 ) 2,031,838 China — 4,518,737 654 4,519,391 1.19 (20,489 ) 4,498,902 Japan 94 923,354 10 923,458 0.24 (1,249 ) 922,209 United States — 1,962,377 — 1,962,377 0.51 (21,489 ) 1,940,888 Cambodia 1,444,906 2,280,180 — 3,725,086 0.98 (89,652 ) 3,635,434 Indonesia 1,483,345 3,637,351 60,959 5,181,655 1.36 (699,947 ) 4,481,708 Others 427,276 833,080 1,437 1,261,793 0.33 (5,694 ) 1,256,099 ￦ 185,700,453 ￦ 176,583,656 ￦ 18,797,630 ￦ 381,081,739 100.00 ￦ (3,283,363 ) ￦ 377,798,376 * Amount includes loans measured at fair value through profit or loss, other comprehensive income and amortized cost. 4.2.8.2 Details of corporate loans by industry as of December 31, 2019 and 2020, are as follows: December 31, 2019 Loans % Allowances Carrying amount (In millions of Korean won) Financial institutions ￦ 16,405,404 10.42 ￦ (14,819 ) ￦ 16,390,585 Manufacturing 43,265,607 27.48 (394,428 ) 42,871,179 Service 65,277,701 41.46 (195,205 ) 65,082,496 Wholesale & Retail 18,593,540 11.81 (99,051 ) 18,494,489 Construction 3,679,798 2.34 (194,737 ) 3,485,061 Public sector 1,250,909 0.79 (2,084 ) 1,248,825 Others 8,984,228 5.70 (56,662 ) 8,927,566 ￦ 157,457,187 100.00 ￦ (956,986 ) ￦ 156,500,201 December 31, 2020 Loans % Allowances Carrying amount (In millions of Korean won) Financial institutions ￦ 16,044,243 9.09 ￦ (20,987 ) ￦ 16,023,256 Manufacturing 45,884,606 25.98 (473,360 ) 45,411,246 Service 76,001,877 43.04 (385,093 ) 75,616,784 Wholesale & Retail 23,129,457 13.10 (241,021 ) 22,888,436 Construction 4,397,814 2.49 (190,819 ) 4,206,995 Public sector 1,660,370 0.94 (74,839 ) 1,585,531 Others 9,465,289 5.36 (285,660 ) 9,179,629 ￦ 176,583,656 100.00 ￦ (1,671,779 ) ￦ 174,911,877 4.2.8.3 Details of retail loans and credit card receivables as of December 31, 2019 and 2020, are as follows: December 31, 2019 Loans % Allowances Carrying amount (In millions of Korean won) Housing ￦ 78,102,637 42.12 ￦ (34,395 ) ￦ 78,068,242 General 88,686,485 47.83 (676,927 ) 88,009,558 Credit card 18,648,410 10.05 (739,709 ) 17,908,701 ￦ 185,437,532 100.00 ￦ (1,451,031 ) ￦ 183,986,501 December 31, 2020 Loans % Allowances Carrying amount (In millions of Korean won) Housing ￦ 87,312,052 42.70 ￦ (61,155 ) ￦ 87,250,897 General 98,388,401 48.11 (848,933 ) 97,539,468 Credit card 18,797,630 9.19 (701,496 ) 18,096,134 ￦ 204,498,083 100.00 ￦ (1,611,584 ) ￦ 202,886,499 4.2.8.4 Details of credit risk of due from financial institutions, securities other than equity securities and derivative financial assets by industry as of December 31, 2019 and 2020, are as follows: December 31, 2019 Amount % Allowances Carrying amount (In millions of Korean won) Due from financial institutions measured at amortized cost Finance and insurance ￦ 18,147,672 100.00 ￦ (4,712 ) ￦ 18,142,960 18,147,672 100.00 (4,712 ) 18,142,960 Due from financial institutions measured at fair value through profit or loss Finance and insurance 216,367 100.00 — 216,367 216,367 100.00 — 216,367 Securities measured at fair value through profit or loss Government and government funded institutions 11,937,703 23.53 — 11,937,703 Finance and insurance 32,475,354 64.03 — 32,475,354 Others 6,308,469 12.44 — 6,308,469 50,721,526 100.00 — 50,721,526 Derivative financial assets Government and government funded institutions 7,330 0.23 — 7,330 Finance and insurance 3,003,371 94.13 — 3,003,371 Others 179,972 5.64 — 179,972 3,190,673 100.00 — 3,190,673 Securities measured at fair value through other comprehensive income Government and government funded institutions 16,744,232 38.44 — 16,744,232 Finance and insurance 21,439,272 49.22 — 21,439,272 Others 5,373,344 12.34 — 5,373,344 43,556,848 100.00 — 43,556,848 Securities measured at amortized cost Government and government funded institutions 11,115,435 43.86 (37 ) 11,115,398 Finance and insurance 12,279,883 48.44 (1,349 ) 12,278,534 Others 1,952,909 7.70 (286 ) 1,952,623 25,348,227 100.00 (1,672 ) 25,346,555 ￦ 141,181,313 ￦ (6,384 ) ￦ 141,174,929 December 31, 2020 Amount % Allowances Carrying amount (In millions of Korean won) Due from financial institutions measured at amortized cost Finance and insurance ￦ 22,723,354 100.00 ￦ (3,263 ) ￦ 22,720,091 22,723,354 100.00 (3,263 ) 22,720,091 Due from financial institutions measured at fair value through profit or loss Finance and insurance 100,094 100.00 — 100,094 100,094 100.00 — 100,094 Securities measured at fair value through profit or loss Government and government funded institutions 16,902,284 28.94 — 16,902,284 Finance and insurance 34,244,398 58.62 — 34,244,398 Others 7,268,418 12.44 — 7,268,418 58,415,100 100.00 — 58,415,100 Derivative financial assets Government and government funded institutions 44,670 0.81 — 44,670 Finance and insurance 4,925,535 88.82 — 4,925,535 Others 575,180 10.37 — 575,180 5,545,385 100.00 — 5,545,385 Securities measured at fair value through other comprehensive income Government and government funded institutions 26,205,864 44.83 — 26,205,864 Finance and insurance 24,847,602 42.51 — 24,847,602 Others 7,403,423 12.66 — 7,403,423 58,456,889 100.00 — 58,456,889 Securities measured at amortized cost Government and government funded institutions 24,018,884 65.14 (30 ) 24,018,854 Finance and insurance 11,019,911 29.89 (2,475 ) 11,017,436 Others 1,834,383 4.97 (445 ) 1,833,938 36,873,178 100.00 (2,950 ) 36,870,228 ￦ 182,114,000 ￦ (6,213 ) ￦ 182,107,787 4.2.8.5 Details of credit risk of due from financial institutions, securities other than equity securities and derivative financial assets by country as of December 31, 2019 and 2020, are as follows: December 31, 2019 Amount % Allowances Carrying amount (In millions of Korean won) Due from financial institutions measured at amortized cost Korea ￦ 13,864,687 76.40 ￦ (555 ) ￦ 13,864,132 United States 1,318,582 7.27 (1 ) 1,318,581 Others 2,964,403 16.33 (4,156 ) 2,960,247 18,147,672 100.00 (4,712 ) 18,142,960 Due from financial institutions measured at fair value through profit or loss Korea 216,367 100.00 — 216,367 216,367 100.00 — 216,367 Securities measured at fair value through profit or loss Korea 46,413,061 91.51 — 46,413,061 United States 1,939,330 3.82 — 1,939,330 Others 2,369,135 4.67 — 2,369,135 50,721,526 100.00 — 50,721,526 Derivative financial assets Korea 1,440,349 45.14 — 1,440,349 United States 529,956 16.61 — 529,956 France 358,951 11.25 — 358,951 Others 861,417 27.00 — 861,417 3,190,673 100.00 — 3,190,673 Securities measured at fair value through other comprehensive income Korea 40,948,853 94.01 — 40,948,853 United States 687,243 1.58 — 687,243 Others 1,920,752 4.41 — 1,920,752 43,556,848 100.00 — 43,556,848 Securities measured at amortized cost Korea 22,591,541 89.12 (1,034 ) 22,590,507 United States 1,312,941 5.18 (217 ) 1,312,724 Others 1,443,745 5.70 (421 ) 1,443,324 25,348,227 100.00 (1,672 ) 25,346,555 ￦ 141,181,313 ￦ (6,384 ) ￦ 141,174,929 December 31, 2020 Amount % Allowances Carrying amount (In millions of Korean won) Due from financial institutions measured at amortized cost Korea ￦ 16,535,849 72.78 ￦ (607) ￦ 16,535,242 United States 2,030,614 8.94 (283 ) 2,030,331 Others 4,156,891 18.28 (2,373 ) 4,154,518 22,723,354 100.00 (3,263 ) 22,720,091 Due from financial institutions measured at fair value through profit or loss Korea 100,094 100.00 — 100,094 100,094 100.00 — 100,094 Securities measured at fair value through profit or loss Korea 53,991,978 92.43 — 53,991,978 United States 2,370,538 4.06 — 2,370,538 Others 2,052,584 3.51 — 2,052,584 58,415,100 100.00 — 58,415,100 Derivative financial assets Korea 2,885,214 52.03 — 2,885,214 United States 706,866 12.75 — 706,866 Others 1,953,305 35.22 — 1,953,305 5,545,385 100.00 — 5,545,385 Securities measured at fair value through other comprehensive income Korea 54,786,461 93.72 — 54,786,461 United States 942,151 1.61 — 942,151 Others 2,728,277 4.67 — 2,728,277 58,456,889 100.00 — 58,456,889 Securities measured at amortized cost Korea 34,545,872 93.69 (2,283 ) 34,543,589 United States 1,049,387 2.85 (241 ) 1,049,146 Others 1,277,919 3.46 (426 ) 1,277,493 36,873,178 100.00 (2,950 ) 36,870,228 ￦ 182,114,000 ￦ (6,213 ) ￦ 182,107,787 Due from financial institutions and financial instruments at fair value through profit or loss that are linked to gold price and derivatives are mostly related to finance and insurance industry with high credit ratings. 4.3 Liquidity Risk 4.3.1 Overview of liquidity risk Liquidity risk is a risk that the Group becomes insolvent due to the mismatch between the inflow and outflow of funds, unexpected cash outflows, or a risk of loss due to financing funds at a high interest rate or disposing of securities at an unfavorable price due to lack of available funds. The Group manages its liquidity risk through analysis of the contractual maturity of interest-bearing assets and liabilities, assets and liabilities related to the other inflows and outflows of funds, and off-balance 4.3.2 Liquidity risk management and indicator The liquidity risk is managed by risk management policies and liquidity risk management guidelines set forth in these policies applied to all risk management policies and procedures that may arise throughout the overall business of the Group. The Group calculates and manages cumulative liquidity gaps and liquidity ratio for all transactions and off-balance 4.3.3 Analysis of remaining contractual maturity of financial assets and liabilities The cash flows disclosed in the maturity analysis are undiscounted contractual amounts including principal and future interest receivables and payments; as such, the table below do not match with the amounts in the consolidated statements of financial position which are based on discounted cash flows. The future interest receipts and payments for floating-rate assets and liabilities are calculated on the assumption that the current interest rate is the same until maturity. 4.3.3.1 Remaining contractual maturity of financial assets and liabilities other than derivatives held for cash flow hedge as of December 31, 2019 and 2020, are as follows: December 31, 2019 On Up to 1-3 3-12 1-5 Over 5 Total (In millions of Korean won) Financial assets Cash and due from financial institutions 1 ￦ 5,323,332 ￦ 1,038,805 ￦ 286,091 ￦ 822,123 ￦ 18,628 ￦ — ￦ 7,488,979 Financial assets at fair value through profit or loss 52,488,545 446,069 273,144 187,821 236,130 1,011,289 54,642,998 Derivatives held for trading 2 3,008,598 — — — — — 3,008,598 Derivatives held for hedging 3 — 4,892 20,216 37,441 41,401 66,176 170,126 Loans measured at amortized cost 2,908,095 33,042,040 32,668,128 125,125,270 94,802,566 96,757,198 385,303,297 Financial investments 4 Financial assets at fair value through other comprehensive income 2,101,605 526,465 1,403,884 6,761,533 33,604,010 4,506,581 48,904,078 Securities measured at amortized cost — 1,002,164 2,080,834 5,700,500 7,366,945 15,888,344 32,038,787 Other financial assets 71,528 6,578,005 179,790 1,373,850 40,243 35,927 8,279,343 ￦ 65,901,703 ￦ 42,638,440 ￦ 36,912,087 ￦ 140,008,538 ￦ 136,109,923 ￦ 118,265,515 ￦ 539,836,206 December 31, 2019 On Up to 1-3 3-12 1-5 Over 5 Total (In millions of Korean won) Financial liabilities Financial liabilities at fair value through profit or loss 2 ￦ 2,663,327 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 2,663,327 Financial liabilities designated at fair value through profit or loss 2 12,704,826 — — — — — 12,704,826 Derivatives held for trading 2 2,842,950 — — — — — 2,842,950 Derivatives held for hedging 3 — 14,764 15,588 1,652 20,044 129 52,177 Deposits 5 141,821,986 17,180,492 27,300,542 110,410,809 10,804,440 2,354,504 309,872,773 Borrowings 7,074,508 12,341,516 3,057,980 8,994,817 4,950,294 1,763,234 38,182,349 Debentures 22,285 2,652,730 3,812,476 11,062,873 32,477,672 3,515,716 53,543,752 Lease liabilities 256 19,304 35,730 137,419 318,781 66,032 577,522 Other financial liabilities 114,320 17,663,385 187,976 212,059 693,921 119,637 18,991,298 ￦ 167,244,458 ￦ 49,872,191 ￦ 34,410,292 ￦ 130,819,629 ￦ 49,265,152 ￦ 7,819,252 ￦ 439,430,974 Off-balance Commitments 6 ￦ 151,797,615 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 151,797,615 Financial guarantee contracts 7 3,847,390 — — — — — 3,847,390 ￦ 155,645,005 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 155,645,005 December 31, 2020 On Up to 1-3 3-12 1-5 Over 5 Total (In millions of Korean won) Financial assets Cash and due from financial institutions 1 ￦ 7,186,004 ￦ 1,449,949 ￦ 469,858 ￦ 1,217,217 ￦ 35,056 ￦ — ￦ 10,358,084 Financial assets at fair value through profit or loss 60,520,103 242,664 83,408 25,658 142,547 561,959 61,576,339 Derivatives held for trading 2 5,210,512 — — — — — 5,210,512 Derivatives held for hedging 3 — 9,371 32,816 74,364 70,863 88,462 275,876 Loans measured at amortized cost 3,126,366 29,240,531 35,862,097 135,526,320 116,211,931 103,685,410 423,652,655 Financial investments 4 Financial assets at fair value through other comprehensive income 2,532,279 896,523 1,556,600 10,523,465 35,347,644 16,949,942 67,806,453 Securities measured at amortized cost — 1,003,104 2,724,223 2,567,726 9,658,717 29,923,188 45,876,958 Other financial assets 89,855 11,514,303 206,227 1,273,876 73,735 48,019 13,206,015 ￦ 78,665,119 ￦ 44,356,445 ￦ 40,935,229 ￦ 151,208,626 ￦ 161,540,493 ￦ 151,256,980 ￦ 627,962,892 December 31, 2020 On Up to 1-3 3-12 1-5 Over 5 Total (In millions of Korean won) Financial liabilities Financial liabilities at fair value through profit or loss 2 ￦ 2,025,952 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 2,025,952 Financial liabilities designated at fair value through profit or loss 2 9,784,107 — — — — — 9,784,107 Derivatives held for trading 2 5,014,072 — — — — — 5,014,072 Derivatives held for hedging 3 — 3,123 4,120 62,147 35,198 109 104,697 Deposits 5 182,111,594 17,207,360 28,485,765 99,879,946 12,133,364 1,664,509 341,482,538 Borrowings 9,333,894 17,730,230 4,923,897 9,617,100 7,616,809 938,374 50,160,304 Debentures 18,105 2,806,105 6,769,859 14,330,686 35,512,544 6,241,226 65,678,525 Lease liabilities 205 22,372 40,376 152,084 332,033 44,882 591,952 Other financial liabilities 217,866 24,153,880 208,745 329,291 748,593 215,447 25,873,822 ￦ 208,505,795 ￦ 61,923,070 ￦ 40,432,762 ￦ 124,371,254 ￦ 56,378,541 ￦ 9,104,547 ￦ 500,715,969 Off-balance Commitments 6 ￦ 159,133,983 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 159,133,983 Acceptances and guarantees contracts 8,548,928 — — — — — 8,548,928 Financial guarantee contracts 7 4,964,468 — — — — — 4,964,468 ￦ 172,647,379 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 172,647,379 1 Restricted due from financial instruments amounting to ￦ 13,394,627 million and ￦ 15,331,515 million are excluded as of December 31, 2019 and 2020, respectively. 2 Financial liabilities measured or designated at fair value through profit or loss and derivatives held for trading are not managed by contractual maturity because they are expected to be traded or redeemed before maturity. Therefore, the carrying amounts of those financial instruments are included in the ‘On demand’ category. 3 Cash flows of derivative instruments held for hedging are shown at net amounts of cash inflows and outflows by remaining contractual maturity. 4 Equity securities designated as financial assets at fair value through other comprehensive income are included in the ‘On demand’ category because most are available for sale at any time. However, equity securities restricted from sale, are included in the category corresponding to the date on which the restriction is lifted. 5 Deposits that are contractually repayable on demand or on short notice are included in the ‘On demand’ category. 6 Commitments are included in the ‘On demand’ category because payments can be requested at any time. 7 Cash flows under financial guarantee contracts are classified based on the earliest period that the contract can be executed. 4.3.3.2 Contractual cash flows of derivatives held for cash flow hedge as of December 31, 2019 and 2020, are as follows: December 31, 2019 Up to 1-3 3-12 1-5 Over 5 years Total (In millions of Korean won) Cash flow to be received (paid) of net-settled ￦ (639 ) ￦ (1,831 ) ￦ (5,021 ) ￦ (10,602 ) ￦ 1,084 ￦ (17,009 ) Cash flow to be received of gross-settled derivatives 14,119 200,170 657,909 1,888,772 — 2,760,970 Cash flow to be paid of gross-settled derivatives (18,171 ) (199,141 ) (671,375 ) (1,955,650 ) — (2,844,337 ) December 31, 2020 Up to 1 1-3 3-12 1-5 Over 5 years Total (In millions of Korean won) Cash flow t

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2020
Disclosure Of Operating Segments Abstract [Abstract]
Disclosure Of Entitys Reportable Segments Explanatory	5. Segment Information 5.1 Overall Segment Information and Business Segments The Group classifies reporting segments based on the nature of the products and services provided, the type of customer, and the Group’s management organization. Banking business Corporate banking Loans, deposit products and other related financial services to large, small and medium-sized Retail banking Loans, deposit products and other related financial services to individuals and households Other banking services Trading activities in securities and derivatives, funding and other supporting activities Securities business Investment banking, brokerage services and other supporting activities Non-life Non-life Credit card business Credit sale, cash service, card loan and other supporting activities Life insurance business Life insurance and other supporting activities Financial information by business segment for the years ended December 31, 2019 and 2020, are as follows: 2019 Banking business Corporate Retail Other banking Sub-total Securities Non-life Credit card Life Others Consolidation Total (In millions of Korean won) Operating revenues from external customers ￦ 2,375,800 ￦ 2,979,503 ￦ 1,591,323 ￦ 6,946,626 ￦ 1,113,200 ￦ 1,185,600 ￦ 1,470,910 ￦ 107,404 ￦ 608,111 ￦ — ￦ 11,431,851 Intersegment operating revenues (expenses) 204,476 — 167,966 372,442 (18,795 ) (54,160 ) (209,874 ) (22,742 ) 124,857 (191,728 ) — 2,580,276 2,979,503 1,759,289 7,319,068 1,094,405 1,131,440 1,261,036 84,662 732,968 (191,728) 11,431,851 Net interest income 2,844,880 3,148,061 370,846 6,363,787 529,888 616,378 1,230,288 159,248 296,512 686 9,196,787 Interest income 4,642,555 4,872,937 1,264,456 10,779,948 852,153 617,617 1,581,178 159,463 687,823 (38,995 ) 14,639,187 Interest expense (1,797,675 ) (1,724,876 ) (893,610 ) (4,416,161 ) (322,265 ) (1,239 ) (350,890 ) (215 ) (391,311 ) 39,681 (5,442,400 ) Net fee and commission income (expenses) 349,393 471,869 312,034 1,133,296 580,435 (152,597 ) 261,829 (16,792 ) 541,343 7,490 2,355,004 Fee and commission income 459,879 577,845 445,638 1,483,362 683,600 11,095 1,406,273 239 617,622 (322,944 ) 3,879,247 Fee and commission expense (110,486 ) (105,976 ) (133,604 ) (350,066 ) (103,165 ) (163,692 ) (1,144,444 ) (17,031 ) (76,279 ) 330,434 (1,524,243 ) Net insurance income (expenses) — — — — — 415,112 15,748 (122,295 ) — (9,053 ) 299,512 Insurance income — — — — — 11,375,543 28,874 942,662 — (29,897 ) 12,317,182 Insurance expenses — — — — — (10,960,431 ) (13,126 ) (1,064,957 ) — 20,844 (12,017,670 ) Net gains (losses) on financial instruments at fair value through profit or loss (2,526 ) — 425,150 422,624 (103,815 ) 265,187 371 66,773 137,680 (144,948 ) 643,872 Net other operating income (expenses) (611,471 ) (640,427 ) 651,259 (600,639 ) 87,897 (12,640 ) (247,200 ) (2,272 ) (242,567 ) (45,903 ) (1,063,324 ) General and administrative expenses ￦ (1,241,721 ) ￦ (1,982,375 ) ￦ (663,323 ) ￦ (3,887,419 ) ￦ (757,276 ) ￦ (843,800 ) ￦ (441,921 ) ￦ (66,514 ) ￦ (373,919 ) ￦ 99,832 ￦ (6,271,017 ) Operating profit before provision for credit losses 1,338,555 997,128 1,095,966 3,431,649 337,129 287,640 819,115 18,148 359,049 (91,896 ) 5,160,834 Reversal (provision) for credit losses 125,919 (235,995 ) 6,546 (103,530 ) (14,366 ) 12,959 (439,765 ) 3,084 (128,331 ) (236 ) (670,185 ) Net operating income 1,464,474 761,133 1,102,512 3,328,119 322,763 300,599 379,350 21,232 230,718 (92,132 ) 4,490,649 Share of profit (loss) of associates and joint ventures — — 29,240 29,240 (103 ) (21 ) 1,106 — 7,201 (20,972 ) 16,451 Net other non-operating (262 ) — (38,625 ) (38,887 ) 30,518 26,490 3,362 (30 ) 34,644 (29,211 ) 26,886 Segment profit before income tax 1,464,212 761,133 1,093,127 3,318,472 353,178 327,068 383,818 21,202 272,563 (142,315 ) 4,533,986 Income tax expense (404,426 ) (209,311 ) (265,656 ) (879,393 ) (95,271 ) (92,381 ) (67,262 ) (5,238 ) (90,366 ) 9,124 (1,220,787 ) Profit for the year ￦ 1,059,786 ￦ 551,822 ￦ 827,471 ￦ 2,439,079 ￦ 257,907 ￦ 234,687 ￦ 316,556 ￦ 15,964 ￦ 182,197 ￦ (133,191 ) ￦ 3,313,199 Profit attributable to shareholders of the Parent Company 1,059,786 551,822 827,471 2,439,079 257,893 234,326 316,545 15,964 179,783 (131,762 ) 3,311,828 Profit attributable to non-controlling — — — — 14 361 11 — 2,414 (1,429 ) 1,371 Total assets* 139,496,393 147,468,173 100,460,472 387,425,038 47,816,512 36,552,368 22,990,115 9,801,904 42,140,936 (28,188,756 ) 518,538,117 Total liabilities* 142,063,122 161,834,984 54,522,699 358,420,805 43,131,858 32,689,460 18,925,195 9,186,567 18,675,585 (1,610,678 ) 479,418,792 2020 Banking business Securities Non-life Credit card Life Others Consolidation Total Corporate Retail Other Sub-total (In millions of Korean won) Operating revenues from external customers ￦ 2,833,601 ￦ 2,918,826 ￦ 1,797,921 ￦ 7,550,348 ￦ 1,448,409 ￦ 1,027,269 ￦ 1,538,230 ￦ 237,416 ￦ 690,970 ￦ — ￦ 12,492,642 Intersegment operating revenues (expenses) 178,199 — 108,118 286,317 (6,366 ) 5,976 (183,480 ) (9,655 ) 324,910 (417,702 ) — 3,011,800 2,918,826 1,906,039 7,836,665 1,442,043 1,033,245 1,354,750 227,761 1,015,880 (417,702 ) 12,492,642 Net interest income 3,238,002 3,178,280 338,484 6,754,766 510,566 615,951 1,265,703 260,925 314,832 (469 ) 9,722,274 Interest income 4,899,943 4,519,579 1,036,643 10,456,165 820,100 616,852 1,631,520 261,056 726,668 (26,614 ) 14,485,747 Interest expense (1,661,941 ) (1,341,299 ) (698,159 ) (3,701,399 ) (309,534 ) (901 ) (365,817 ) (131 ) (411,836 ) 26,145 (4,763,473 ) Net fee and commission income (expenses) 363,459 406,603 297,860 1,067,922 916,758 (171,220 ) 400,485 (18,059 ) 776,282 (13,229 ) 2,958,939 Fee and commission income 480,190 529,178 440,319 1,449,687 1,037,545 8,571 1,485,718 98 871,499 (326,094 ) 4,527,024 Fee and commission expense (116,731 ) (122,575 ) (142,459 ) (381,765 ) (120,787 ) (179,791 ) (1,085,233 ) (18,157 ) (95,217 ) 312,865 (1,568,085 ) Net insurance income (expenses) — — — — — 376,827 13,283 (91,410 ) — 1,293 299,993 Insurance income — — — — — 12,367,894 23,989 2,026,052 — (31,295 ) 14,386,640 Insurance expenses — — — — — (11,991,067 ) (10,706 ) (2,117,462 ) — 32,588 (14,086,647 ) Net gains (losses) on financial instruments at fair value through profit or loss (52,493 ) — 296,676 244,183 117,792 259,274 5,904 71,350 396,626 (83,763 ) 1,011,366 Net other operating income (expenses) (537,168 ) (666,057 ) 973,019 (230,206 ) (103,073 ) (47,587 ) (330,625 ) 4,955 (471,860 ) (321,534 ) (1,499,930 ) General and administrative expenses ￦ (1,555,089) ￦ (2,072,515) ￦ (573,742) ￦ (4,201,346) ￦ (844,503) ￦ (829,263) ￦ (514,845) ￦ (152,271) ￦ (405,530) ￦ 114,606 ￦ (6,833,152) Operating profit before provision for credit losses 1,456,711 846,311 1,332,297 3,635,319 597,540 203,982 839,905 75,490 610,350 (303,096 ) 5,659,490 Reversal (provision) for credit losses (204,302 ) (264,943 ) (14,937 ) (484,182 ) (23,827 ) 7,569 (396,376 ) 472 (148,127 ) 973 (1,043,498 ) Net operating income 1,252,409 581,368 1,317,360 3,151,137 573,713 211,551 443,529 75,962 462,223 (302,123 ) 4,615,992 Share of profit (loss) of associates and joint ventures — — (48,158 ) (48,158 ) 3,598 (42 ) 1,127 1 553 (829 ) (43,750 ) Net other non-operating 5,490 — 23,354 28,844 4,472 16,142 (6,636 ) (16,270 ) 40,927 121,911 189,390 Segment profit before income tax 1,257,899 581,368 1,292,556 3,131,823 581,783 227,651 438,020 59,693 503,703 (181,041 ) 4,761,632 Income tax expense (339,728 ) (159,876 ) (312,700 ) (812,304 ) (156,135 ) (63,778 ) (114,027 ) (27,167 ) (97,268 ) 11,328 (1,259,351 ) Profit for the year ￦ 918,171 ￦ 421,492 ￦ 979,856 ￦ 2,319,519 ￦ 425,648 ￦ 163,873 ￦ 323,993 ￦ 32,526 ￦ 406,435 ￦ (169,713) ￦ 3,502,281 Profit attributable to shareholders of the Parent Company 917,956 421,492 958,747 2,298,195 425,622 163,884 324,662 32,526 404,381 (194,119 ) 3,455,151 Profit (loss) attributable to non-controlling 215 — 21,109 21,324 26 (11 ) (669 ) — 2,054 24,406 47,130 Total assets * 164,323,181 161,330,053 112,790,880 438,444,114 57,570,654 39,078,117 24,071,645 35,546,572 47,408,052 (31,446,962 ) 610,672,192 Total liabilities * 167,236,387 176,571,944 64,227,709 408,036,040 52,516,488 35,086,458 19,789,959 32,524,518 21,598,232 (2,240,962 ) 567,310,733 * Assets and liabilities of the reporting segments are amounts before intersegment transactions. 5.2 Services and Geographical Segments 5.2.1 Services information Operating revenues from external customers by services for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Banking service ￦ 6,579,169 ￦ 6,946,626 ￦ 7,550,348 Securities service 997,898 1,113,200 1,448,409 Non-life 1,183,394 1,185,600 1,027,269 Credit card service 1,524,695 1,470,910 1,538,230 Life insurance service 113,238 107,404 237,416 Other service 461,293 608,111 690,970 ￦ 10,859,687 ￦ 11,431,851 ￦ 12,492,642 5.2.2 Geographical information Geographical operating revenues from external customers for the years ended December 31, 2018, 2019 and 2020, and major non-current Revenues from external customers Major non-current 2018 2019 2020 December 31, 2019 December 31, 2020 (In millions of Korean won) Domestic ￦ 10,666,586 ￦ 11,142,264 ￦ 11,891,540 ￦ 9,515,220 ￦ 10,603,254 United States 46,391 72,945 114,044 386,724 45,353 New Zealand 6,213 6,946 3,554 3,516 2,385 China 94,996 109,574 84,821 15,119 13,971 Cambodia 11,062 19,534 250,426 7,162 32,354 United Kingdom 8,119 10,037 28,681 85,634 81,879 Others 26,320 70,551 119,576 551,039 51,288 Consolidation — — — 68,764 487,742 ￦ 10,859,687 ￦ 11,431,851 ￦ 12,492,642 ￦ 10,633,178 ￦ 11,318,226

Financial Assets and Financial

Financial Assets and Financial Liabilities	12 Months Ended
	Dec. 31, 2020
Disclosure Of Financial Instruments Abstract [Abstract]
Disclosure Of Financial Instruments Explanatory	6. Financial Assets and Financial Liabilities 6.1 Classification and Fair Value of Financial Instruments 6.1.1 Carrying amount and fair value of financial assets and liabilities by category as of December 31, 2019 and 2020, are as follows: December 31, 2019 Carrying amount Fair value (In millions of Korean won) Financial assets Cash and due from financial institutions ￦ 20,837,878 ￦ 20,835,235 Financial assets at fair value through profit or loss 53,549,086 53,549,086 Due from financial institutions 216,367 216,367 Debt securities 50,721,526 50,721,526 Equity securities 2,103,843 2,103,843 Loans 427,545 427,545 Others 79,805 79,805 Derivatives held for trading 3,008,598 3,008,598 Derivatives held for hedging 182,075 182,075 Loans measured at amortized cost 339,684,059 340,836,884 Securities measured at amortized cost 25,346,555 26,570,494 Financial assets at fair value through other comprehensive income 46,436,051 46,436,051 Debt securities 43,556,848 43,556,848 Equity securities 2,504,105 2,504,105 Loans 375,098 375,098 Other financial assets 9,147,059 9,147,059 ￦ 498,191,361 ￦ 500,565,482 Financial liabilities Financial liabilities at fair value through profit or loss ￦ 2,663,327 ￦ 2,663,327 Financial liabilities designated at fair value through profit or loss 12,704,826 12,704,826 Derivatives held for trading 2,842,950 2,842,950 Derivatives held for hedging 164,391 164,391 Deposits 305,592,771 306,048,291 Borrowings 37,818,860 37,808,944 Debentures 50,935,583 51,558,748 Other financial liabilities 22,629,587 22,629,587 ￦ 435,352,295 ￦ 436,421,064 December 31, 2020 Carrying amount Fair value (In millions of Korean won) Financial assets Cash and due from financial institutions ￦ 25,608,842 ￦ 25,612,273 Financial assets at fair value through profit or loss 61,035,455 61,035,455 Due from financial institutions 100,094 100,094 Debt securities 58,415,100 58,415,100 Equity securities 2,092,313 2,092,313 Loans 337,983 337,983 Others 89,965 89,965 Derivatives held for trading 5,210,512 5,210,512 Derivatives held for hedging 334,873 334,873 Loans measured at amortized cost 377,166,984 378,791,808 Securities measured at amortized cost 36,870,229 38,026,073 Financial assets at fair value through other comprehensive income 61,825,197 61,825,197 Debt securities 58,456,889 58,456,889 Equity securities 3,074,899 3,074,899 Loans 293,409 293,409 Other financial assets 14,167,689 14,167,689 ￦ 582,219,781 ￦ 585,003,881 Financial liabilities Financial liabilities at fair value through profit or loss ￦ 2,025,951 ￦ 2,025,951 Financial liabilities designated at fair value through profit or loss 9,784,107 9,784,107 Derivatives held for trading 5,014,072 5,014,072 Derivatives held for hedging 208,825 208,825 Deposits 338,580,220 338,833,784 Borrowings 49,827,156 50,081,900 Debentures 62,760,687 63,189,132 Other financial liabilities 28,612,287 28,612,287 ￦ 496,813,305 ￦ 497,750,058 Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. The Group discloses the fair value of each class of assets and liabilities in a way that permits it to be compared with its carrying amount at the end of each reporting period. The best evidence of fair value of financial instruments is a quoted price in an active market. Methods of determining fair value of financial instruments are as follows: Cash and due from financial institutions Carrying amounts of cash and demand due from financial institutions and payment due from financial institutions are reasonable approximation of fair values. These financial instruments do not have a fixed maturity and are receivable on demand. Fair value of ordinary due from financial institutions is measured using Discounted Cash Flow (“DCF”) Model. Securities Fair value of financial instruments that are quoted in active markets is determined using the quoted prices. If there is no quoted price, fair value is determined using external professional valuation institution. The institutions use one or more of the following valuation techniques including DCF Model, Free Cash Flow to Equity Model, Comparable Company Analysis, Dividend Discount Model, Risk Adjusted Discount Rate Method, and Net Asset Value Method, deemed suitable considering the characteristics of the financial instruments. Loans measured at amortized cost DCF model is used to determine the fair value of loans. Fair value is determined by discounting the expected cash flows, which are contractual cash flows adjusted by the expected prepayment rate, at an appropriate discount rate. Derivatives and financial instruments at fair value through profit or loss For exchange traded derivatives, quoted price in an active market is used to determine fair value and for OTC derivatives, fair value is determined using valuation techniques. The Group uses internally developed valuation models that are widely used by market participants to determine fair values of plain vanilla OTC derivatives including options, interest rate swaps, and currency swaps, based on observable market parameters. However, some complex financial instruments are valued using appropriate models developed from generally accepted market valuation models including the Finite Difference Method (“FDM”), the MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Closed Form and Tree Model or valuation results from independent external professional valuation institution. Deposits Carrying amount of demand deposits is regarded as representative of fair value because they do not have a fixed maturity and are payable on demand. Fair value of time deposits is determined using a DCF model. Fair value is determined by discounting the expected cash flows, which are contractual cash flows adjusted by the expected prepayment rate, at an appropriate discount rate. Borrowings Carrying amount of overdraft in foreign currency is regarded as representative of fair value because they do not have a fixed maturity and are payable on demand. Fair value of other borrowings is determined using a DCF model discounting contractual future cash flows at an appropriate discount rate. Debentures Fair value is determined by using the valuation results of external professional valuation institution, which are calculated using market inputs. Other financial assets and liabilities Carrying amounts are reasonable approximation of fair values. These financial instruments are temporary accounts used for other various transactions and their maturities are relatively short or not defined. 6.1.2 Fair value hierarchy The Group believes that valuation methods used for measuring the fair values of financial instruments are reasonable and that the fair values recognized in the consolidated statement of financial position are appropriate. However, the fair values of the financial instruments recognized in the consolidated statement of financial position may be different if other valuation methods or assumptions are used. Additionally, as there is a variety of valuation techniques and assumptions used in measuring fair value, it may be difficult to reasonably compare the fair value with that of other financial institutions. The Group classifies and discloses fair value of the financial instruments into the three-level hierarchy as follows: Level 1: The fair values are based on quoted prices (unadjusted) in active markets for identical assets or liabilities that the entity can access at the measurement date. Level 2: The fair values are based on inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Level 3: The fair values are based on unobservable inputs for the asset or liability. The fair value measurement is categorized in its entirety in the same level of the fair value hierarchy as the lowest level input that is significant to the entire measurement. If an observable input requires an adjustment using an unobservable input and that adjustment results in a significantly higher or lower fair value measurement, the resulting measurement would be categorized within Level 3 of the fair value hierarchy. 6.1.2.1 Fair value hierarchy of financial assets and liabilities at fair value in the consolidated statements of financial position Fair value hierarchy of financial assets and liabilities at fair value in the consolidated statements of financial position as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value hierarchy Total Level 1 Level 2 Level 3 (In millions of Korean won) Financial assets Financial assets at fair value through profit or loss ￦ 11,177,716 ￦ 31,476,070 ￦ 10,895,300 ￦ 53,549,086 Due from financial institutions — 165,242 51,125 216,367 Debt securities 9,853,733 30,735,027 10,132,766 50,721,526 Equity securities 1,244,178 336,389 523,276 2,103,843 Loans — 239,412 188,133 427,545 Others 79,805 — — 79,805 Derivatives held for trading 72,983 2,398,831 536,784 3,008,598 Derivatives held for hedging — 182,075 — 182,075 Financial assets at fair value through other comprehensive income 15,188,993 29,764,660 1,482,398 46,436,051 Debt securities 14,236,566 29,320,282 — 43,556,848 Equity securities 952,427 69,280 1,482,398 2,504,105 Loans — 375,098 — 375,098 ￦ 26,439,692 ￦ 63,821,636 ￦ 12,914,482 ￦ 103,175,810 Financial liabilities Financial liabilities at fair value through profit or loss ￦ 2,663,327 ￦ — ￦ — ￦ 2,663,327 Financial liabilities designated at fair value through profit or loss 492 1,482,302 11,222,032 12,704,826 Derivatives held for trading 157,634 2,458,498 226,818 2,842,950 Derivatives held for hedging — 164,391 — 164,391 ￦ 2,821,453 ￦ 4,105,191 ￦ 11,448,850 ￦ 18,375,494 December 31, 2020 Fair value hierarchy Total Level 1 Level 2 Level 3* (In millions of Korean won) Financial assets Financial assets at fair value through profit or loss ￦ 14,508,028 ￦ 35,298,665 ￦ 11,228,762 ￦ 61,035,455 Due from financial institutions — 10,011 90,083 100,094 Debt securities 13,316,819 34,580,168 10,518,113 58,415,100 Equity securities 1,101,244 409,259 581,810 2,092,313 Loans — 299,227 38,756 337,983 Others 89,965 — — 89,965 Derivatives held for trading 90,459 4,678,185 441,868 5,210,512 Derivatives held for hedging — 334,873 — 334,873 Financial assets at fair value through other comprehensive income 18,731,801 40,645,505 2,447,891 61,825,197 Debt securities 18,147,167 40,309,722 — 58,456,889 Equity securities 584,634 70,357 2,419,908 3,074,899 Loans — 265,426 27,983 293,409 ￦33,330,288 ￦80,957,228 ￦14,118,521 ￦128,406,037 Financial liabilities Financial liabilities at fair value through profit or loss ￦ 2,025,951 ￦ — ￦ — ￦ 2,025,951 Financial liabilities designated at fair value through profit or loss 1,040 581,636 9,201,431 9,784,107 Derivatives held for trading 204,470 4,668,155 141,447 5,014,072 Derivatives held for hedging — 208,825 — 208,825 ￦2,231,461 ￦5,458,616 ￦9,342,878 ￦17,032,955 * Included KB Securities Co., Ltd.’s OTC derivatives consist of ￦ 635,920 million of financial assets at fair value through profit or loss (debt instruments), ￦ 9,201,431 million of financial liabilities designated at fair value through profit or loss, ￦ 441,775 million of derivative financial assets and ￦ 134,934 million of derivative financial liabilities. Valuation techniques and inputs of financial assets and liabilities classified as Level 2 and measured at fair value in the consolidated statements of financial position as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value Valuation techniques Inputs (In millions of Korean won) Financial assets Financial assets at fair value through profit or loss ￦ 31,476,070 Due from financial institutions 165,242 DCF Model, One factor Hull-White Model Discount rate, Volatility and others Debt securities 30,735,027 DCF Model, Closed Form, Option Model, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Net Asset Value Method and others Projected cash flow, Fair value of underlying asset, Dividend yield, Price of underlying asset, Interest rate, Discount rate, Volatility, Correlation coefficient and others Equity securities 336,389 DCF Model Interest rate, Discount rate and others Loans 239,412 DCF Model Interest rate, Discount rate and others Derivatives held for trading 2,398,831 DCF Model, Closed Form, FDM, Option Model, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model and others Discount rate, Underlying asset Index, Volatility, Correlation coefficient, Interest rate, Stock price, Foreign exchange rate, Dividend yield, Probability of default (PD), Credit spread and others Derivatives held for hedging 182,075 DCF Model, Closed Form, FDM and others Discount rate, Volatility, Foreign exchange rate and others Financial assets at fair value through other comprehensive income 29,764,660 Debt securities 29,320,282 DCF Model, Option Model, Market value approach Discount rate, Underlying asset Index, Volatility and others Equity securities 69,280 DCF Model, Black-Scholes Model Discount rate, Underlying asset Index, Volatility and others Loans 375,098 DCF Model Discount rate, Underlying asset Index, Volatility and others ￦ 63,821,636 Financial liabilities Financial liabilities designated at fair value through profit or loss ￦ 1,482,302 Derivatives held for trading 2,458,498 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Option Model, FDM and others Discount rate, Underlying asset Index, Volatility, Correlation coefficient, Interest rate, Stock price, Foreign exchange rate, Dividend yield, Probability of default (PD), Credit spread and others Derivatives held for hedging 164,391 DCF Model, Closed Form, FDM and others Discount rate, Volatility, Foreign exchange rate and others ￦ 4,105,191 December 31, 2020 Fair value Valuation techniques Inputs (In millions of Korean won) Financial assets Financial assets at fair value through profit or loss ￦ 35,298,665 Due from financial institutions 10,011 DCF Model Projected cash flow, Discount rate Debt securities 34,580,168 DCF Model, Closed Form, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Net Asset Value Method and others Projected cash flow, Fair value of underlying asset, Dividend yield, Price of underlying asset, Interest rate, Discount rate, Volatility, Correlation coefficient and others Equity securities 409,259 DCF Model Interest rate, Discount rate and others Loans 299,227 DCF Model Interest rate, Discount rate and others Derivatives held for trading 4,678,185 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Black-Scholes Discount rate, Underlying asset Index, Volatility, Interest rate, Stock price, Foreign exchange rate, Dividend yield and others Derivatives held for hedging 334,873 DCF Model, Closed Form, FDM and others Discount rate, Volatility, Foreign exchange rate and others Financial assets at fair value through other comprehensive income 40,645,505 Debt securities 40,309,722 DCF Model, Market value approach Discount rate, Volatility and others Equity securities 70,357 DCF Model Interest rate, Discount rate and others Loans 265,426 DCF Model Discount rate, Volatility and others ￦ 80,957,228 Financial liabilities Financial liabilities designated at fair value through profit or loss ￦ 581,636 Derivatives held for trading 4,668,155 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model and others Discount rate, Price of underlying asset, Volatility, Interest rate, Stock price, Foreign exchange rate, Dividend yield and others Derivatives held for hedging 208,825 DCF Model, Closed Form, FDM and others Discount rate, Foreign exchange rate and others ￦ 5,458,616 6.1.2.2 Fair value hierarchy of financial assets and liabilities whose fair value is disclosed Fair value hierarchy of financial assets and liabilities whose fair value is disclosed as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value hierarchy Total Level 1 Level 2 Level 3 (In millions of Korean won) Financial assets Cash and due from financial institutions 1 ￦ 3,015,104 ￦ 13,812,640 ￦ 4,007,491 ￦ 20,835,235 Loans measured at amortized cost — 372,988 340,463,896 340,836,884 Securities measured at amortized cost 9,587,770 16,979,656 3,068 26,570,494 Other financial assets 2 — — 9,147,059 9,147,059 ￦ 12,602,874 ￦ 31,165,284 ￦ 353,621,514 ￦ 397,389,672 Financial liabilities Deposits 1 ￦ — ￦ 142,021,800 ￦ 164,026,491 ￦ 306,048,291 Borrowings 3 — 1,469,263 36,339,681 37,808,944 Debentures — 46,969,992 4,588,756 51,558,748 Other financial liabilities 2 — — 22,629,587 22,629,587 ￦ — ￦ 190,461,055 ￦ 227,584,515 ￦ 418,045,570 December 31, 2020 Fair value hierarchy Total Level 1 Level 2 Level 3 (In millions of Korean won) Financial assets Cash and due from financial institutions 1 ￦ 3,362,096 ￦ 19,573,075 ￦ 2,677,102 ￦ 25,612,273 Loans measured at amortized cost — 271,241 378,520,567 378,791,808 Securities measured at amortized cost 19,438,941 18,584,264 2,868 38,026,073 Other financial assets 2 — — 14,167,689 14,167,689 ￦ 22,801,037 ￦ 38,428,580 ￦ 395,368,226 ￦ 456,597,843 Financial liabilities Deposits 1 ￦ — ￦ 181,472,846 ￦ 157,360,938 ￦ 338,833,784 Borrowings 3 — 1,149,734 48,932,166 50,081,900 Debentures — 57,916,235 5,272,897 63,189,132 Other financial liabilities 2 — — 28,612,287 28,612,287 ￦ — ￦ 240,538,815 ￦ 240,178,288 ￦ 480,717,103 1 The amounts included in Level 2 are the carrying amounts which are reasonable approximations of the fair value. 2 Other financial assets and other financial liabilities included in Level 3 are the carrying amounts which are reasonable approximation of fair value. 3 Borrowings of ￦ 4,685 million and ￦ 292 million included in Level 2 is the carrying amounts which are reasonable approximation of fair value as of December 31, 2019 and 2020, respectively. For financial assets and liabilities whose carrying amount is a reasonable approximation of fair value, valuation techniques and inputs are not disclosed. Valuation techniques and inputs of financial assets and liabilities classified as Level 2, and whose fair value is disclosed as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value Valuation techniques Inputs (In millions of Korean won) Financial assets Loans measured at amortized cost ￦ 372,988 DCF Model Discount rate Securities measured at amortized cost 16,979,656 DCF Model, MonteCarlo Simulation Discount rate, ￦ 17,352,644 Financial liabilities Borrowings ￦ 1,464,578 DCF Model Discount rate Debentures 46,969,992 DCF Model Discount rate ￦ 48,435,570 December 31, 2020 Fair value Valuation techniques Inputs (In millions of Korean won) Financial assets Loans measured at amortized cost ￦ 271,241 DCF Model Discount rate Securities measured at amortized cost 18,584,264 DCF Model, MonteCarlo Simulation Discount rate, ￦ 18,855,505 Financial liabilities Borrowings ￦ 1,149,442 DCF Model Discount rate Debentures 57,916,235 DCF Model Discount rate ￦ 59,065,677 Valuation techniques and inputs of financial assets and liabilities classified as Level 3 and, whose fair value is disclosed and as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value Valuation Inputs (In millions of Korean won) Financial assets Cash and due from financial institutions ￦ 4,007,491 DCF Model Credit spread, Other spread, Interest rate Loans measured at amortized cost 340,463,896 DCF Model Credit spread, Other spread, Prepayment rate, Interest rate Securities measured at amortized cost 3,068 DCF Model Interest rate ￦ 344,474,455 Financial liabilities Deposits ￦ 164,026,491 DCF Model Other spread, Prepayment rate, Interest rate Borrowings 36,339,681 DCF Model Other spread, Interest rate Debentures 4,588,756 DCF Model Other spread, Interest rate ￦ 204,954,928 December 31, 2020 Fair value Valuation Inputs ( In millions of Korean won) Financial assets Cash and due from financial institutions ￦ 2,677,102 DCF Model Credit spread, Other spread, Interest rate Loans measured at amortized cost 378,520,567 DCF Model Credit spread, Other spread, Prepayment rate, Interest rate Securities measured at amortized cost 2,868 DCF Model Interest rate ￦ 381,200,537 Financial liabilities Deposits ￦ 157,360,938 DCF Model Other spread, Prepayment rate, Interest rate Borrowings 48,932,166 DCF Model Other spread, Interest rate Debentures 5,272,897 DCF Model Other spread, Interest rate ￦ 211,566,001 6.2 Disclosure of Fair Value Hierarchy Level 3 6.2.1 Valuation policy and process of Level 3 fair value The Group uses external, independent and qualified valuation service in addition to internal valuation models to determine the fair value of the Group’s assets at the end of every reporting period. Where a reclassification between the levels of the fair value hierarchy occurs for a financial asset or liability, the Group’s policy is to recognize such transfers as having occurred at the beginning of the reporting period. 6.2.2 Changes in fair value (Level 3) measured using valuation technique based on unobservable inputs in the market 6.2.2.1 Changes in financial instruments classified as Level 3 of the fair value hierarchy for the years ended December 31, 2019 and 2020, are as follows: 2019 Financial assets at fair Financial Financial liabilities at Net derivatives Due from financial Securities Loans measured at Financial assets Financial liabilities Derivatives held for (In millions of Korean won) Beginning ￦ 48,743 ￦ 7,464,860 ￦ 213,203 ￦ 1,332,718 ￦ (10,873,383 ) ￦ (300,131 ) Total gains or losses Profit or loss 1,207 (66,208 ) 10,412 — (1,285,157 ) 851,453 Other comprehensive income (loss) 1,175 111,826 — 55,993 (25,538 ) — Purchases — 4,544,254 154,005 95,359 — — Sales — (2,139,174 ) (189,487 ) (1,672 ) — (163,856 ) Issues — — — — (12,416,402 ) (59,202 ) Settlements — — — — 13,378,448 (1,316 ) Transfers into Level 3* — 851,457 — — — (16,982 ) Transfers out of Level 3* — (110,973 ) — — — — Ending ￦ 51,125 ￦ 10,656,042 ￦ 188,133 ￦ 1,482,398 ￦ (11,222,032 ) ￦ 309,966 2020 Financial assets at fair Financial Financial liabilities at Net derivatives Due from financial Securities Loans measured at Equity securities Loans measured Financial liabilities Derivatives held for (In millions of Korean won) Beginning ￦ 51,125 ￦ 10,656,042 ￦ 188,133 ￦ 1,482,398 ￦ — ￦ (11,222,032 ) ￦ 309,966 Total gains or losses Profit or loss (2,021 ) 22,069 627 (206 ) — (406,788 ) 400,241 Other comprehensive income (loss) (7,693 ) 144,963 — 815,244 (217 ) (27,876 ) — Purchases 135,227 3,519,573 — 122,827 40,000 — (24,165 ) Sales (86,555 ) (3,263,111 ) (150,004 ) (355 ) (11,800 ) — (328,348 ) Issues — — — — — (9,333,419 ) (42,732 ) Settlements — — — — — 11,788,684 90 Transfers into Level 3* — 129,580 — — — — (1,044 ) Transfers out of Level 3* — (109,193 ) — — — — (13,587 ) Ending ￦ 90,083 ￦ 11,099,923 ￦ 38,756 ￦ 2,419,908 ￦ 27,983 ￦ (9,201,431 ) ￦ 300,421 * Changes in levels for the financial instruments occurred due to the change in the availability of observable market data. 6.2.2.2 In relation to changes in Level 3 of the fair value hierarchy, total gains or losses recognized in profit or loss for the year, and total gains or losses recognized in profit or loss from financial instruments held at the end of the reporting period for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 Net gains (losses) Other operating Net interest Net losses on Other operating Net interest (In millions of Korean won) Total gains (losses) recognized in profit or loss for the year ￦ (36,466) ￦ (405) ￦ 617 ￦ (489,703) ￦ 1,388 ￦ 22 Total gains (losses) recognized in profit or loss from financial instruments held at the end of the reporting year 144,674 (289 ) 43 (37,668 ) 1,331 — 2020 Net gains on financial Other operating Net interest income (In millions of Korean won) Total gains (losses) recognized in profit or loss for the year ￦ 70,251 ￦ (56,329 ) ￦ — Total gains (losses) recognized in profit or loss from financial instruments held at the end of the reporting year 129,824 (60,884 ) — 6.2.3 Sensitivity analysis of changes in unobservable inputs 6.2.3.1 Information about fair value measurements using unobservable inputs as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value Valuation techniques Unobservable inputs Range of Relationship of unobservable inputs to (In millions of Financial assets Financial assets at fair value through profit or loss Due from financial institutions ￦ 51,125 Option Model Volatility of the underlying asset 11.43~34.39 The higher the volatility of the underlying asset, the higher the fair value fluctuation Correlation coefficient -4.84 The higher the correlation coefficient, the higher the fair value fluctuation Debt securities 10,132,766 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull-White Model, Black-Scholes Model, Option Model, Binomial Model, Net Asset Value, Income approach, Market approach and others Growth rate -1.00~1.00 The higher the growth rate, the higher the fair value Volatility 1.00~48.00 The higher the volatility, the higher the fair value fluctuation Discount rate 0.75~17.37 The lower the discount rate, the higher the fair value Recovery rate 40.00 The higher the recovery rate, the higher the fair value Correlation coefficient between underlying assets 3.11~95.67 The higher the correlation coefficient, the higher the fair value fluctuation Liquidation value 0.00 The higher the liquidation value, the higher the fair value Volatility of real estate price -1.00~1.00 The higher the price of real estate, the higher the fair value Equity securities 523,276 Income approach, Market value approach, Asset value approach, DCF Model, Comparable Company Analysis, Risk adjusted discount rate method, Dividend Discount Model, Usage of past transactions, Binomial Model and others Growth rate 0.00~2.20 The higher the growth rate, the higher the fair value Discount rate 2.00~22.00 The lower the discount rate, the higher the fair value Liquidation value -1.00~1.00 The higher the liquidation value, the higher the fair value Volatility 11.90 The higher the volatility, the higher the fair value fluctuation Loans 188,133 Binomial Model, DCF Model Volatility of the stock price 12.91~48.28 The higher the volatility, the higher the fair value fluctuation Discount rate 10.81 The lower the discount rate, the higher the fair value Derivatives held for trading Stock and index ￦ 416,486 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Volatility of the underlying asset 9.75~52.00 The higher the volatility, the higher the fair value fluctuation Model, Black-Scholes Model, Binomial Model Correlation coefficient between underlying assets 4.00~77.00 The higher the correlation coefficient, the higher the fair value fluctuation Currency and interest rate 120,298 DCF Model, Hull-White Model Volatility 2.00~58.00 The higher the volatility, the higher the fair value fluctuation Correlation coefficient between underlying assets -49.00~90.00 The higher the absolute value of correlation coefficient, the higher the fair value fluctuation Financial assets at fair value through other comprehensive income Equity securities 1,482,398 Risk adjusted discount rate method, IMV Model, DCF Model, Comparable Company Analysis, Dividend discount model, Option Model, Net Asset value method, Market approach, One Factor Hull-White Model and others Growth rate 0.00~2.20 The higher the growth rate, the higher the fair value Discount rate 3.04~16.37 The lower the discount rate, the higher the fair value Volatility 20.97~34.87 The higher the volatility, the higher the fair value fluctuation ￦12,914,482 Financial liabilities Financial liabilities designated at fair value through profit or loss Derivative-linked securities ￦ 11,222,032 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Model, Black-Scholes Model Volatility of the underlying asset 1.00~58.00 The higher the volatility, the higher the fair value fluctuation Correlation coefficient between underlying assets -49.00~90.00 The higher the absolute value of correlation coefficient, the higher the fair value fluctuation Derivatives held for trading Stock and index 54,341 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Model, Black-Scholes Model, Binomial Model Volatility 12.00~52.00 The higher the volatility, the higher the fair value fluctuation Correlation coefficient between underlying assets 9.00~77.00 The higher the correlation coefficient, the higher the fair value fluctuation Others 172,477 MonteCarlo Simulation, Hull and White Model, DCF Model, Closed Form Volatility 2.00~58.00 The higher the volatility, the higher the fair value fluctuation Volatility of the stock price 16.28 The higher the volatility, the higher the fair value fluctuation Volatility of the interest rate 0.52 The higher the volatility, the higher the fair value fluctuation Discount rate 1.94~2.00 The higher the discount rate, the lower the fair value Correlation coefficient between underlying assets 19.00~90.00 The higher the absolute value of correlation coefficient, the higher the fair value fluctuation ￦ 11,448,850 December 31, 2020 Fair value Valuation techniques Unobservable inputs Range of Relationship of unobservable inputs to fair value (In millions of Financial assets Financial assets at fair value through profit or loss Due from financial institutions ￦ 90,083 MonteCarlo Simulation Volatility of the underlying asset 19.40 ~ 36.76 The higher the volatility of the underlying asset, the higher the fair value fluctuation Correlation coefficient 12.27 The higher the correlation coefficient, the higher the fair value fluctuation Debt securities 10,518,113 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull-White Model, Black-Scholes Model, Option Model, Binomial Model, Net Asset Value Method, Income approach, Market approach and others Growth rate 0.00 ~ 2.00 The higher the growth rate, the higher the fair value Volatility 8.00 ~ 179.75 The higher the volatility, the higher the fair value fluctuation Discount rate 0.00 ~ 21.37 The lower the discount rate, the higher the fair value Recovery rate 40 The higher the recovery rate, the higher the fair value Correlation coefficient between underlying assets -61.12 ~ 100.00 The higher the correlation coefficient, the higher the fair value fluctuation Liquidation value 0.00 The higher the liquidation value, the higher the fair value Volatility of real estate price 0.00 The higher the price of real estate, the higher the fair value Equity securities ￦ 581,810 Income approach, Market approach, Asset value approach, DCF Model, Comparable Company Analysis, Risk adjusted discount rate method, Dividend Discount Model, Usage of past transactions, Binomial Model and others Growth rate 0.00 ~ 1.10 The higher the growth rate, the higher the fair value Discount rate 0.60 ~ 18.67 The lower the discount rate, the higher the fair value Liquidation value 0.00 The higher the liquidation value, the higher the fair value Loans 38,756 Binomial Model, DCF Model Volatility of the stock price 0.00 The higher the volatility, the higher the fair value fluctuation Discount rate 7.86 The lower the discount rate, the higher the fair value Derivatives held for trading Stock and index ￦ 382,337 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Volatility of the underlying asset 20.00 ~ 72.00 The higher the volatility, the higher the fair value fluctuation Model, Black-Scholes Model, Binomial Model Correlation coefficient between underlying assets -61.12 ~ 89.01 The higher the correlation coefficient, the higher the fair value fluctuation Others 59,531 DCF Model, Hull-White Model Volatility 0.00 ~ 68.00 The higher the volatility, the higher the fair value fluctuation Correlation coefficient between underlying assets -50.48 ~ 90.95 The higher the correlation coefficient, the higher the fair value fluctuation Financial assets at fair value through other comprehensive income Equity securities 2,419,908 Risk adjusted discount rate method, IMV Model, DCF Model, Comparable Company Analysis, Dividend discount model, Option Model, Net Asset Value Method, Market approach, One Factor Hull-White Model and others Growth rate 0.00 ~ 2.00 The higher the growth rate, the higher the fair value Discount rate 7.60 ~ 19.67 The lower the discount rate, the higher the fair value Volatility 22.11 ~ 24.16 The higher the volatility, the higher the fair value fluctuation Loans 27,983 DCF Model Discount rate 2.21 ~ 4.21 The lower the discount rate, the higher the fair value ￦ 14,118,521 Financial liabilities Financial liabilities desig

Due from Financial Institutions

Due from Financial Institutions Measured at Amortized Cost	12 Months Ended
	Dec. 31, 2020
Due From Financial Institution Abstract [Abstract]
Disclosure Of Cash And Bank Balances At Central Banks Explanatory	7. Due from Financial Institutions Measured at Amortized Cost 7.1 Details of due from financial institutions as of December 31, 2019 and 2020, are as follows: Financial institutions Interest rate December 31, 2019 December 31, 2020 (In millions of Korean won) Due from financial institutions in Korean won Due from the Bank of Korea The Bank of Korea 0.00 ￦ 8,117,840 ￦ 11,242,803 Due from banking institutions Hana Bank and others 0.00 ~ 1.90 4,641,714 3,692,044 Due from others NH Investment & Securities Co., Ltd. and others 0.00 ~ 1.63 654,981 753,581 13,414,535 15,688,428 Due from financial institutions in foreign currencies Due from banking institutions in foreign currencies Wells Fargo Bank N.A. and others 0.00 ~ 3.50 2,351,929 4,215,918 Time deposits in foreign currencies Bank of Shanghai, Beijing Branch and others 0.00 ~ 7.05 1,053,776 739,637 Due from others Societe Generale (Paris) and others 0.00 ~7.70 1,327,432 2,079,371 4,733,137 7,034,926 ￦ 18,147,672 ￦ 22,723,354 * Before netting of allowance 7.2 Details of restricted due from financial institutions as of December 31, 2019 and 2020, are as follows: Financial institutions December 31, 2019 December 31, Reasons of restriction (In millions of Korean won) Due from financial institutions in Korean won Due from the Bank of Korea The Bank of Korea ￦ 8,117,840 ￦ 11,242,803 Bank of Korea Act Due from banking institutions Shinhan Bank and others 3,027,963 772,986 Net settlement and others Due from others NH Investment & Securities Co., Ltd. and others 555,294 545,457 Derivatives margin account and others 11,701,097 12,561,246 Due from financial institutions in foreign currencies Due from banking institutions in foreign currencies People’s Bank of China and others 490,071 1,097,729 Cambodian law and others Time deposits in foreign currencies Bank of Communications Co., Ltd. New York Branch 31,443 46,428 Bank Act of the State of New York and others Due from others Societe Generale (Paris) and others 1,150,355 1,597,960 Derivatives margin account and others 1,671,869 2,742,117 ￦ 13,372,966 ￦15,303,363 * Before netting of allowance 7.3 Changes in allowances for credit losses of due from financial institutions for the years ended December 31, 2019 and 2020, are as follows: 2019 12-month Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 2,019 ￦ — ￦ — Transfer between stages Transfer to 12-month — — — Transfer to lifetime expected credit losses — — — Impairment — — — Disposal — — — Provision for credit losses 1,116 1,210 360 Others 29 (22 ) — Ending ￦ 3,164 ￦ 1,188 ￦ 360 2020 12-month Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 3,164 ￦ 1,188 ￦ 360 Transfer between stages Transfer to 12-month — — — Transfer to lifetime expected credit losses — — — Impairment — — — Disposal — — — Reversal of credit losses (416 ) (1,128 ) — Business combination 154 — — Others 45 (26 ) (78 ) Ending ￦ 2,947 ￦ 34 ￦ 282

Assets pledged as collateral

Assets pledged as collateral	12 Months Ended
	Dec. 31, 2020
Pledged Assets Abstract [Abstract]
Disclosure Of Collateral Explanatory	8. Assets Pledged as Collateral 8.1 Details of assets pledged as collateral as of December 31, 2019 and 2020, are as follows: December 31, 2019 Assets pledged Pledgee Carrying amount Reasons of pledge (In millions of Due from financial institutions Korea Federation of Savings Banks and others ￦ 3,752,497 Borrowings from bank and others Financial assets at fair value through profit or loss The Korea Securities Depository and others 7,561,287 Repurchase agreements The Korea Securities Depository and others 7,745,154 Securities borrowing transactions Samsung Futures Inc. and others 1,090,495 Derivatives transactions 16,396,936 Financial assets at fair value through other comprehensive income The Korea Securities Depository and others 1,139,852 Repurchase agreements The Korea Securities Depository and others 1,168,515 Securities borrowing transactions The Bank of Korea 1,212,021 Borrowings from the Bank of Korea The Bank of Korea 653,825 Settlement risk of the Bank of Korea Samsung Futures Inc. and others 167,600 Derivatives transactions 4,341,813 Securities measured at amortized cost The Korea Securities Depository and others 581,268 Repurchase agreements The Bank of Korea 1,767,559 Borrowings from the Bank of Korea The Bank of Korea 3,077,151 Settlement risk of the Bank of Korea Samsung Futures Inc. and others 247,301 Derivatives transactions Others 494,785 Others 6,168,064 Mortgage loans Others 6,487,022 Covered bond Real estate NATIXIS REAL ESTATE CAPITAL LLC and others 1,665,368 Borrowings from bank and others ￦ 38,811,700 December 31, 2020 Assets pledged Pledgee Carrying amount Reasons of pledge (In millions of Due from financial institutions Korea Federation of Savings Banks and others ￦ 1,293,930 Borrowings from bank and others Financial assets at fair value through profit or loss The Korea Securities Depository and others 10,733,047 Repurchase agreements The Korea Securities Depository and others 7,009,580 Securities borrowing transactions Samsung Futures Inc. and others 730,774 Derivatives transactions 18,473,401 Financial assets at fair value through other comprehensive income The Korea Securities Depository and others 2,216,165 Repurchase agreements The Korea Securities Depository and others 1,322,998 Securities borrowing transactions The Bank of Korea 2,837,452 Borrowings from the Bank of Korea The Bank of Korea 1,610,691 Settlement risk of the Bank of Korea Samsung Futures Inc. and others 270,089 Derivatives transactions 8,257,395 Securities measured at amortized cost The Korea Securities Depository and others 664,438 Repurchase agreements The Bank of Korea 4,295,149 Borrowings from the Bank of Korea The Bank of Korea 3,677,922 Settlement risk of the Bank of Korea Samsung Futures Inc. and others 103,748 Derivatives transactions Others 598,187 Others 9,339,444 Mortgage loans Others 10,699,721 Covered bond Real estate LGIM COMMERCIAL LENDING Ltd and others 1,480,942 Borrowings from bank and others ￦ 49,544,833 In addition, the Group provided ￦ 7,320,220 million and ￦ 4,680,816 million of its borrowed securities and assets held as collateral to Korea Securities Finance Corporation and others as collateral as of December 31, 2019 and 2020, respectively. 8.2 Fair value of collateral available to sell or repledge, and collateral sold or repledged, regardless of debtor’s default as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value of collateral Fair value of collateral Total (In millions of Korean won) Securities ￦ 6,726,632 ￦ — ￦ 6,726,632 December 31, 2020 Fair value of collateral Fair value of collateral Total (In millions of Korean won) Securities ￦ 3,732,013 ￦ — ￦ 3,732,013

Derivative Financial Instrument

Derivative Financial Instruments and Hedge Accounting	12 Months Ended
	Dec. 31, 2020
Disclosure Of Hedge Accounting Abstract [Abstract]
Disclosure Of Hedge Accounting Explanatory	9. Derivative Financial Instruments and Hedge Accounting The Group’s derivative operations focus on addressing the needs of the Group’s corporate clients to hedge their risk exposure and hedging the Group’s risk exposure that results from such client contracts. The Group also engages in derivative trading activities to hedge the interest rate and foreign currency risk exposures that arise from the Group’s own assets and liabilities. In addition, the Group engages in proprietary trading of derivatives within the Group’s regulated open position limits. The Group provides and trades a range of derivatives products, including: • Interest rate swaps, relating to interest rate risks in Korean won • Cross-currency swaps, forwards and options relating to foreign exchange rate risks, • Stock price index options linked with the KOSPI index In particular, the Group applies fair value hedge accounting using interest rate swaps, currency forwards and others to hedge the risk of changes in fair values due to the changes in interest rate and foreign exchange rates of structured debentures in Korean won, debentures in foreign currencies, and structured deposits in foreign currencies. The Group applies cash flow hedge accounting using interest rate swaps, currency swaps and others to hedge the risk of changes in cash flows of floating rate debt securities in Korean won and borrowings in foreign currencies. In addition, the Group applies net investment in foreign operations hedge accounting by designating debentures in foreign currencies and cross currency forwards as hedging instruments to hedge foreign exchange risks on net investments in foreign operations. 9.1 Details of derivative financial instruments held for trading as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 Notional amount Assets Liabilities Notional amount Assets Liabilities (In millions of Korean won) Interest rate Forwards ￦ 570,000 ￦ 206 ￦ 84,126 ￦ 1,824,000 ￦ 50,580 ￦ 107,218 Futures* 2,951,770 698 235 4,540,235 43 1,834 Swaps 270,091,778 512,145 557,511 300,105,350 631,917 682,401 Options 17,521,156 267,697 379,262 14,779,000 248,437 302,134 291,134,704 780,746 1,021,134 321,248,585 930,977 1,093,587 Currency Forwards 87,373,417 942,632 750,380 78,255,991 1,712,560 1,986,239 Futures* 107,793 — 349 376,281 158 695 Swaps 46,501,399 606,464 610,275 49,756,478 1,897,636 1,349,919 Options 2,789,562 5,438 14,346 2,377,775 33,421 28,012 136,772,171 1,554,534 1,375,350 130,766,525 3,643,775 3,364,865 Stock and index Futures* 1,646,785 22,451 20,704 1,027,347 20,061 2,246 Swaps 6,773,467 448,803 86,100 5,434,057 423,297 123,242 Options 5,559,865 99,013 176,141 6,482,510 135,805 275,282 13,980,117 570,267 282,945 12,943,914 579,163 400,770 Credit Swaps 4,433,960 19,178 13,659 3,015,782 19,395 9,700 4,433,960 19,178 13,659 3,015,782 19,395 9,700 Commodity Futures* 3,281 68 3 11,609 151 81 Swaps 105,658 2,948 474 13,923 268 991 108,939 3,016 477 25,532 419 1,072 Other 3,160,013 80,857 149,385 1,476,310 36,783 144,076 ￦ 449,589,904 ￦ 3,008,598 ￦ 2,842,950 ￦ 469,476,648 ￦ 5,210,512 ￦ 5,014,070 * Gains or losses arising from daily mark-to-market 9.2 Average price condition of future nominal cash flows by type of hedge accounting as of December 31, 2019 and 2020, are as follows: December 31, 2019 1 year 2 years 3 years 4 years 5 years Over 5 years Total (In millions of Korean won) Fair value hedge Nominal amount of the hedging instrument ￦ 2,649,272 ￦ 1,807,950 ￦ 897,562 ￦ 309,882 ￦ 466,053 ￦ 1,414,570 ￦ 7,545,289 Average price condition (%) 2.29 2.70 2.29 3.16 2.50 3.92 2.91 Average price condition (USD/KRW) 1,149.90 1,138.82 1,094.35 — — — 1,146.84 Average price condition (EUR/KRW) 1,319.66 1,346.38 — — — — 1,327.68 Average price condition (AUD/KRW) 803.71 — — — — — 803.71 Cash flow hedge Nominal amount of the hedging instrument ￦ 2,450,918 ￦ 1,199,124 ￦ 1,764,991 ￦ 529,202 ￦ 120,000 ￦ 150,000 ￦ 6,214,235 Average price condition (%) 2.64 2.56 2.66 2.79 2.00 1.67 2.59 Average price condition (USD/KRW) 1,129.58 1,111.66 1,153.15 1,095.73 — — 1,132.99 Average price condition (EUR/KRW) 1,305.22 1,306.76 1,312.75 — — — 1,306.91 Average price condition (AUD/KRW) — 837.00 — — — — 837.00 Average price condition (SGD/KRW) 815.80 831.49 — — — — 823.54 Hedge of net investments in foreign operations Nominal amount of the hedging instrument ￦ 248,233 ￦ — ￦ 27,336 ￦ — ￦ — ￦ — ￦ 275,569 Average price condition (USD/KRW) 1,151.49 — — — — — 1,151.49 Average price condition (GBP/KRW) — — 1,465.26 — — — 1,465.26 December 31, 2020 1 year 2 years 3 years 4 years 5 years Over 5 years Total (In millions of Korean won) Fair value hedge Nominal amount of the hedging instrument ￦ 5,266,994 ￦ 1,083,877 ￦ 512,608 ￦ 620,788 ￦ 1,462,964 ￦ 2,442,692 ￦ 11,389,923 Average price condition (%) 0.76 0.81 1.00 1.07 1.21 1.14 0.97 Average price condition (USD/KRW) 1,160.33 1,115.45 1,151.50 — — — 1,157.28 Average price condition (EUR/KRW) 1,353.28 — 1,366.30 — — — 1,353.36 Average price condition (AUD/KRW) 835.43 — — — — — 835.43 Average price condition (GBP/KRW) 1,546.54 — — — — — 1,546.54 Cash flow hedge Nominal amount of the hedging instrument ￦ 2,568,922 ￦ 1,767,357 ￦ 1,277,053 ￦ 166,643 ￦ 509,940 ￦ 100,000 ￦ 6,389,915 Average price condition (%) 0.83 1.66 2.48 2.00 1.63 1.67 1.36 Average price condition (USD/KRW) 1,113.33 1,160.46 1,181.36 1,128.30 1,142.05 — 1,152.37 Average price condition (EUR/KRW) 1,306.76 1,312.75 1,321.00 — 1,340.64 — 1,312.93 Average price condition (AUD/KRW) 837.00 — — — — — 837.00 Average price condition (SGD/KRW) 831.49 — 866.14 — — — 858.33 Hedge of net investments in foreign operations Nominal amount of the hedging instrument ￦ 217,274 ￦ 26,683 ￦ — ￦ — ￦ — ￦ — ￦ 243,957 Average price condition (USD/KRW) 1,111.45 — — — — — 1,111.45 Average price condition (GBP/KRW) — 1,465.26 — — — — 1,465.26 9.3 Fair Value Hedge 9.3.1 Details of fair value hedged items as of and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019 2019 Carrying amount Accumulated amount of Changes in fair value Assets Liabilities Assets Liabilities (In millions of Korean won) Hedge accounting Interest rate Debt securities in Korean won ￦ 549,526 ￦ — ￦ 5,485 ￦ — ￦ 5,502 Debt securities in foreign currencies 1,670,838 — 19,243 — 25,540 Deposits in foreign currencies — 780,491 — (18,391 ) (62,439 ) Debentures in Korean won — 351,070 — 21,070 (1,818 ) Debentures in foreign currencies — 2,067,556 — 41,406 (65,480 ) 2,220,364 3,199,117 24,728 44,085 (98,695 ) Currency Debt securities in foreign currencies 2,339,239 — 24,181 — 61,133 2,339,239 — 24,181 — 61,133 ￦ 4,559,603 ￦ 3,199,117 ￦ 48,909 ￦ 44,085 ￦ (37,562 ) December 31, 2020 2020 Carrying amount Accumulated amount of Changes in fair value Assets Liabilities Assets Liabilities (In millions of Korean won) Hedge accounting Interest rate Debt securities in Korean won ￦ 1,001,957 ￦ — ￦ 5,888 ￦ — ￦ 402 Debt securities in foreign currencies 2,712,980 — 62,922 — 42,382 Deposits in foreign currencies — 121,768 — 2,088 (4,491 ) Debentures in Korean won — 3,623,161 — (6,839 ) 27,909 Debentures in foreign currencies — 1,985,333 — 81,333 (37,438 ) 3,714,937 5,730,262 68,810 76,582 28,764 Currency Debt securities in foreign currencies 2,669,410 — 310,745 — (40,710 ) 2,669,410 — 310,745 — (40,710 ) ￦ 6,384,347 ￦ 5,730,262 ￦ 379,555 ￦ 76,582 ￦ (11,946 ) 9.3.2 Details of derivative instruments designated as fair value hedge as of and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019 2019 Notional amount Assets Liabilities Changes in fair value (In millions of Korean won) Interest rate Swaps ￦ 5,326,500 ￦ 129,085 ￦ 29,676 ￦ 101,448 Currency Forwards 2,218,789 22,503 27,862 (74,372) ￦ 7,545,289 ￦ 151,588 ￦ 57,538 ￦ 27,076 December 31, 2020 2020 Notional amount Assets Liabilities Changes in fair value (In millions of Korean won) Interest rate Swaps ￦ 9,217,731 ￦ 158,914 ￦ 51,842 ￦ (23,022 ) Currency Forwards 2,172,192 128,038 2,616 97,394 ￦ 11,389,923 ￦ 286,952 ￦ 54,458 ￦ 74,372 9.3.3 Details of hedge ineffectiveness recognized in profit or loss from derivatives for the years ended December 31, 2018, 2019 and 2020, are as follows: Hedge ineffectiveness recognized in profit or loss (In millions of Korean won) 2018 2019 2020 Hedge accounting Interest rate ￦ 1,186 ￦ 2,753 ￦ 5,742 Currency (20,694 ) (13,239 ) 56,684 ￦ (19,508 ) ￦ (10,486 ) ￦ 62,426 9.3.4 Gains or losses from fair value hedging instruments and hedged items attributable to the hedged risk for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Gains (losses) on hedging instruments ￦ (160,416 ) ￦ 34,070 ￦ 89,179 Gains (losses) on the hedged items attributable to the hedged risk 135,556 (44,655 ) (26,899 ) ￦ (24,860 ) ￦ (10,585 ) ￦ 62,280 9.4 Cash Flow Hedge 9.4.1 Details of cash flow hedged items as of and for the years ended December 31, 2019 and 2020, are as follows: Cash flow hedge reserve Changes in fair value December 31, 2019 December 31, 2020 2019 2020 (In millions of Korean won) Hedge accounting Interest rate risk ￦ (15,670 ) ￦ (22,439 ) ￦ 25,671 ￦ 12,172 Foreign currency change risk (11,663 ) (6,158 ) 42,357 1,065 ￦ (27,333 ) ￦ (28,597 ) ￦ 68,028 ￦ 13,237 9.4.2 Details of derivative instruments designated as cash flow hedge as of and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019 2019 Notional Assets Liabilities Changes in fair value (In millions of Korean won) Interest rate Swaps ￦ 3,600,334 ￦ 3,698 ￦ 28,484 ￦ (25,997 ) Currency Swaps 2,613,901 23,382 73,067 (38,534 ) ￦ 6,214,235 ￦ 27,080 ￦ 101,551 ￦ (64,531 ) December 31, 2020 2020 Notional Assets Liabilities Changes in fair value (In millions of Korean won) Interest rate Swaps ￦ 3,532,480 ￦ 1,286 ￦ 37,120 ￦ (11,940 ) Currency Swaps 2,857,435 40,835 116,124 (43,300 ) ￦ 6,389,915 ￦ 42,121 ￦ 153,244 ￦ (55,240 ) 9.4.3 Gains or losses from cash flow hedging instruments and hedged items attributable to the hedged risk for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Losses on hedging instruments ￦ (23,022) ￦ (64,531) ￦ (55,240) Effective portion of losses on cash flow hedging instruments (amount recognized in other comprehensive income) (24,672 ) (65,323 ) (48,034 ) Ineffective portion of losses on cash flow hedging instruments (amount recognized in profit or loss) 1,650 792 (7,206 ) 9.4.4 Amounts recognized in other comprehensive income (loss) and reclassified from equity to profit or loss for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Other comprehensive loss ￦ (24,672 ) ￦ (65,323 ) ￦ (48,034 ) Reclassification to profit or loss 15,234 21,604 39,190 Income tax effect 400 10,537 7,580 ￦ (9,038 ) ￦ (33,182 ) ￦ (1,264 ) 9.5 Hedge of Net Investments in Foreign Operations 9.5.1 Details of net investments in foreign operations hedged items as of and for the years ended December 31, 2019 and 2020, are as follows: Foreign currency translation reserve Changes in fair value December 31, 2019 December 31, 2020 2019 2020 (In millions of Korean won) Hedge accounting Currency (foreign currency exchange risk) ￦ (41,992 ) ￦ 22,278 ￦ 13,410 ￦ (88,769 ) 9.5.2 Details of financial instruments designated as hedge of net investments in foreign operations as of and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019 2019 Notional Amount Assets Liabilities Changes in fair value (In millions of Korean won) Currency Forwards ￦ 275,569 ￦ 3,407 ￦ 5,302 ￦ (10,330 ) Debentures in foreign currencies 97,255 — 97,255 (3,080 ) ￦ 372,824 ￦ 3,407 ￦ 102,557 ￦ (13,410 ) December 31, 2020 2020 Notional amount Assets Liabilities Changes in fair value (In millions of Korean won) Currency Forwards ￦ 243,957 ￦ 5,800 ￦ 1,125 ￦ 14,406 Debentures in foreign currencies 842,112 — 842,112 74,363 ￦ 1,086,069 ￦ 5,800 ￦ 843,237 ￦ 88,769 9.5.3 Fair value of non-derivative December 31, 2019 December 31, 2020 (In millions of Korean won) Debentures in foreign currencies ￦ 97,737 ￦ 852,570 9.5.4 Gains or losses from hedging instruments in hedge of net investments in foreign operations and hedged items attributable to the hedged risk for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Gains (losses) on hedging instruments ￦ (25,096 ) ￦ (13,410 ) ￦ 88,769 Effective portion of gains (losses) on hedge of net investments in foreign operations (amount recognized in other comprehensive income) (25,096 ) (13,410 ) 88,769 Ineffective portion of gains (losses) on hedge of net investments in foreign operations (amount recognized in profit or loss) — — — 9.5.5 Effective portion of gains or losses on hedging instruments recognized in other comprehensive income for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Other comprehensive income (loss) ￦ (25,096 ) ￦ (13,410 ) ￦ 88,769 Reclassification to profit or loss (12,330 ) 1,316 — Income tax effect 10,292 3,194 (24,500 ) Other comprehensive income (loss) after tax ￦ (27,134 ) ￦ (8,900 ) ￦ 64,269 9.6 Interest Rate Benchmark Reform The Group’s exposure to hedging relationships related to the interest rate benchmark reform as of December 31, 2020, is as follows. The USD LIBOR interest rate will be replaced by the Secured Overnight Financing Rate (“SOFR”) based on actual transactions starting in 2022 and the KRW CD rate is currently under consideration for improving the calculation methodology. In this hedging relationship, the Group assumed that the spread to be changed on a SOFR basis in 2022 would be similar to that included in the interest rate swap used as a hedging instrument, and no other changes were assumed. December 31, 2020 Interest rate benchmark Currency Carrying amount of non-derivative assets Carrying amount of non-derivative liabilities Notional amount of (In millions of Korean won and millions of US dollars) CD#3M KRW 1,807,701 3,623,161 5,430,000 USD#LIBOR#3M USD 78,083 3,276 82,907 USD#LIBOR#6M USD 213 10 206

Loans Measured at Amortized Cos

Loans Measured at Amortized Cost	12 Months Ended
	Dec. 31, 2020
Trade And Other Receivables Abstract [Abstract]
Disclosure Of Trade And Other Receivables Explanatory	10. Loans Measured at Amortized Cost 10.1 Details of loans as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Loans measured at amortized cost ￦ 341,363,805 ￦ 379,734,020 Deferred loan origination fees and costs 728,270 716,327 Less: Allowances for credit losses (2,408,016 ) (3,283,363 ) Carrying amount ￦ 339,684,059 ￦ 377,166,984 10.2 Details of loans to banks as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Loans measured at amortized cost ￦ 4,011,246 ￦ 5,577,728 Less: Allowances for credit losses (432 ) (682 ) Carrying amount ￦ 4,010,814 ￦ 5,577,046 10.3 Details of loan types and customer types of loans to customers other than banks as of December 31, 2019 and 2020, are as follows: December 31, 2019 Retail Corporate Credit card Total (In millions of Korean won) Loans in Korean won ￦ 159,232,495 ￦ 130,383,260 ￦ — ￦ 289,615,755 Loans in foreign currencies 433,399 8,125,029 — 8,558,428 Domestic import usance bills — 2,617,862 — 2,617,862 Off-shore — 1,387,798 — 1,387,798 Call loans — 610,001 — 610,001 Bills bought in Korean won — 2,843 — 2,843 Bills bought in foreign currencies — 2,158,877 — 2,158,877 Guarantee payments under acceptances and guarantees 36 3,312 — 3,348 Credit card receivables in Korean won — — 18,642,111 18,642,111 Credit card receivables in foreign currencies — — 6,299 6,299 Bonds purchased under repurchase agreements — 6,149,458 — 6,149,458 Privately placed bonds — 971,414 — 971,414 Factored receivables 117 167 — 284 Lease receivables 1,385,617 194,576 — 1,580,193 Loans for installment credit 5,737,458 38,700 — 5,776,158 166,789,122 152,643,297 18,648,410 338,080,829 Proportion (%) 49.33 45.15 5.52 100.00 Less: Allowances for credit losses (711,322 ) (956,554 ) (739,708 ) (2,407,584 ) ￦ 166,077,800 ￦ 151,686,743 ￦ 17,908,702 ￦ 335,673,245 December 31, 2020 Retail Corporate Credit card Total (In millions of Korean won) Loans in Korean won ￦ 175,062,187 ￦ 142,812,751 ￦ — ￦ 317,874,938 Loans in foreign currencies 3,092,630 16,159,722 — 19,252,352 Domestic import usance bills — 2,152,059 — 2,152,059 Off-shore — 1,203,737 — 1,203,737 Call loans — 1,582,251 — 1,582,251 Bills bought in Korean won — 1,620 — 1,620 Bills bought in foreign currencies — 1,739,262 — 1,739,262 Guarantee payments under acceptances and guarantees 10 8,011 — 8,021 Credit card receivables in Korean won — — 18,734,560 18,734,560 Credit card receivables in foreign currencies — — 63,071 63,071 Bonds purchased under repurchase agreements — 3,175,080 — 3,175,080 Privately placed bonds — 1,154,162 — 1,154,162 Factored receivables 104 3 — 107 Lease receivables 1,105,001 335,582 — 1,440,583 Loans for installment credit 6,440,521 50,295 — 6,490,816 185,700,453 170,374,535 18,797,631 374,872,619 Proportion (%) 49.54 45.45 5.01 100.00 Less: Allowances for credit losses (910,088 ) (1,671,098 ) (701,495 ) (3,282,681 ) ￦ 184,790,365 ￦ 168,703,437 ￦ 18,096,136 ￦ 371,589,938 10.4 Changes in deferred loan origination fees and costs for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Increase Decrease Others Ending (In millions of Korean won) Deferred loan origination costs Loans in Korean won ￦ 664,237 ￦ 387,420 ￦ (406,352 ) ￦ — ￦ 645,305 Others 119,780 56,030 (79,432 ) — 96,378 784,017 443,450 (485,784 ) — 741,683 Deferred loan origination fees Loans in Korean won 9,055 7,238 (7,693 ) — 8,600 Others 21,836 3,415 (20,439 ) 1 4,813 30,891 10,653 (28,132 ) 1 13,413 ￦ 753,126 ￦ 432,797 ￦ (457,652 ) ￦ (1 ) ￦ 728,270 2020 Beginning Increase Decrease Business combination Others Ending (In millions of Korean won) Deferred loan origination costs Loans in Korean won ￦ 645,305 ￦ 502,044 ￦ (473,392 ) ￦ — ￦ — ￦ 673,957 Others 1 96,378 53,345 (63,509 ) 9,376 — 95,590 741,683 555,389 (536,901 ) 9,376 — 769,547 Deferred loan origination fees Loans in Korean won 8,600 6,681 (6,133 ) — — 9,148 Others 2 4,813 21,636 (26,396 ) 48,117 (4,098 ) 44,072 13,413 28,317 (32,529 ) 48,117 (4,098 ) 53,220 ￦ 728,270 ￦ 527,072 ￦ (504,372 ) ￦ (38,741 ) ￦ 4,098 ￦ 716,327 1 Includes deferred loan origination costs to credit card receivables, loans for installment credit and financial lease receivables. 2 Includes deferred loan origination fees to loans in foreign currencies from PT Bank Bukopin TBK and PRASAC Microfinance Institution Limited.

Allowances for Credit Losses

Allowances for Credit Losses	12 Months Ended
	Dec. 31, 2020
Reconciliation Of Changes In Allowance Account For Credit Losses Of Financial Assets Abstract [Abstract]
Disclosure Of Allowance For Credit Losses Explanatory	11. Allowances for Credit Losses 11.1 Changes in allowances for credit losses of loans measured at amortized cost for the years ended December 31, 2019 and 2020, are as follows: 2019 Retail Corporate Credit card 12-month Lifetime expected credit 12-month Lifetime expected credit 12-month Lifetime expected credit Non-impaired Impaired Non-impaired Impaired Non-impaired Impaired (In millions of Korean won) Beginning ￦ 237,440 ￦ 215,743 ￦ 189,714 ￦ 214,312 ￦ 318,656 ￦ 722,875 ￦ 180,467 ￦ 290,025 ￦ 240,449 Transfer between stages Transfer to 12-month 168,460 (167,957 ) (503 ) 59,848 (46,312 ) (13,536 ) 51,542 (50,627 ) (915 ) Transfer to lifetime expected credit losses (144,590 ) 160,509 (15,919 ) (53,696 ) 141,398 (87,702 ) (23,537 ) 24,529 (992 ) Impairment (1,619 ) (54,736 ) 56,355 (2,250 ) (36,656 ) 38,906 (2,388 ) (14,377 ) 16,765 Write-offs (2 ) 24 (443,034 ) — 2 (239,319 ) — — (506,255 ) Sales (486 ) (70 ) (782 ) — — (8,909 ) — — — Provision (reversal) for credit losses 1,2 19,152 71,231 424,758 (3,540 ) (89,234 ) 80,216 3,567 16,633 524,652 Others (exchange differences, etc.) 25 161 (2,552 ) 395 2,456 (40,924 ) — — (9,830 ) Ending ￦ 278,380 ￦ 224,905 ￦ 208,037 ￦ 215,069 ￦ 290,310 ￦ 451,607 ￦ 209,651 ￦ 266,183 ￦ 263,874 2020 Retail Corporate Credit card 12-month Lifetime expected credit losses 12-month Lifetime expected credit losses 12-month Lifetime expected credit losses Non-impaired Impaired Non-impaired Impaired Non-impaired Impaired (In millions of Korean won) Beginning ￦ 278,380 ￦ 224,905 ￦ 208,037 ￦ 215,069 ￦ 290,310 ￦ 451,607 ￦ 209,651 ￦ 266,183 ￦ 263,874 Transfer between stages Transfer to 12-month 123,666 (121,970 ) (1,696 ) 119,723 (111,708 ) (8,015 ) 48,959 (47,611 ) (1,348 ) Transfer to lifetime expected credit losses (91,410 ) 182,076 (90,666 ) (56,655 ) 146,690 (90,035 ) (25,227 ) 26,379 (1,152 ) Impairment (3,301 ) (131,852 ) 135,153 (3,365 ) (48,773 ) 52,138 (2,273 ) (13,657 ) 15,930 Write-offs — (5 ) (460,734 ) — (1 ) (321,583 ) — — (502,275 ) Sales (1,561 ) (99 ) (1,131 ) (8 ) — (21,069 ) — — — Provision (reversal) for credit losses 1,2,3 49,459 78,413 428,220 (2,059 ) 113,335 180,162 (26,042 ) 2,925 496,162 Business combination 50,664 9,545 53,532 99,824 24,303 668,426 89 — 4,409 Others (exchange differences, etc.) (2,092 ) (435 ) (5,010 ) (3,747 ) (3,219 ) (19,570 ) — — (13,481 ) Ending ￦ 403,805 ￦ 240,578 ￦ 265,705 ￦ 368,782 ￦ 410,937 ￦ 892,061 ￦ 205,157 ￦ 234,219 ￦ 262,119 1 Provision for credit losses in the consolidated statements of comprehensive income also include provision (reversal) for credit losses of due from financial institutions (Note 7.3), and provision (reversal) for credit losses of financial investments (Note 12.5), provision for credit losses of unused commitments and guarantees (Note 24.2), provision (reversal) for credit losses of financial guarantees contracts (Note 24.3), and provision (reversal) for credit losses of other financial assets (Note 19.2). 2 Includes ￦ 390,041 million and ￦ 379,179 million of collections from written-off 3 Includes additional provision of ￦ 43,777 million for industries and borrowers which are highly affected by COVID-19, (non-impaired) The Group manages the written-off 11.2 Changes in gross carrying amount of loans for the years ended December 31, 2019 and 2020, are as follows: 2019 12-month credit losses Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 293,296,370 ￦ 26,417,165 ￦ 2,097,749 Transfer between stages Transfer to 12-month 54,530,173 (54,412,664 ) (117,509 ) Transfer to lifetime expected credit losses (non-impaired) (57,514,696 ) 58,078,679 (563,983 ) Transfer to lifetime expected credit losses (impaired) (564,375 ) (1,792,641 ) 2,357,016 Write-offs (2 ) 26 (1,188,608 ) Sales (889,880 ) (18,163 ) (188,080 ) Net increase (decrease) (execution, repayment and others) 27,519,419 (4,458,294 ) (495,627 ) Ending ￦ 316,377,009 ￦ 23,814,108 ￦ 1,900,958 2020 12-month credit losses Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 316,377,009 ￦ 23,814,108 ￦ 1,900,958 Transfer between stages Transfer to 12-month 26,751,021 (26,629,210 ) (121,811 ) Transfer to lifetime expected credit losses (non-impaired) (33,475,491 ) 34,603,648 (1,128,157 ) Transfer to lifetime expected credit losses (impaired) (596,861 ) (2,287,196 ) 2,884,057 Write-offs — (6 ) (1,284,592 ) Sales (4,324,146 ) (20,907 ) (200,182 ) Business combination 7,029,580 570,710 1,711,823 Net increase (decrease) (execution, repayment and others) 36,757,668 (1,546,945 ) (334,731 ) Ending ￦ 348,518,780 ￦ 28,504,202 ￦ 3,427,365

Financial Assets at Fair Value

Financial Assets at Fair Value through Profit or Loss and Financial Investments	12 Months Ended
	Dec. 31, 2020
Financial assets at fair value through profit or loss [Abstract]
Disclosure Of Financial Assets At Fair Value Through Profit Or Loss Explanatory	12. Financial Assets at Fair Value through Profit or Loss and Financial Investments 12.1 Details of financial assets at fair value through profit or loss and financial investments as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Financial assets at fair value through profit or loss Debt securities: Government and public bonds ￦ 6,569,472 ￦ 9,315,317 Financial bonds 16,360,495 17,897,348 Corporate bonds 3,218,480 3,997,753 Asset-backed securities 124,898 236,130 Beneficiary certificates 12,375,326 14,200,802 Derivatives linked securities 3,623,648 2,218,502 Other debt securities 8,449,207 10,549,248 Equity securities: Stocks 1,716,149 1,632,619 Other equity securities 387,694 459,694 Loans: Privately placed bonds 265,499 212,021 Other loans 162,046 125,962 Due from financial institutions: Other due from financial institutions 216,367 100,094 Others 79,805 89,965 ￦ 53,549,086 ￦ 61,035,455 Financial Investments Financial assets at fair value through other comprehensive income Debt securities: Government and public bonds ￦ 9,501,642 ￦ 14,735,340 Financial bonds 20,913,361 23,194,387 Corporate bonds 12,289,820 18,721,327 Asset-backed securities 832,160 1,795,840 Other debt securities 19,865 9,995 Equity securities: Stocks 2,377,994 2,852,158 Equity investments 41,042 37,602 Other equity securities 85,069 185,139 Loans: Privately placed bonds 375,098 265,426 Other loans — 27,983 46,436,051 61,825,197 Financial assets at amortized cost Debt securities: Government and public bonds 5,395,720 17,193,289 Financial bonds 8,157,428 5,678,949 Corporate bonds 7,536,805 8,181,961 Asset-backed securities 4,258,274 5,788,587 Other debt securities — 30,392 Allowances for credit losses (1,672 ) (2,949 ) 25,346,555 36,870,229 ￦ 71,782,606 ￦ 98,695,426 12.2 Dividend income from equity securities designated at fair value through other comprehensive income for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 From the financial assets From the remaining financial assets From the financial assets From the (In millions of Korean won) Equity securities measured at fair value through other comprehensive income Stocks Listed ￦ — ￦ 26,121 ￦ 7,000 ￦ 11,843 Unlisted — 25,599 — 22,241 Equity investments — 95 — 285 Other equity securities — 2,953 — 3,755 ￦ — ￦ 54,768 ￦ 7,000 ￦ 38,124 12.3 Derecognized equity securities measured at fair value through other comprehensive income for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 Disposal price Accumulated disposal date Disposal price Accumulated disposal date (In millions of Korean won) Equity securities measured at fair value through other comprehensive income Stocks Listed ￦ 18,342 ￦ (25,652 ) ￦ 516,883 ￦ 326,394 Unlisted 1,671 169 13 13 Equity investments — — 3 3 ￦ 20,013 ￦ (25,483 ) ￦ 516,899 ￦ 326,410 12.4 Provision (reversal) for credit losses of financial investments for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 Provision Reversal Total (In millions of Korean won) Securities measured at fair value through other comprehensive income ￦ 860 ￦ (873 ) ￦ (13 ) Loans measured at fair value through other comprehensive income 963 (826 ) 137 Securities measured at amortized cost 296 (282 ) 14 ￦ 2,119 ￦ (1,981 ) ￦ 138 2019 Provision Reversal Total (In millions of Korean won) Securities measured at fair value through other comprehensive income ￦ 1,537 ￦ (1,144 ) ￦ 393 Loans measured at fair value through other comprehensive income 170 (982 ) (812 ) Securities measured at amortized cost 216 (280 ) (64 ) ￦ 1,923 ￦ (2,406 ) ￦ (483 ) 2020 Provision Reversal Total (In millions of Korean won) Securities measured at fair value through other comprehensive income ￦ 4,297 ￦ (229 ) ￦ 4,068 Loans measured at fair value through other comprehensive income 202 (316 ) (114 ) Securities measured at amortized cost 1,916 (636 ) 1,280 ￦ 6,415 ￦ (1,181 ) ￦ 5,234 12.5 Changes in allowances for credit losses of financial investments for the years ended December 31, 2019 and 2020, are as follows: 2019 12-month expected credit losses Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 5,657 ￦ 192 ￦ 322 Transfer between stages Transfer to 12-month 437 (188 ) (249 ) Transfer to lifetime expected credit losses (669 ) 669 — Sales (329 ) — — Provision (reversal) for credit losses 219 (702 ) — Others 55 29 (73 ) Ending ￦ 5,370 ￦ — ￦ — 2020 12-month expected credit losses Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 5,370 ￦ — ￦ — Transfer between stages Transfer to 12-month — — — Transfer to lifetime expected credit losses — — — Sales (589 ) — — Provision for credit losses 5,195 39 — Others (68 ) — 73 Ending ￦ 9,908 ￦ 39 ￦ 73

Investments in Associates and J

Investments in Associates and Joint Ventures	12 Months Ended
	Dec. 31, 2020
Disclosure Of Significant Investments In Associates Abstract [Abstract]
Disclosure Of Significant Investments In Associates Explanatory	13. Investments in Associates and Joint Ventures 13.1 Investments in associates and joint ventures as of December 31, 2019 and 2020, are as follows: December 31, 2019 Ownership Acquisition Share of net Carrying Industry Location (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 1 15.19 ￦ 1,137 ￦ 1,705 ￦ 1,705 Investment finance Korea KB GwS Private Securities Investment Trust 26.74 113,880 138,013 136,168 Investment finance Korea KB-KDBC Pre-IPO 2 66.66 20,000 18,988 18,988 Investment finance Korea KB Star Office Private Real Estate Investment Trust No.1 21.05 20,000 19,839 19,839 Investment finance Korea PT Bank Bukopin TBK 22.00 116,422 115,321 121,381 Banking and foreign exchange transaction Indonesia Balhae Infrastructure Company 1 12.61 105,214 101,391 101,391 Investment finance Korea Aju Good Technology Venture Fund 38.46 19,998 23,016 23,016 Investment finance Korea SY Auto Capital Co., Ltd. 49.00 9,800 17,736 12,725 Installment loan Korea Incheon Bridge Co., Ltd. 1 14.99 9,158 (14,746 ) — Operation of highways and related facilities Korea Big Dipper Co., Ltd. 29.33 440 10 125 Research, consulting and big data Korea Paycoms Co., Ltd. 3 11.70 800 17 45 System software publishing Korea Food Factory Co., Ltd. 4 22.22 1,000 398 1,000 Farm product distribution industry Korea KBSP Private Equity Fund No.4 1 14.95 6,100 5,904 5,904 Investment finance Korea KB Private Equity Fund No.3 1 15.69 8,000 7,754 7,754 Investment finance Korea Korea Credit Bureau Co., Ltd. 1 9.00 4,500 5,991 5,991 Credit information Korea KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 25.00 12,970 13,616 13,616 Investment finance Korea Keystone-Hyundai Securities No.1 Private Equity Fund 1 4.49 1,908 1,625 1,625 Investment finance Korea KB Social Impact Investment Fund 30.00 1,500 1,465 1,465 Investment finance Korea KB-Solidus 43.33 42,697 45,021 45,718 Investment finance Korea POSCO-KB 31.25 7,500 6,847 6,847 Investment finance Korea KB-TS 2 56.00 19,824 19,731 19,731 Investment finance Korea KB-Brain Scale-up 2 42.55 21,250 20,504 19,752 Investment finance Korea KB-SJ 1 18.52 3,000 2,761 2,761 Investment finance Korea UNION Media Commerce Fund 28.99 1,000 961 961 Investment Korea KB-Stonebridge 1 14.56 5,215 4,944 4,944 Investment finance Korea KB SPROTT Renewable Private Equity Fund No.1 37.69 1,667 1,295 1,295 Investment finance Korea KB-UTC 44.29 450 417 417 Investment finance Korea APRO Co., Ltd. 1 15.19 1,500 2,565 2,790 Manufacture of electric power storage system Korea GH Real Estate I LP 42.00 17,678 19,042 19,042 Asset management Guernsey Others 2,505 2,243 1,244 ￦ 577,113 ￦ 584,374 ￦ 598,240 December 31, 2020 Ownership Acquisition Share of net Carrying Industry Location (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 1 15.19 ￦ 551 ￦ 1,279 ￦ 1,279 Investment finance Korea KB GwS Private Securities Investment Trust 26.74 113,880 142,799 141,359 Investment finance Korea KB-KDBC Pre-IPO 2 66.66 13,601 16,042 16,042 Investment finance Korea KB Star Office Private Real Estate Investment Trust No.1 21.05 20,000 20,413 20,066 Investment finance Korea Balhae Infrastructure Company 1 12.61 106,107 106,624 106,624 Investment finance Korea Aju Good Technology Venture Fund 38.46 17,113 21,351 21,348 Investment finance Korea SY Auto Capital Co., Ltd. 49.00 9,800 18,713 16,144 Installment loan Korea Incheon Bridge Co., Ltd. 1 14.99 9,158 (18,100 ) — Operation of highways and related facilities Korea Big Dipper Co., Ltd. 25.14 440 (5 ) — Research, consulting and big data Korea Paycoms Co., Ltd. 3 11.70 800 72 198 System software publishing Korea Food Factory Co., Ltd. 4 22.22 1,000 632 1,281 Farm product distribution industry Korea KBSP Private Equity Fund No.4 1 14.95 6,100 5,950 5,950 Investment finance Korea KB Private Equity Fund No.3 1 15.69 — 94 94 Investment finance Korea Korea Credit Bureau Co., Ltd. 1 9.00 4,500 7,153 7,153 Credit information Korea KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 25.00 9,739 9,845 9,845 Investment finance Korea Keystone-Hyundai Securities No.1 Private Equity Fund 1 4.49 1,908 1,556 1,556 Investment finance Korea KB Social Impact Investment Fund 30.00 3,000 2,874 2,874 Investment finance Korea KB-Solidus 43.33 48,677 45,516 46,213 Investment finance Korea POSCO-KB 31.25 10,375 12,895 12,895 Investment finance Korea KB-TS 2 56.00 16,576 17,630 17,630 Investment finance Korea KB-Brain Scale-up 2 42.55 26,050 27,513 26,763 Investment finance Korea KB-SJ 1 18.52 4,500 4,133 4,133 Investment finance Korea UNION Media Commerce Fund 28.99 1,000 960 960 Investment Korea KB-Stonebridge 1 14.56 14,308 16,636 16,636 Investment finance Korea KB SPROTT Renewable Private Equity Fund No.1 37.69 5,795 5,049 5,049 Investment finance Korea KB-UTC 44.29 17,416 16,999 16,999 Investment finance Korea WJ Private Equity Fund No.1 26.95 10,000 9,711 9,711 Investment finance Korea All Together Korea Fund No.2 99.99 10,000 10,023 10,023 Asset management Korea KB-NAU 1 12.00 5,700 5,611 5,611 Asset management Korea JR GLOBAL REIT 26.07 215,854 215,854 215,854 Real estate management Korea Project Vanilla Co., Ltd. 49.00 2,450 2,151 2,151 System software publishing Korea December & Company Inc. 1 17.63 24,849 24,402 24,402 System software publishing Korea 2020 KB Fintech Renaissance Fund 1 5.05 550 547 547 Investment finance Korea KB Material and Parts No.1 PEF 1 14.47 3,400 3,371 3,371 Investment finance Korea FineKB Private Equity Fund No.1 25.00 — — — Investment finance Korea Others 2,475 1,004 674 ￦ 737,672 ￦ 757,297 ￦ 771,435 1 As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate’s financial and business policies through participation in governing bodies. 2 In order to direct relevant activities, it is necessary to obtain the consent of the two co-operative 3 The ownership of Paycoms Co., Ltd. would be 22.96% and 22.96% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond. 4 The ownership of Food Factory Co., Ltd. would be 30.00% and 30.00% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond. In accordance with IAS No.28 Investments in Associates and Joint Ventures Although the Group holds more than 20% of ownership, the entities that the Group has a limited influence on due to the trust agreement on related activities, bankruptcy and rehabilitation procedures have been excluded from the investment in associates by limited influence 13.2 Condensed financial information, adjustments to the carrying amount and dividend from major investments in associates and joint ventures as of December 31, 2019 and 2020, and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019* Total assets Total Paid-in Equity Share of net Unrealized Consoli- (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 11,237 ￦ 20 ￦ 8,690 ￦ 11,217 ￦ 1,705 ￦ — ￦ 1,705 KB GwS Private Securities Investment Trust 522,865 741 425,814 522,124 138,013 (1,845 ) 136,168 KB-KDBC Pre-IPO 29,086 603 30,000 28,483 18,988 — 18,988 KB Star Office Private Real Estate Investment Trust No.1 218,611 122,465 95,000 96,146 19,839 — 19,839 PT Bank Bukopin TBK 8,148,013 7,623,829 106,536 524,184 115,321 6,060 121,381 Balhae Infrastructure Company 806,218 1,854 834,695 804,364 101,391 — 101,391 Aju Good Technology Venture Fund 60,675 828 52,000 59,847 23,016 — 23,016 SY Auto Capital Co., Ltd. 88,611 52,415 20,000 36,196 17,736 (5,011 ) 12,725 Incheon Bridge Co., Ltd. 609,194 707,563 61,096 (98,369 ) (14,746 ) 14,746 — Big Dipper Co., Ltd. 370 336 1,500 34 10 115 125 APRO Co., Ltd. 47,164 30,281 2,468 16,883 2,565 225 2,790 Paycoms Co., Ltd. 1,763 1,620 855 143 17 28 45 Food Factory Co., Ltd. 5,587 3,797 450 1,790 398 602 1,000 KBSP Private Equity Fund No.4 39,492 2 40,800 39,490 5,904 — 5,904 KB Private Equity Fund No.3 49,437 4 51,000 49,433 7,754 — 7,754 Korea Credit Bureau Co., Ltd. 96,855 30,289 10,000 66,566 5,991 — 5,991 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 55,524 1,063 51,880 54,461 13,616 — 13,616 Keystone-Hyundai Securities No.1 Private Equity Fund 187,156 153,842 42,837 33,314 1,625 — 1,625 KB Social Impact Investment Fund 4,885 3 5,000 4,882 1,465 — 1,465 KB-Solidus 103,896 5 61,800 103,891 45,021 697 45,718 POSCO-KB 21,916 4 24,000 21,912 6,847 — 6,847 GH Real Estate I LP 45,340 61 42,093 45,279 19,042 — 19,042 KB-TS 36,445 1,212 35,400 35,233 19,731 — 19,731 KB-Brain Scale-up 48,369 185 51,700 48,184 20,504 (752 ) 19,752 KB-SJ 14,914 4 16,200 14,910 2,761 — 2,761 UNION Media Commerce Fund 3,318 4 3,450 3,314 961 — 961 KB-Stonebridge 34,450 507 35,805 33,943 4,944 — 4,944 KB SPROTT Renewable Private Equity Fund No.1 3,686 249 9,640 3,437 1,295 — 1,295 KB-UTC 1,016 75 1,016 941 417 — 417 2019* Operating Net profit Other Total Dividends (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 3,225 ￦ 2,452 ￦ — ￦ 2,452 ￦ — KB GwS Private Securities Investment Trust 42,503 41,524 — 41,524 9,297 KB-KDBC Pre-IPO 371 (638 ) — (638 ) — KB Star Office Private Real Estate Investment Trust No.1 14,455 6,004 — 6,004 — PT Bank Bukopin TBK 721,169 (5,612 ) 45,780 40,168 — Balhae Infrastructure Company 62,113 (3,153 ) — (3,153 ) 6,855 Aju Good Technology Venture Fund 9,288 7,734 — 7,734 — SY Auto Capital Co., Ltd. 20,394 5,292 (215 ) 5,077 — Incheon Bridge Co., Ltd. 107,178 9,127 — 9,127 — Big Dipper Co., Ltd. 598 (532 ) — (532 ) — APRO Co., Ltd. 47,725 7,702 — 7,702 — Paycoms Co., Ltd. 262 (343 ) — (343 ) — Food Factory Co., Ltd. 6,807 664 — 664 — KBSP Private Equity Fund No.4 39 (1,304 ) — (1,304 ) — KB Private Equity Fund No.3 — (485 ) — (485 ) — Korea Credit Bureau Co., Ltd. 91,200 1,480 — 1,480 135 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 4,077 (3,911 ) — (3,911 ) — Keystone-Hyundai Securities No.1 Private Equity Fund 18,342 (572 ) — (572 ) — KB Social Impact Investment Fund 8 (118 ) — (118 ) — KB-Solidus 13,085 8,708 — 8,708 — POSCO-KB 1,000 (371 ) — (371 ) — GH Real Estate I LP 5,043 3,698 565 4,263 — KB-TS 1,643 632 — 632 — KB-Brain Scale-up 138 (3,355 ) — (3,355 ) — KB-SJ — (673 ) — (673 ) — UNION Media Commerce Fund — (3 ) — (3 ) — KB-Stonebridge 346 (1,856 ) — (1,856 ) — KB SPROTT Renewable Private Equity Fund No.1 1 (986 ) — (986 ) — KB-UTC — (75 ) — (75 ) — December 31, 2020* Total assets Total Paid-in Equity Share Unrealized Consolidated (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 8,423 ￦ 3 ￦ 5,940 ￦ 8,420 ￦ ￦ — ￦ 1,279 KB GwS Private Securities Investment Trust 534,764 741 425,814 534,023 142,799 (1,440 ) 141,359 KB-KDBC Pre-IPO 24,655 592 20,400 24,063 16,042 — 16,042 KB Star Office Private Real Estate Investment Trust No.1 231,018 122,298 95,000 108,720 20,413 (347 ) 20,066 Balhae Infrastructure Company 847,758 1,870 841,784 845,888 106,624 — 106,624 Aju Good Technology Venture Fund 57,776 2,265 44,500 55,511 21,351 (3 ) 21,348 SY Auto Capital Co., Ltd. 89,462 51,272 20,000 38,190 18,713 (2,569 ) 16,144 Incheon Bridge Co., Ltd. 579,386 700,133 61,096 (120,747 ) (18,100 ) 18,100 — Big Dipper Co., Ltd. 285 306 1,750 (21 ) (5 ) 5 — Paycoms Co., Ltd. 2,690 2,073 855 617 72 126 198 Food Factory Co., Ltd. 7,613 4,767 450 2,846 632 649 1,281 KBSP Private Equity Fund No.4 39,795 — 40,800 39,795 5,950 — 5,950 KB Private Equity Fund No.3 1,132 533 — 599 94 — 94 Korea Credit Bureau Co., Ltd. 117,077 37,599 10,000 79,478 7,153 — 7,153 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 42,585 3,205 38,960 39,380 9,845 — 9,845 Keystone-Hyundai Securities No.1 Private Equity Fund 178,848 132,123 42,837 46,725 1,556 — 1,556 KB Social Impact Investment Fund 9,585 4 10,000 9,581 2,874 — 2,874 KB-Solidus 106,215 1,179 75,600 105,036 45,516 697 46,213 POSCO-KB 41,807 541 33,200 41,266 12,895 — 12,895 KB-TS 34,972 3,490 29,600 31,482 17,630 — 17,630 KB-Brain Scale-up 64,968 313 62,980 64,655 27,513 (750 ) 26,763 KB-SJ 22,327 6 24,300 22,321 4,133 — 4,133 UNION Media Commerce Fund 3,318 7 3,450 3,311 960 — 960 KB-Stonebridge 114,712 496 98,235 114,216 16,636 — 16,636 KB SPROTT Renewable Private Equity Fund No.1 13,896 497 15,376 13,399 5,049 — 5,049 KB-UTC 38,585 207 39,319 38,378 16,999 — 16,999 WJ Private Equity Fund No.1 36,197 170 37,100 36,027 9,711 — 9,711 All Together Korea Fund No.2 10,025 1 10,001 10,024 10,023 — 10,023 KB-NAU 47,607 850 47,500 46,757 5,611 — 5,611 JR GLOBAL REIT 1,859,214 1,043,068 165,600 816,146 215,854 — 215,854 Project Vanilla Co., Ltd. 4,445 132 5,000 4,313 2,151 — 2,151 December & Company Inc. 68,173 3,305 35,441 64,868 24,402 — 24,402 2020 KB Fintech Renaissance Fund 10,841 5 10,900 10,836 547 — 547 KB Material and Parts No.1 PEF 23,296 — 23,500 23,296 3,371 — 3,371 FineKB Private Equity Fund No.1 — 77 — (77 ) — — — 2020* Operating Net profit Other Total Dividends (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 1,942 ￦ 1,053 ￦ — ￦ 1,053 ￦ — KB GwS Private Securities Investment Trust 48,501 47,520 — 47,520 9,525 KB-KDBC Pre-IPO 5,151 4,421 — 4,421 — KB Star Office Private Real Estate Investment Trust No.1 2,392 1,076 — 1,076 — Balhae Infrastructure Company 63,781 89,757 — 89,757 6,973 Aju Good Technology Venture Fund 8,685 2,815 — 2,815 — SY Auto Capital Co., Ltd. 17,404 2,057 (49 ) 2,008 — Incheon Bridge Co., Ltd. 70,345 (23,200 ) — (23,200 ) — Big Dipper Co., Ltd. 942 (305 ) — (305 ) — Paycoms Co., Ltd. 1,391 505 — 505 — Food Factory Co., Ltd. 9,282 407 — 407 — KBSP Private Equity Fund No.4 2 306 — 306 — KB Private Equity Fund No.3 — 15,442 — 15,442 2,082 Korea Credit Bureau Co., Ltd. 107,810 13,391 — 13,391 89 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 1,629 626 — 626 — Keystone-Hyundai Securities No.1 Private Equity Fund 16,586 (1,536 ) — (1,536 ) — KB Social Impact Investment Fund 8 (301 ) — (301 ) — KB-Solidus 6,435 (12,655 ) — (12,655 ) — POSCO-KB 12,842 10,154 — 10,154 — KB-TS 5,342 4,051 — 4,051 — KB-Brain Scale-up 5,257 3,013 — 3,013 — KB-SJ — (689 ) — (689 ) — UNION Media Commerce Fund — (3 ) — (3 ) — KB-Stonebridge 20,068 17,842 — 17,842 — KB SPROTT Renewable Private Equity Fund No.1 1 (991 ) — (991 ) — KB-UTC — (866 ) — (866 ) — WJ Private Equity Fund No.1 2 (1,073 ) — (1,073 ) — All Together Korea Fund No.2 187 150 — 150 — KB-NAU 2,901 (743 ) — (743 ) — JR GLOBAL REIT — — — — — Project Vanilla Co., Ltd. — (611 ) — (611 ) — December & Company Inc. 756 (2,469 ) — (2,469 ) — 2020 KB Fintech Renaissance Fund 1 (64 ) — (64 ) — KB Material and Parts No.1 PEF — (204 ) — (204 ) — FineKB Private Equity Fund No.1 — (77 ) — (77 ) — * The condensed financial information of the associates and joint ventures is adjusted to reflect adjustments made by the Group, such as fair value adjustments made at the time of acquisition and adjustments for differences in accounting policies. 13.3 Changes in carrying amount of investments in associates and joint ventures for the years ended December 31, 2019 and 2020, are as follows: 2019 1 Beginning Acquisition Disposal Dividends Gains Other hensive income Impairment Ending (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 1,649 ￦ — ￦ (317 ) ￦ — ￦ 373 ￦ — ￦ — ￦ 1,705 KB GwS Private Securities Investment Trust 134,362 — — (9,297 ) 11,103 — — 136,168 KB-KDBC Pre-IPO 14,594 5,000 — — (606 ) — — 18,988 KB Star Office Private Real Estate Investment Trust No.1 19,839 — — — — — — 19,839 PT Bank Bukopin 2 113,932 — — — (1,236 ) 10,408 (1,723 ) 121,381 Balhae Infrastructure Company 108,050 592 — (6,855 ) (396 ) — — 101,391 Aju Good Technology Venture Fund 18,134 1,960 — — 2,922 — — 23,016 SY Auto Capital Co., Ltd. 10,672 — — — 2,158 (105 ) — 12,725 Big Dipper Co., Ltd. 280 — — — (155 ) — — 125 APRO Co., Ltd. 1,403 — — — 1,386 1 — 2,790 Paycoms Co., Ltd. 103 — — — (58 ) — — 45 Food Factory Co., Ltd. 928 — — — 72 — — 1,000 KBSP Private Equity Fund No.4 — 6,100 — — (196 ) — — 5,904 KB Private Equity Fund No.3 7,830 — — — (76 ) — — 7,754 Korea Credit Bureau Co., Ltd. 5,941 — — (135 ) 185 — — 5,991 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 14,601 — — — (985 ) — — 13,616 Keystone-Hyundai Securities No.1 Private Equity Fund 1,581 66 — — (26 ) 4 — 1,625 KB Social Impact Investment Fund — 1,500 — — (35 ) — — 1,465 KB-Solidus — 42,697 — — 3,021 — — 45,718 POSCO-KB 4,463 2,500 — — (116 ) — — 6,847 GH Real Estate I LP 17,252 — — — 1,553 237 — 19,042 KB-TS 13,777 7,440 (1,840 ) — 269 85 — 19,731 KB-Brain Scale-up 7,930 13,250 — — (1,428 ) — — 19,752 KB-SJ 1,386 1,500 — — (125 ) — — 2,761 UNION Media Commerce Fund 962 — — — (1 ) — — 961 KB-Stonebridge — 7,070 (1,855 ) — (271 ) — — 4,944 KB SPROTT Renewable Private Equity Fund No.1 — 1,667 — — (372 ) — — 1,295 KB-UTC — 450 — — (33 ) — — 417 Others 5,263 408 (4,463 ) — 667 212 (843 ) 1,244 ￦ 504,932 ￦ 92,200 ￦ (8,475 ) ￦ (16,287 ) ￦ 17,594 ￦ 10,842 ￦ (2,566 ) ￦ 598,240 2020 1 Beginning Acquisition Disposal Dividends Gains Other hensive income Ending (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 1,705 ￦ — ￦ (586 ) ￦ — ￦ 160 ￦ — ￦ 1,279 KB GwS Private Securities Investment Trust 136,168 — — (9,525 ) 14,716 — 141,359 KB-KDBC Pre-IPO 18,988 — (6,399 ) — 3,453 — 16,042 KB Star Office Private Real Estate Investment Trust No.1 19,839 — — — 227 — 20,066 PT Bank Bukopin TBK 2 121,381 43,909 (54,069 ) — (107,258 ) (3,963 ) — Balhae Infrastructure Company 101,391 893 — (6,973 ) 11,313 — 106,624 Aju Good Technology Venture Fund 23,016 — (2,885 ) — 1,217 — 21,348 SY Auto Capital Co., Ltd. 12,725 — — — 3,422 (3 ) 16,144 Incheon Bridge Co., Ltd. — — — — — — — Big Dipper Co., Ltd. 125 — — — (125 ) — — Paycoms Co., Ltd. 45 — — — 153 — 198 Food Factory Co., Ltd. 1,000 — — — 247 34 1,281 KBSP Private Equity Fund No.4 5,904 — — — 46 — 5,950 KB Private Equity Fund No.3 7,754 — (8,000 ) (2,082 ) 2,422 — 94 Korea Credit Bureau Co., Ltd. 5,991 — — (89 ) 1,251 — 7,153 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 13,616 — (3,231 ) — (540 ) — 9,845 Keystone-Hyundai Securities No.1 Private Equity Fund 1,625 — — — (69 ) — 1,556 KB Social Impact Investment Fund 1,465 1,500 — — (91 ) — 2,874 KB-Solidus 45,718 10,920 (4,940 ) — (5,485 ) — 46,213 POSCO-KB 6,847 5,000 (2,125 ) — 3,173 — 12,895 KB-TS 19,731 2,240 (5,488 ) — 1,232 (85 ) 17,630 KB-Brain Scale-up 19,752 8,000 (3,200 ) — 2,211 — 26,763 KB-SJ 2,761 1,500 — — (128 ) — 4,133 UNION Media Commerce Fund 961 — — — (1 ) — 960 KB-Stonebridge 4,944 9,093 — — 2,599 — 16,636 KB SPROTT Renewable Private Equity Fund No.1 1,295 4,128 — — (374 ) — 5,049 KB-UTC 417 16,966 — — (384 ) — 16,999 WJ Private Equity Fund No.1 — 10,000 — — (289 ) — 9,711 All Together Korea Fund No.2 — 100,000 (90,000 ) — 150 (127 ) 10,023 KB-NAU — 5,700 — — (89 ) — 5,611 JR GLOBAL REIT — 219,493 (3,639 ) — — — 215,854 Project Vanilla Co., Ltd. — 2,450 — — (299 ) — 2,151 December & Company Inc. — 30,000 (5,151 ) — (447 ) — 24,402 2020 KB Fintech Renaissance Fund — 550 — — (3 ) — 547 KB Material and Parts No.1 PEF — 3,400 — — (29 ) — 3,371 FineKB Private Equity Fund No.1 — — — — — — — Others 23,076 40,000 (61,862 ) — (899 ) 359 674 ￦ 598,240 ￦ 515,742 ￦ (251,575 ) ￦ (18,669 ) ￦ (68,518 ) ￦ (3,785 ) ￦ 771,435 1 Gains on disposal of investments in associates and joint ventures amount to ￦ 1,423 million ￦ 24,768 million for the years ended December 31, 2019 and 2020, respectively. 2 The investment was reclassified to subsidiaries from associates for the year ended December 31, 2020 due to additional share purchase. 13.4 Unrecognized share of losses in investments in associates and joint ventures due to discontinuation of applying the equity method for the years ended December 31, 2019 and 2020 and accumulated amount as of December 31, 2019 and 2020, are as follows: Unrecognized losses (gains) Accumulated unrecognized losses 2019 2020 December 31, 2019 December 31, 2020 (In millions of Korean won) Doosung Metal Co., Ltd. ￦ 46 ￦ — ￦ 65 ￦ 65 Incheon Bridge Co., Ltd. (1,944 ) 3,354 14,746 18,100 Jungdong Steel Co., Ltd. — — 489 489 DPAPS Co., Ltd. 14 19 339 358 Shinla Construction Co., Ltd. — — 183 183 Jaeyang Industry Co., Ltd. — — 30 30 Terra Corporation — — 14 14 Jungdo Co., Ltd. — 151 161 312 Jinseung Tech Co., Ltd. 18 — 21 21 Korea NM Tech Co., Ltd. — — 28 28 Chongil Machine & Tools Co., Ltd. 19 — 19 19 SKYDIGITAL INC. 106 — 106 106 Imt Technology Co., Ltd. — 3 — 3 Jo Yang Industrial Co., Ltd. — 96 — 96 IDTECK Co., Ltd. — 216 — 216 ￦ (1,741 ) ￦ 3,839 ￦ 16,201 ￦ 20,040

Property and Equipment, and Inv

Property and Equipment, and Investment Properties	12 Months Ended
	Dec. 31, 2020
Disclosure Of Property Plant And Equipment And Investment Property Abstract [Abstract]
Disclosure Of Property Plant And Equipment And Investment Property Explanatory	14. Property and Equipment, and Investment Properties 14.1 Property and Equipment 14.1.1 Details of property and equipment as of December 31, 2019 and 2020, are as follows: December 31, 2019 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Land ￦ 2,431,812 ￦ — ￦ (1,018 ) ￦ 2,430,794 Buildings 2,265,929 (757,147 ) (5,859 ) 1,502,923 Leasehold improvements 865,531 (749,407 ) — 116,124 Equipment and vehicles 1,867,739 (1,487,386 ) — 380,353 Construction in-progress 86,303 — — 86,303 Right-of-use 854,327 (302,269 ) (1,178 ) 550,880 ￦ 8,371,641 ￦ (3,296,209 ) ￦ (8,055 ) ￦ 5,067,377 December 31, 2020 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Land ￦ 2,611,604 ￦ — ￦ (1,018 ) ￦ 2,610,586 Buildings 2,607,957 (830,516 ) (5,859 ) 1,771,582 Leasehold improvements 929,120 (833,293 ) — 95,827 Equipment and vehicles 2,040,100 (1,699,442 ) — 340,658 Construction in-progress 44,190 — — 44,190 Right-of-use 1,094,876 (524,165 ) — 570,711 ￦ 9,327,847 ￦ (3,887,416 ) ￦ (6,877 ) ￦ 5,433,554 14.1.2 Changes in property and equipment for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Acquisition Transfer 1 Disposal Depreciation 2 Business Combination Others Ending (In millions of Korean won) Land ￦ 2,432,041 ￦ 7,334 ￦ (3,957 ) ￦ (4,907 ) ￦ — ￦ — ￦ 283 ￦ 2,430,794 Buildings 1,330,211 10,908 220,535 (9,964 ) (55,669 ) — 6,902 1,502,923 Leasehold improvements 122,309 13,398 58,645 (338 ) (77,948 ) — 58 116,124 Equipment and vehicles 280,624 283,896 (4 ) (526 ) (183,900 ) — 263 380,353 Construction in-progress 88,618 293,204 (288,136 ) — — — (7,383 ) 86,303 Right-of-use 589,188 379,934 19 (153,034 ) (281,404 ) — 16,177 550,880 ￦ 4,842,991 ￦ 988,674 ￦ (12,898 ) ￦ (168,769 ) ￦ (598,921 ) ￦ — ￦ 16,300 ￦ 5,067,377 2020 Beginning Acquisition Transfer 1 Disposal Depreciation2 Business Combination Others Ending (In millions of Korean won) Land ￦ 2,430,794 ￦ 6,475 ￦ (116,264 ) ￦ (2,578 ) ￦ — ￦ 295,421 ￦ (3,262 ) ￦ 2,610,586 Buildings 1,502,923 43,592 190,917 (4,442 ) (61,339 ) 100,984 (1,053 ) 1,771,582 Leasehold improvements 116,124 13,348 34,596 (574 ) (73,394 ) 5,087 640 95,827 Equipment and vehicles 380,353 161,515 3,705 (1,990 ) (221,697 ) 19,873 (1,101 ) 340,658 Construction in-progress 86,303 229,927 (291,336 ) — — 20,022 (726 ) 44,190 Right-of-use 550,880 426,405 53 (203,376 ) (272,686 ) 55,656 13,779 570,711 ￦ 5,067,377 ￦ 881,262 ￦ (178,329 ) ￦ (212,960 ) ￦ (629,116 ) ￦ 497,043 ￦ 8,277 ￦ 5,433,554 1 Includes transfers with investment properties and assets held for sale. 2 Includes depreciation expenses amounting to ￦ 111 million and ￦ 123 million recorded as other operating expenses for the years ended December 31, 2019 and 2020, respectively. 14.1.3 Changes in accumulated impairment losses of property and equipment for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Impairment Reversal Disposal and Ending (In millions of Korean won) Accumulated impairment losses of property and equipment ￦ (6,877 ) ￦ — ￦ — ￦ — ￦ (6,877 ) Accumulated impairment losses of right-of-use — (1,178 ) — — (1,178 ) ￦ (6,877 ) ￦ (1,178 ) ￦ — ￦ — ￦ (8,055 ) 2020 Beginning Impairment Reversal Disposal and Ending (In millions of Korean won) Accumulated impairment losses of property and equipment ￦ (6,877 ) ￦ (12 ) ￦ — ￦ 12 ￦ (6,877 ) Accumulated impairment losses of right-of-use (1,178 ) — — 1,178 — ￦ (8,055 ) ￦ (12 ) ￦ — ￦ 1,190 ￦ (6,877 ) 14.2 Investment Properties 14.2.1 Details of investment properties as of December 31, 2019 and 2020, are as follows: December 31, 2019 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Land ￦ 1,537,240 ￦ — ￦ — ￦ 1,537,240 Buildings 1,463,736 (172,988 ) — 1,290,748 ￦ 3,000,976 ￦ (172,988 ) ￦ — ￦ 2,827,988 December 31, 2020 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Land ￦ 1,568,508 ￦ — ￦ (410 ) ￦ 1,568,098 Buildings 1,092,737 (122,833 ) (4,463 ) 965,441 ￦ 2,661,245 ￦ (122,833 ) ￦ (4,873 ) ￦ 2,533,539 14.2.2 Valuation techniques and inputs that are used to measure the fair value of investment properties as of December 31, 2020, are as follows: December 31, 2020 Fair value Valuation techniques Inputs (In millions of Land and buildings ￦ 92,128 Cost approach method -  Price per square meter -  Replacement cost 1,141,121 Market comparison method -  Price per square meter 1,248,604 Cash flow approach -  Prospective rental market growth rate -  Period of vacancy -  Rental rate -  Discount rate and others 230,800 Income approach -  Discount rate -  Capitalization rate -  Vacancy rate Fair value of the investment properties amounts to ￦ 3,032,726 million and ￦ 2,712,653 million as of December 31, 2019 and 2020, respectively. The investment properties were measured by qualified independent appraisers with experience in valuing similar properties in the same area. In addition, per fair value hierarchy in Note 6.1.2, fair value hierarchy of all investment properties has been classified as Level 3. Rental income from the above investment properties for the years ended December 31, 2019 and 2020, amounts to ￦ 129,944 million and ￦ 157,652 million, respectively. 14.2.3 Changes in investment properties for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Acquisition Transfer Disposal Depreciation Others Ending (In millions of Korean won) Land ￦ 972,562 ￦ 580,255 ￦ (3,374 ) ￦ (13,318 ) ￦ — ￦ 1,115 ￦ 1,537,240 Buildings 1,147,249 225,833 (8,861 ) (50,780 ) (36,877 ) 14,184 1,290,748 ￦ 2,119,811 ￦ 806,088 ￦ (12,235 ) ￦ (64,098 ) ￦ (36,877 ) ￦ 15,299 ￦ 2,827,988 2020 Beginning Acquisition Transfer Disposal Depreciation Business combination Others Ending (In millions of Korean won) Land ￦ 1,537,240 ￦ 34,529 ￦ 61,383 ￦ (167,015 ) ￦ — ￦ 106,944 ￦ (4,983 ) ￦ 1,568,098 Buildings 1,290,748 18,667 37,694 (378,332 ) (38,717 ) 42,169 (6,788 ) 965,441 ￦ 2,827,988 ￦ 53,196 ￦ 99,077 ￦ (545,347 ) ￦ (38,717 ) ￦ 149,113 ￦ (11,771 ) ￦ 2,533,539

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2020
Disclosure Of Intangible Assets Abstract [Abstract]
Disclosure Of Intangible Assets Explanatory	15. Intangible Assets 15.1 Details of intangible assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 Acquisition Accumulated Accumulated Others Carrying amount (In millions of Korean won) Goodwill ￦ 346,314 ￦ — ￦ (70,517 ) ￦ (56 ) ￦ 275,741 Other intangible assets 4,420,371 (1,926,647 ) (31,652 ) — 2,462,072 ￦ 4,766,685 ￦ (1,926,647 ) ￦ (102,169 ) ￦ (56 ) ￦ 2,737,813 December 31, 2020 Acquisition Accumulated Accumulated Others Carrying amount (In millions of Korean won) Goodwill ￦ 887,259 ￦ — ￦ (70,517 ) ￦ (53,160 ) ￦ 763,582 Other intangible assets 4,928,003 (2,304,188 ) (36,264 ) — 2,587,551 ￦ 5,815,262 ￦ (2,304,188 ) ￦ (106,781 ) ￦ (53,160 ) ￦ 3,351,133 15.2 Details of goodwill as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 Acquisition Carrying Acquisition Carrying (In millions of Korean won) Housing & Commercial Bank ￦ 65,288 ￦ 65,288 ￦ 65,288 ￦ 65,288 KB Cambodia Bank 1,202 — 1,202 — KB Securities Co., Ltd. 70,265 58,889 70,265 58,889 KB Capital Co., Ltd. 79,609 79,609 79,609 79,609 KB Savings Bank Co., Ltd. 115,343 57,404 115,343 57,404 KB Securities Vietnam Joint Stock Company 13,092 12,987 13,092 12,234 KB Daehan Specialized Bank Plc. 1,515 1,564 1,515 1,470 PRASAC Microfinance Institution Plc. — — 396,942 356,570 PT Sunindo Kookmin Best Finance — — 2,963 2,963 PT Bank Bukopin TBK — — 89,220 80,002 PT. KB Finansia Multi Finance — — 51,820 49,153 ￦ 346,314 ￦ 275,741 ￦ 887,259 ￦ 763,582 * Includes the effect of exchange differences etc. 15.3 Changes in accumulated impairment losses of goodwill for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Impairment Others Ending (In millions of Korean won) Accumulated impairment losses of goodwill ￦ (70,517 ) ￦ — ￦ — ￦ (70,517 ) 2020 Beginning Impairment Others Ending (In millions of Korean won) Accumulated impairment losses of goodwill ￦ (70,517 ) ￦ — ￦ — ￦ (70,517 ) 15.4 Details of goodwill allocation to cash-generating units and related information for impairment testing as of December 31, 2020 are as follows: December 31, 2020 Carrying Recoverable amount Discount rate Permanent (In millions of Korean won) Housing & Commercial Bank Retail banking ￦ 49,315 ￦ 1,595,304 17.46 1.00 Corporate banking 15,973 955,540 17.63 1.00 KB Securities Co., Ltd. 58,889 11,340 21.46 1.00 KB Capital Co., Ltd. 79,609 424,933 17.39 1.00 KB Savings Bank Co., Ltd. and Yehansoul Savings Bank Co., Ltd. 57,404 443,778 13.80 1.00 KB Securities Vietnam Joint Stock Company 12,234 10,262 23.61 1.00 KB Daehan Specialized Bank Plc. 1,470 9,299 25.77 1.00 PRASAC Microfinance Institution Plc. 356,570 111,425 24.50 3.00 PT Sunindo Kookmin Best Finance 2,963 1,909 15.47 0.00 PT. KB Finansia Multi Finance 49,153 28,990 16.19 3.00 ￦ 683,580 ￦ 3,592,780 For impairment testing, goodwill is allocated to cash-generating units that are expected to benefit from the synergies of the business combination, and cash-generating units consist of an operating segment or units which are not larger than an operating segment. The Group recognized goodwill amounting to ￦ 65,288 million from the merger of Housing & Commercial Bank, the amounts of ￦ 49,315 million and ￦ 15,973 million were allocated to the retail banking and corporate banking, respectively. And the goodwill of ￦ 356,570 million arising from the acquisition of PRASAC Microfinance Institution Plc. was allocated to microfinance unit. Cash-generating units to which goodwill has been allocated is tested for impairment annually and whenever there is an indication that the unit may be impaired, by comparing the carrying amount of the unit, including the goodwill, with the recoverable amount of the unit. The recoverable amount of a cash-generating unit is measured at the higher of its fair value less costs to sell and its value in use. The fair value less costs to sell is the amount obtainable from the sale in an arm’s length transaction between knowledgeable, willing parties, less the costs of disposal. If it is difficult to measure the amount obtainable from the sale of the cash-generating unit, the Group measures the fair value less costs to sell by reflecting the characteristics of the measured cash-generating unit. If it is not possible to obtain reliable information to measure the fair value less costs to sell, the Group uses the asset’s value in use as its recoverable amount. Value in use is the present value of the future cash flows expected to be derived from an asset or cash-generating unit. The projections of the future cash flows are based on the most recent financial budget approved by management and generally cover a period of five years. The future cash flows of retail banking and corporate banking after projection period are estimated on the assumption that the future cash flows will increase by 1.0% per year. The key assumptions used for the estimation of the future cash flows are estimated based on the market size and the Group’s market share. The future cash flows PRASAC Microfinance Institution Plc. after five years are estimated on the assumption that the future cash flows will increase by 3.0% per year. The key assumptions used for the estimation of the future cash flows are the GDP growth rate of Cambodia, the market size and the recent growth rate of PRASAC Microfinance Institution Plc. The discount rate is a pre-tax The Group acquired a 67% stake in PT Bank Bukopin TBK with the acquisition date of September 2, 2020, and the goodwill recognized due to the business combination is ￦ 80,002 million as of December 31, 2020. The Group conducts an impairment test annually and whenever there is an indication of impairment, and no indication of impairment has been observed as of December 31, 2020. 15.5 Details of intangible assets other than goodwill as of December 31, 2019 and 2020, are as follows: December 31, 2019 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Industrial property rights ￦ 5,802 ￦ (2,930 ) ￦ (19 ) ￦ 2,853 Software 1,428,655 (1,055,136 ) — 373,519 Other intangible assets 555,424 (257,274 ) (31,633 ) 266,517 Value of Business Acquired (VOBA) 2,395,290 (585,805 ) — 1,809,485 Right-of-use 35,200 (25,502 ) — 9,698 ￦ 4,420,371 ￦ (1,926,647 ) ￦ (31,652 ) ￦ 2,462,072 December 31, 2020 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Industrial property rights ￦ 6,222 ￦ (2,936 ) ￦ (940 ) ￦ 2,346 Software 1,800,686 (1,225,173 ) (2,326 ) 573,187 Other intangible assets 690,665 (285,893 ) (32,998 ) 371,774 Value of Business Acquired (VOBA) 2,395,291 (759,672 ) — 1,635,619 Right-of-use 35,139 (30,514 ) — 4,625 ￦ 4,928,003 ￦ (2,304,188 ) ￦ (36,264 ) ￦ 2,587,551 15.6 Changes in intangible assets other than goodwill for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Acquisition & Disposal Amortization 1 Others Ending (In millions of Korean won) Industrial property rights ￦ 4,497 ￦ 174 ￦ (1,160 ) ￦ (658 ) ￦ — ￦ 2,853 Software 204,505 274,583 — (105,228 ) (341 ) 373,519 Other intangible assets 2 248,611 59,776 (13,534 ) (33,590 ) 5,254 266,517 Value of Business Acquired (VOBA) 2,001,945 — — (192,460 ) — 1,809,485 Right-of-use 21,063 1,010 — (9,893 ) (2,482 ) 9,698 ￦ 2,480,621 ￦ 335,543 ￦ (14,694 ) ￦ (341,829 ) ￦ 2,431 ￦ 2,462,072 2020 Beginning Acquisition & Disposal Amortization 1 Business combination Others Ending (In millions of Korean won) Industrial property rights ￦ 2,853 ￦ 116 ￦ (147 ) ￦ (476 ) ￦ — ￦ — ￦ 2,346 Software 373,519 340,045 (4,444 ) (153,876 ) 18,252 (309 ) 573,187 Other intangible assets 2 266,517 63,743 (9,527 ) (47,948 ) 106,445 (7,456 ) 371,774 Value of Business Acquired (VOBA) 1,809,485 — — (173,866 ) — — 1,635,619 Right-of-use 9,698 — — (5,026 ) — (47 ) 4,625 ￦ 2,462,072 ￦ 403,904 ￦ (14,118 ) ￦ (381,192 ) ￦ 124,697 ￦ (7,812 ) ￦ 2,587,551 1 Includes ￦ 193,085 million and ￦ 173,992 million recorded as insurance expenses and other operating expenses for the years ended December 31, 2019 and 2020, respectively. 2 Impairment losses for membership right of other intangible asset with indefinite useful life was recognized when its recoverable amount is lower than its carrying amount, and reversal of impairment losses was recognized when its recoverable amount is higher than its carrying amount. 15.7 Changes in accumulated impairment losses of other intangible assets for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Impairment Reversal Disposal and Ending (In millions of Korean won) Accumulated impairment losses of other intangible assets ￦ (45,017 ) ￦ (1,578 ) ￦ 6,859 ￦ 8,084 ￦ (31,652 ) 2020 Beginning Impairment Reversal Disposal and Ending (In millions of Korean won) Accumulated impairment losses of other intangible assets ￦ (31,652 ) ￦ (9,312 ) ￦ 3,669 ￦ 1,031 ￦ (36,264 )

Lease

Lease	12 Months Ended
	Dec. 31, 2020
Presentation of leases for lessee [Abstract]
Disclosure Of Leases Explanatory	16. Lease 16.1 The Group as a Lessee 16.1.1 Amounts recognized in the consolidated statements of financial position related to lease as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Right-of-use Real estate ￦ 518,795 ￦ 537,392 Vehicles 13,542 16,218 Others 18,543 17,101 550,880 570,711 Right-of-use 9,698 4,626 ￦ 560,578 ￦ 575,337 Lease liabilities* ￦ 544,439 ￦ 559,113 * Included in property and equipment, intangible assets and other liabilities. 16.1.2 Amounts recognized in the consolidated statements of comprehensive income related to lease for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 (In millions of Korean won) Depreciation and amortization of right-of-use Real estate ￦ 251,465 ￦ 246,058 Vehicles 19,594 15,286 Others 10,345 11,342 Intangible assets 9,893 5,026 ￦ 291,297 ￦ 277,712 Interest expenses on the lease liabilities ￦ 12,720 ￦ 13,492 Expense relating to short-term lease 2,209 6,169 Expense relating to leases of low-value 5,416 7,130 Expense relating to variable lease payments not included in lease liabilities (included in administrative expenses) 15 438 Total cash outflow for lease for the years ended December 31, 2019 and 2020 was ￦ 228,312 million and ￦ 245,151 million, respectively. 16.2 The Group as a Lessor 16.2.1 The Group as a finance lessor 16.2.1.1 Total lease investment and the present value of minimum lease payments as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 Total lease investment Present value Total lease investment Present (In millions of Korean won) Up to 1 year ￦ 654,104 ￦ 367,937 ￦ 579,968 ￦ 354,588 1-5 1,085,208 569,939 958,125 551,777 Over 5 years 773 748 — — ￦ 1,740,085 ￦ 938,624 ￦ 1,538,093 ￦ 906,365 16.2.1.2 Unearned interest income on finance lease as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Total lease investment ￦ 1,740,085 ￦ 1,538,093 Net lease investment Present value of minimum lease payments 938,624 906,365 Present value of non-guaranteed 639,075 496,969 1,577,699 1,403,334 Unearned interest income ￦ 162,386 ￦ 134,759 16.2.2 The Group as an operating lessor Future minimum lease receipts arising from the non-cancellable December 31, 2019 December 31, 2020 (In millions of Korean won) Minimum lease receipts Up to 1 year ￦ 577,490 ￦ 792,935 1-5 1,432,354 1,727,498 Over 5 years 682,165 84,733 ￦ 2,692,009 ￦ 2,605,166 16.3 The Group as an operating lessee for the year ended December 31, 2018 The lease payment reflected in profit or loss for the year ended December 31, 2018, is as follows: 2018 (In millions Minimum lease payment ￦ 221,305 Sublease payment (1,804 ) Total ￦ 219,501

Deferred Income Tax Assets and

Deferred Income Tax Assets and Liabilities	12 Months Ended
	Dec. 31, 2020
Net Deferred Tax Assets And Liabilities Abstract [Abstract]
Disclosure Of Deferred Taxes Explanatory	17. Deferred Income Tax Assets and Liabilities 17.1 Details of deferred income tax assets and liabilities as of December 31, 2019 and 2020, are as follows: December 31, 2019 Assets Liabilities Net amount (In millions of Korean won) Other provisions ￦ 115,500 ￦ — ￦ 115,500 Allowances for credit losses 451 (3,266 ) (2,815 ) Impairment losses of property and equipment 4,396 (1,952 ) 2,444 Share-based payments 18,002 — 18,002 Provisions for acceptances and guarantees 20,959 — 20,959 Gains or losses on valuation of derivatives 51,160 (158,604 ) (107,444 ) Present value discount 8,244 (4,201 ) 4,043 Gains or losses on fair value hedge 12,123 — 12,123 Accrued interest — (110,359 ) (110,359 ) Deferred loan origination fees and costs 531 (199,000 ) (198,469 ) Advanced depreciation provision — (1,703 ) (1,703 ) Gains or losses on revaluation 549 (329,331 ) (328,782 ) Investments in subsidiaries and others 35,306 (105,470 ) (70,164 ) Gains or losses on valuation of security investment 39,949 (265,934 ) (225,985 ) Defined benefit liabilities 557,423 — 557,423 Accrued expenses 249,999 — 249,999 Retirement insurance expense — (489,602 ) (489,602 ) Adjustments to the prepaid contributions — (22,897 ) (22,897 ) Derivative-linked securities 131,259 (34,635 ) 96,624 Others 469,540 (762,633 ) (293,093 ) 1,715,391 (2,489,587 ) (774,196 ) Offsetting of deferred income tax assets and liabilities (1,711,794 ) 1,711,794 — ￦ 3,597 ￦ (777,793 ) ￦ (774,196 ) December 31, 2020 Assets Liabilities Net amount (In millions of Korean won) Other provisions ￦ 149,259 ￦ — ￦ 149,259 Allowances for credit losses 26,496 (3,356 ) 23,140 Impairment losses of property and equipment 3,992 (1,889 ) 2,103 Share-based payments 17,718 — 17,718 Provisions for acceptances and guarantees 17,046 — 17,046 Gains or losses on valuation of derivatives 20,645 (223,482 ) (202,837 ) Present value discount 17,058 (3,041 ) 14,017 Gains or losses on fair value hedge 21,060 — 21,060 Accrued interest — (125,835 ) (125,835 ) Deferred loan origination fees and costs 7,224 (226,821 ) (219,597 ) Advanced depreciation provision — (1,703 ) (1,703 ) Gains or losses on revaluation 338 (319,698 ) (319,360 ) Investments in subsidiaries and others 38,164 (111,589 ) (73,425 ) Gains or losses on valuation of security investment 73,857 (1,232,689 ) (1,158,832 ) Defined benefit liabilities 606,146 — 606,146 Accrued expenses 334,900 — 334,900 Retirement insurance expense — (541,317 ) (541,317 ) Adjustments to the prepaid contributions — (28,261 ) (28,261 ) Derivative-linked securities 78,202 (30,881 ) 47,321 Others* 1,081,691 (740,462 ) 341,229 2,493,796 (3,591,024 ) (1,097,228 ) Offsetting of deferred income tax assets and liabilities (2,428,738 ) 2,428,738 — ￦ 65,058 ￦ (1,162,286 ) ￦ (1,097,228 ) * Includes PPA amount from acquisition of Prudential Life Insurance Company of Korea Ltd. and KB Insurance Co., Ltd., and others. 17.2 Unrecognized Deferred Income Tax Assets 17.2.1 No deferred income tax assets have been recognized for the deductible temporary difference of ￦ 242,875 million associated with investments in subsidiaries and associates as of December 31, 2020, because it is not probable that the temporary differences will be reversed in the foreseeable future. 17.2.2 No deferred income tax assets have been recognized for deductible temporary differences of ￦ 75,831 million associated with others, as of December 31, 2020, due to the uncertainty that these will be realized in the future. 17.3 Unrecognized Deferred Income Tax Liabilities 17.3.1 No deferred income tax liabilities have been recognized for the taxable temporary difference of ￦ 260,739 million associated with investment in subsidiaries and associates as of December 31, 2020, due to the following reasons: • The Group is able to control the timing of the reversal of the temporary difference. • It is probable that the temporary difference will not be reversed in the foreseeable future. 17.3.2 No deferred income tax liabilities have been recognized as of December 31, 2020, for the taxable temporary difference of ￦ 65,288 million arising from the initial recognition of goodwill from the merger of Housing and Commercial Bank in 2001. 17.4 Changes in cumulative temporary differences for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Decrease Increase Ending (In millions of Korean won) Deductible temporary differences Gains or losses on fair value hedge ￦ — ￦ — ￦ 44,085 ￦ 44,085 Other provisions 411,903 411,747 424,227 424,383 Allowances for credit losses 12,481 16,160 5,697 2,018 Impairment losses on property and equipment 21,927 21,402 15,460 15,985 Deferred loan origination fees and costs 1,841 1,841 1,930 1,930 Share-based payments 60,071 52,475 55,496 63,092 Provisions for acceptance and guarantees 73,809 73,809 76,214 76,214 Gains or losses on valuation of derivatives 503,277 503,277 186,035 186,035 Present value discount 24,593 24,347 29,732 29,978 Investments in subsidiaries and others 184,870 47,217 47,727 185,380 Gains or losses on valuation of security investment 269,731 264,318 130,823 136,236 Defined benefit liabilities 1,977,430 200,827 384,616 2,161,219 Accrued expenses 993,906 994,326 912,019 911,599 Derivative-linked securities 13,679 13,679 477,307 477,307 Others 1,290,065 600,750 979,710 1,669,025 5,839,583 3,226,175 3,771,078 6,384,486 Unrecognized deferred income tax assets: Other provisions 3,416 4,788 Investments in subsidiaries and others 73,764 67,645 Others 120,704 125,158 5,641,699 6,186,895 Tax rate (%) 27.5 27.5 Total deferred income tax assets ￦ 1,562,537 ￦ 1,715,391 Taxable temporary differences Gains or losses on fair value hedge ￦ (94,085 ) ￦ (94,085 ) ￦ — ￦ — Accrued interest (411,487 ) (362,627 ) (352,477 ) (401,337 ) Allowances for credit losses (238 ) (238 ) (11,877 ) (11,877 ) Impairment losses on property and equipment (4,457 ) (212 ) 82 (4,163 ) Deferred loan origination fees and costs (727,528 ) (727,528 ) (752,178 ) (752,178 ) Advanced depreciation provision (6,192 ) — — (6,192 ) Gains or losses on valuation of derivatives (49,036 ) (49,036 ) (576,743 ) (576,743 ) Present value discount (8,656 ) (8,656 ) (15,278 ) (15,278 ) Goodwill from merger (65,288 ) — — (65,288 ) Gains or losses on revaluation (1,201,992 ) (52,470 ) (48,044 ) (1,197,566 ) Investments in subsidiaries and others (316,346 ) (19,421 ) (122,130 ) (419,055 ) Gains or losses on valuation of security investment (601,496 ) (594,206 ) (899,500 ) (906,790 ) Retirement insurance expense (1,611,475 ) (153,528 ) (317,793 ) (1,775,740 ) Adjustments to the prepaid contributions (69,212 ) (69,212 ) (83,262 ) (83,262 ) Derivative-linked securities (271,873 ) (271,873 ) (125,947 ) (125,947 ) Others (2,098,159 ) (2,917,318 ) (3,613,007 ) (2,793,848 ) (7,537,520 ) (5,320,410 ) (6,918,154 ) (9,135,264 ) Unrecognized deferred income tax liabilities: — Goodwill from merger (65,288 ) (65,288 ) Investments in subsidiaries and others (62,367 ) (68,836 ) Others (588 ) (1,247 ) (7,409,277 ) (8,999,893 ) Tax rate (%) 27.5 27.5 Total deferred income tax liabilities ￦ (2,050,913 ) ￦ (2,489,587 ) 2020 Beginning Business combination Decrease Increase Ending (In millions of Korean won) Deductible temporary differences Gains or losses on fair value hedge ￦ 44,085 ￦ — ￦ 44,085 ￦ 76,583 ￦ 76,583 Other provisions 424,383 6,383 426,457 540,396 544,705 Allowances for credit losses 2,018 105,505 96,885 83,111 93,749 Impairment losses of property and equipment 15,985 — 9,658 8,189 14,516 Deferred loan origination fees and costs 1,930 35,863 15,098 3,574 26,269 Share-based payments 63,092 5 55,601 54,589 62,085 Provisions for acceptance and guarantees 76,214 — 76,214 61,984 61,984 Gains or losses on valuation of derivatives 186,035 5,201 191,236 76,238 76,238 Present value discount 29,978 — 29,732 61,783 62,029 Investments in subsidiaries and others 185,380 — 47,034 232,655 371,001 Gains or losses on valuation of security investment 136,236 — 136,070 251,524 251,690 Defined benefit liabilities 2,161,219 94,105 227,010 327,255 2,355,569 Accrued expenses 911,599 75,498 911,599 1,144,785 1,220,283 Derivative-linked securities 477,307 — 477,307 284,370 284,370 Others* 1,669,025 2,068,207 1,170,462 1,081,994 3,648,764 6,384,486 2,390,767 3,914,448 4,289,030 9,149,835 Unrecognized deferred income tax assets: Other provisions 4,788 3,054 Investments in subsidiaries and others 67,645 242,875 Others 125,158 75,831 6,186,895 8,828,075 Tax rate (%) 27.5 27.5 Total deferred income tax assets ￦ 1,715,391 ￦ 2,493,796 Taxable temporary differences Accrued interest ￦ (401,337 ) ￦ (168,859 ) ￦ (394,255 ) ￦ (281,685 ) ￦ (457,626 ) Allowances for credit losses (11,877 ) — (11,877 ) (12,203 ) (12,203 ) Impairment losses of property and equipment (4,163 ) — (111 ) 117 (3,935 ) Deferred loan origination fees and costs (752,178 ) — (752,178 ) (820,223 ) (820,223 ) Advanced depreciation provision (6,192 ) — — — (6,192 ) Gains or losses on valuation of derivatives (576,743 ) — (576,743 ) (812,662 ) (812,662 ) Present value discount (15,278 ) — (15,278 ) (10,916 ) (10,916 ) Goodwill from merger (65,288 ) — — — (65,288 ) Gains or losses on revaluation (1,197,566 ) — (80,036 ) (45,008 ) (1,162,538 ) Investments in subsidiaries and others (419,055 ) — (70,188 ) (297,809 ) (646,676 ) Gains or losses on valuation of security investment (906,790 ) (3,060,750 ) (899,660 ) (1,358,042 ) (4,425,922 ) Retirement insurance expense (1,775,740 ) (61,789 ) (162,764 ) (288,296 ) (1,963,061 ) Adjustments to the prepaid contributions (83,262 ) — (83,262 ) (102,768 ) (102,768 ) Derivative-linked securities (125,947 ) — (125,947 ) (112,293 ) (112,293 ) Others* (2,793,848 ) (1,613 ) (1,644,815 ) (1,555,740 ) (2,706,386 ) (9,135,264 ) (3,293,011 ) (4,817,114 ) (5,697,528 ) (13,308,689 ) Unrecognized deferred income tax liabilities: — Goodwill from merger (65,288 ) (65,288 ) Investments in subsidiaries and others (68,836 ) (260,739 ) Others (1,247 ) (1,042 ) (8,999,893 ) (12,981,620 ) Tax rate (%) 27.5 27.5 Total deferred income tax liabilities ￦ (2,489,587 ) ￦ (3,591,024 ) * Includes PPA amount from acquisition of Prudential Life Insurance Company of Korea Ltd. and KB Insurance Co., Ltd., and others.

Assets Held for Sale

Assets Held for Sale	12 Months Ended
	Dec. 31, 2020
Noncurrent Assets Or Disposal Groups Classified As Held For Sale Or As Held For Distribution To Owners Abstract [Abstract]
Disclosure Of Noncurrent Assets Or Disposal Groups Classified As Held For Sale Explanatory	18. Assets Held for Sale 18.1 Details of assets held for sale as of December 31, 2019 and 2020, are as follows: December 31, 2019 Acquisition Accumulated Carrying Fair value less (In millions of Korean won) Land held for sale ￦ 14,542 ￦ (1,530 ) ￦ 13,012 ￦ 14,374 Buildings held for sale 11,391 (1,252 ) 10,139 12,396 ￦ 25,933 ￦ (2,782 ) ￦ 23,151 ￦ 26,770 December 31, 2020 Acquisition Accumulated Carrying Fair value less (In millions of Korean won) Land held for sale ￦ 80,740 ￦ (16,169 ) ￦ 64,571 ￦ 68,321 Buildings held for sale 152,426 (24,887 ) 127,539 134,247 Other assets held for sale 10,676 (5,059 ) 5,617 5,801 ￦ 243,842 ￦ (46,115 ) ￦ 197,727 ￦ 208,369 * Acquisition cost of buildings held for sale is net of accumulated depreciation before classified as assets held for sale. 18.2 Valuation techniques and inputs that are used to measure the fair value of assets held for sale as of December 31, 2020 are as follows: December 31, 2020 Fair value Valuation 1 Unobservable 2 Estimated range of Effect of (In millions of Korean won) Land and buildings ￦ 208,369 Market comparison Adjustment index 0.68 ~ 1.95 Fair value increases 1 The appraisal value is adjusted by the adjustment ratio in the event the public sale is unsuccessful. 2 Adjustment index is calculated using the time factor correction or local factors or individual factors. Among assets held for sale, real estate was measured by independent appraisers with recent experience in evaluating similar properties in the area of the property to be assessed with professional qualifications. All of assets held for sale are classified as level 3 in accordance with fair value hierarchy in Note 6.1.2. 18.3 Changes in accumulated impairment losses of assets held for sale for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Provision Reversal Others Ending (In millions of Korean won) Accumulated impairment losses of assets held for sale ￦ (8,150 ) ￦ (333 ) ￦ — ￦ 5,701 ￦ (2,782 ) 2020 Beginning Provision Reversal Business Others Ending (In millions of Korean won) Accumulated impairment losses of assets held for sale ￦ (2,782 ) ￦ (11,593 ) ￦ — ￦ (45,433 ) ￦ 13,693 ￦ (46,115 ) 18.4 As of December 31, 2020, assets held for sale consist of 4 real estates of closed offices and 1,087 foreclosure assets on loans of PT Bank Bukopin TBK, which were determined to sell by the management, but not yet sold as of December 31, 2020. Negotiation with buyers is in process for the one closed office and the remaining 1,090 assets are also being actively marketed.

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2020
Miscellaneous Assets Abstract [Abstract]
Disclosure Of Other Assets Explanatory	19. Other Assets 19.1 Details of other assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Other financial assets Other receivables ￦ 5,792,814 ￦ 10,628,272 Accrued income 1,659,182 1,726,651 Guarantee deposits 1,146,000 1,099,618 Domestic exchange settlement debits 531,356 722,616 Others 129,039 117,330 Allowances for credit losses (104,629 ) (119,762 ) Present value discount (6,703 ) (7,036 ) 9,147,059 14,167,689 Other non-financial Other receivables 1,294 1,091 Prepaid expenses 198,893 254,152 Guarantee deposits 4,084 3,906 Insurance assets 1,662,016 2,376,679 Separate account assets 5,052,804 10,210,047 Others 2,173,693 3,158,993 Allowances for credit losses (24,235 ) (17,520 ) 9,068,549 15,987,348 ￦ 18,215,608 ￦ 30,155,037 19.2 Changes in allowances for credit losses of other assets for the years ended December 31, 2019 and 2020, are as follows: 2019 Other financial Other non-financial Total (In millions of Korean won) Beginning ￦ 106,275 ￦ 24,780 ￦ 131,055 Write-offs (5,883 ) (152 ) (6,035 ) Provision (reversal) 9,885 (393 ) 9,492 Others (5,648 ) — (5,648 ) Ending ￦ 104,629 ￦ 24,235 ￦ 128,864 2020 Other financial Other non-financial Total (In millions of Korean won) Beginning ￦ 104,629 ￦ 24,235 ￦ 128,864 Write-offs (6,517 ) (8,503 ) (15,020 ) Provision 22,153 1,726 23,879 Business combination 7,946 59 8,005 Others (8,449 ) 3 (8,446 ) Ending ￦ 119,762 ￦ 17,520 ￦ 137,282

Financial Liabilities at Fair V

Financial Liabilities at Fair Value through Profit or Loss	12 Months Ended
	Dec. 31, 2020
Financial Liabilities At Fair Value Through Profit Or Loss Abstract [Abstract]
Disclosure Of Financial Liabilities At Fair Value Through Profit Or Loss Explanatory	20. Financial Liabilities at Fair Value through Profit or Loss 20.1 Details of financial liabilities at fair value through profit or loss, and financial liabilities designated at fair value through profit or loss as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Financial liabilities at fair value through profit or loss Borrowed securities sold ￦ 2,583,092 ￦ 1,934,735 Other 80,235 91,216 2,663,327 2,025,951 Financial liabilities designated at fair value through profit or loss Derivative-linked securities 12,704,826 9,784,107 12,704,826 9,784,107 ￦ 15,368,153 ￦ 11,810,058 20.2 Difference between the carrying amount and contractual cash flow amount of financial liabilities designated at fair value through profit or loss as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Contractual cash flow amount ￦ 12,515,734 ￦ 9,583,186 Carrying amount 12,704,826 9,784,107 Difference ￦ (189,092 ) ￦ (200,921 )

Deposits

Deposits	12 Months Ended
	Dec. 31, 2020
Deposits From Customers Abstract [Abstract]
Disclosure Of Deposits From Customers Explanatory	21. Deposits Details of deposits as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Demand deposits Demand deposits in Korean won ￦ 127,790,349 ￦ 162,155,728 Demand deposits in foreign currencies 8,550,068 14,473,832 136,340,417 176,629,560 Time deposits Time deposits in Korean won 157,653,603 149,435,968 157,653,603 149,435,968 Time deposits in foreign currencies 7,377,173 10,043,679 Fair value adjustments on fair value hedged time deposits in foreign currencies (18,391 ) 2,089 7,358,782 10,045,768 165,012,385 159,481,736 Certificates of deposits 4,239,969 2,468,924 ￦ 305,592,771 ￦ 338,580,220

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2020
Disclosure Of Detailed Information About Borrowings Abstract [Abstract]
Disclosure Of Detailed Information About Borrowings Explanatory	22. Borrowings 22.1 Details of borrowings as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) General borrowings ￦ 24,370,567 ￦ 32,312,859 Bonds sold under repurchase agreements and others 13,015,506 16,334,365 Call money 432,787 1,179,932 ￦ 37,818,860 ￦ 49,827,156 22.2 Details of general borrowings as of December 31, 2019 and 2020, are as follows: Lenders Annual December 31, 2019 December 31, 2020 (In millions of Korean won) Borrowings in Korean won Borrowings from the Bank of Korea The Bank of Korea 0.25 ￦ 2,649,851 ￦ 6,463,267 Borrowings from the government SEMAS and others 0.00 ~ 2.70 1,658,810 2,675,568 Borrowings from banks Shinhan Bank and others 1.55 ~ 3.01 116,160 137,952 Borrowings from non-banking Korea Securities Finance Corporation and others 0.20 ~ 4.74 1,982,242 2,203,702 Other borrowings The Korea Development Bank and others 0.00 ~ 5.20 8,022,921 9,717,382 14,429,984 21,197,871 Borrowings in foreign currencies Due to banks Commonwealth Bank of Australia and others — 4,682 292 Borrowings from banks Central Bank of Uzbekistan and others 0.00 ~ 8.84 8,089,368 9,839,110 Borrowings from other financial institutions The Export-Import Bank of Korea and others 0.70 ~ 1.47 7,081 23,827 Other borrowings Bank of New York Mellon and others 0.00 ~ 2.80 1,839,452 1,251,759 9,940,583 11,114,988 ￦ 24,370,567 ￦ 32,312,859 22.3 Details of bonds sold under repurchase agreements and others as of December 31, 2019 and 2020, are as follows: Lenders Annual December 31, 2019 December 31, 2020 (In millions of Korean won) Bonds sold under repurchase agreements Individuals, groups and corporations 0.25~3.00 ￦ 13,011,121 ￦ 16,329,799 Bills sold Counter sale 0.10~0.35 4,385 4,566 ￦ 13,015,506 ￦ 16,334,365 22.4 Details of call money as of December 31, 2019 and 2020, are as follows: Lenders Annual December 31, 2019 December 31, 2020 (In millions of Korean won) Call money in Korean won The Export-Import Bank of Korea and others 0.48~0.85 ￦ 165,000 ￦ 510,000 Call money in foreign currencies Central Bank of Uzbekistan and others 0.00~0.34 267,787 669,932 ￦ 432,787 ￦ 1,179,932

Debentures

Debentures	12 Months Ended
	Dec. 31, 2020
Disclosure Of Detailed Information About Debentures Abstract [Abstract]
Disclosure Of Detailed Information About Debentures Explanatory	23. Debentures 23.1 Details of debentures as of December 31, 2019 and 2020, are as follows: Annual December 31, 2019 December 31, 2020 (In millions of Korean won) Debentures in Korean won Structured debentures 5.65 ~ 5.86 ￦ 33,310 ￦ 1,960 Exchangeable bonds* 0.00 — 240,000 Subordinated fixed rate debentures 2.02 ~ 4.35 3,386,590 4,834,407 Fixed rate debentures 0.00 ~ 3.50 40,596,755 47,229,619 Floating rate debentures 0.58 ~ 1.55 1,580,000 3,190,000 45,596,655 55,495,986 Fair value adjustments of fair value hedged debentures in Korean won 21,070 (6,839 ) Less: Discount on debentures in Korean won (30,029 ) (32,028 ) Less: Adjustment for exchangeable rights in Korean won — (14,957 ) 45,587,696 55,442,162 Debentures in foreign currencies Floating rate debentures 0.58 ~ 1.51 2,227,607 2,232,938 Fixed rate debentures 0.05 ~ 13.50 3,094,196 5,030,580 5,321,803 7,263,518 Fair value adjustments of fair value hedged debentures in foreign currencies 41,406 81,333 Less: Discount on debentures in foreign currencies (15,322 ) (26,326 ) 5,347,887 7,318,525 ￦ 50,935,583 ￦ 62,760,687 * Fair value of the liability component of exchangeable bonds is calculated by using market interest rates of bonds under the same conditions without the exchangeable rights. The residual amount after deducting the liability component from the issuance amount, represents the value of the exchangeable rights and is recorded in equity. Shares to be exchanged are 5 million treasury shares of KB Financial Group Inc. with the exchange price of ￦ 48,000. Exercise period for exchangeable rights is from the 60th day from the issuance date to 10 days before the maturity date. 23.2 Changes in debentures based on face value for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Issue Repayment Others Ending (In millions of Korean won) Debentures in Korean won Structured debentures ￦ 34,320 ￦ — ￦ (1,010 ) ￦ — ￦ 33,310 Subordinated fixed rate debentures 3,437,729 — (51,139 ) — 3,386,590 Fixed rate debentures 43,466,085 91,960,041 (94,829,371 ) — 40,596,755 Floating rate debentures 1,650,000 570,000 (640,000 ) — 1,580,000 48,588,134 92,530,041 (95,521,520 ) — 45,596,655 Debentures in foreign currencies Floating rate debentures 1,791,868 532,380 (33,199 ) (63,442 ) 2,227,607 Fixed rate debentures 2,951,251 595,490 (590,950 ) 138,405 3,094,196 4,743,119 1,127,870 (624,149 ) 74,963 5,321,803 ￦ 53,331,253 ￦ 93,657,911 ￦ (96,145,669 ) ￦ 74,963 ￦ 50,918,458 2020 Beginning Issue Repayment Business Others Ending (In millions of Korean won) Debentures in Korean won Structured debentures ￦ 33,310 ￦ — ￦ (1,350 ) ￦ — ￦ (30,000 ) ￦ 1,960 Exchangeable bonds — 240,000 — — — 240,000 Subordinated fixed rate debentures 3,386,590 2,150,000 (702,183 ) — — 4,834,407 Fixed rate debentures 40,596,755 111,677,084 (105,044,220 ) — — 47,229,619 Floating rate debentures 1,580,000 2,010,000 (400,000 ) — — 3,190,000 45,596,655 116,077,084 (106,147,753 ) — (30,000 ) 55,495,986 Debentures in foreign currencies Floating rate debentures 2,227,607 823,478 (675,075 ) — (143,072 ) 2,232,938 Fixed rate debentures 3,094,196 2,909,967 (937,972 ) 277,087 (312,698 ) 5,030,580 5,321,803 3,733,445 (1,613,047 ) 277,087 (455,770 ) 7,263,518 ￦ 50,918,458 ￦ 119,810,529 ￦ (107,760,800 ) ￦ 277,087 ￦ (485,770 ) ￦ 62,759,504

Provisions

Provisions	12 Months Ended
	Dec. 31, 2020
Additional Provisions Other Provisions Abstract [Abstract]
Disclosure Of Provisions Explanatory	24. Provisions 24.1 Details of provisions as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Provisions for credit losses of unused loan commitments ￦ 208,148 ￦ 298,753 Provisions for credit losses of acceptances and guarantees 77,759 62,254 Provisions for credit losses of financial guarantee contracts 6,063 6,348 Provisions for restoration costs 120,340 151,696 Others 115,619 195,852 ￦ 527,929 ￦ 714,903 24.2 Changes in provisions for credit losses of unused loan commitments, acceptances and guarantees for the years ended December 31, 2019 and 2020, are as follows: 2019 Provisions for credit losses of unused Provisions for credit losses of 12-month Lifetime expected 12-month Lifetime expected Non- impaired Impaired Non- impaired Impaired (In millions of Korean won) Beginning ￦ 132,876 ￦ 68,920 ￦ 8,881 ￦ 27,084 ￦ 30,109 ￦ 17,982 Transfer between stages Transfer to 12-month 32,622 (31,408 ) (1,214 ) 365 (365 ) — Transfer to lifetime expected credit losses (16,932 ) 17,195 (263 ) (975 ) 1,705 (729 ) Impairment (422 ) (1,516 ) 1,938 (24 ) (280 ) 304 Provision (reversal) for credit losses (21,171 ) 18,036 45 (1,763 ) 4,584 (893 ) Others (exchange differences, etc.) 324 237 — 274 259 122 Ending ￦ 127,297 ￦ 71,464 ￦ 9,387 ￦ 24,961 ￦ 36,012 ￦ 16,786 24.2 Changes in provisions for credit losses of unused loan commitments, acceptances and guarantees for the years ended December 31, 2019 and 2020, are as follows: (cont’d) 2020 Provisions for credit losses of unused Provisions for credit losses of 12-month Lifetime expected credit losses 12-month Lifetime expected credit losses Non- impaired Impaired Non- impaired Impaired (In millions of Korean won) Beginning ￦ 127,297 ￦ 71,464 ￦ 9,387 ￦ 24,961 ￦ 36,012 ￦ 16,786 Transfer between stages Transfer to 12-month 23,318 (21,694 ) (1,624 ) 194 (191 ) (3 ) Transfer to lifetime expected credit losses (13,431 ) 15,991 (2,560 ) (486 ) 486 — Impairment (304 ) (3,474 ) 3,778 (5 ) (461 ) 466 Provision (reversal) for credit losses* 24,583 65,449 (412 ) 9,482 (20,389 ) (2,734 ) Business combination 19,426 — — — — — Others (exchange differences, etc.) (18,168 ) (273 ) — (1,058 ) (619 ) (187 ) Ending ￦ 162,721 ￦ 127,463 ￦ 8,569 ￦ 33,088 ￦ 14,838 ￦ 14,328 * Includes additional provision of ￦ 14,974 million for industries and borrowers which are highly affected by COVID-19, (non-impaired) 24.3 Changes in provisions for credit losses of financial guarantee contracts for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 (In millions of Beginning ￦ 4,275 ￦ 6,063 Provision 1,865 280 Others (77 ) 5 Ending ￦ 6,063 ￦ 6,348 24.4 Changes in provisions for restoration costs for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 (In millions of Korean won) Beginning ￦ 108,000 ￦ 120,340 Provision 7,037 14,192 Reversal (7,178 ) (2,010 ) Used (5,211 ) (9,469 ) Unwinding of discount 2,237 2,372 Effect of changes in discount rate 15,455 23,886 Business combination — 2,385 Ending ￦ 120,340 ￦ 151,696 Provisions for restoration costs are the present value of estimated costs to be incurred for the restoration of the leased properties. The expenditure of the restoration cost will be incurred at the end of each lease contract, and the lease period is used to reasonably estimate the time of expenditure. Also, the average restoration expense based on actual three-year historical data and three-year historical average inflation rate were used to estimate the present value of estimated costs. 24.5 Changes in other provisions for the years ended December 31, 2019 and 2020, are as follows: 2019 Membership Dormant Litigations Others* Total (In millions of Korean won) Beginning ￦ 12,654 ￦ 4,377 ￦ 21,190 ￦ 89,511 ￦ 127,732 Increase 56,758 2,378 23,863 38,025 121,024 Decrease (54,743 ) (3,176 ) (16,363 ) (58,855 ) (133,137 ) Ending ￦ 14,669 ￦ 3,579 ￦ 28,690 ￦ 68,681 ￦ 115,619 2020 Membership Dormant Litigations Others* Total (In millions of Korean won) Beginning ￦ 14,669 ￦ 3,579 ￦ 28,690 ￦ 68,681 ￦ 115,619 Increase 76,138 2,607 19,186 89,361 187,292 Decrease (71,306 ) (3,179 ) (9,725 ) (28,173 ) (112,383 ) Business combination — — 2,366 2,958 5,324 Ending ￦ 19,501 ￦ 3,007 ￦ 40,517 ￦ 132,827 ￦ 195,852 * Provisions for incomplete sales of cardssurance are ￦ 2,532 million and ￦ 1,319 million, as of December 31, 2019 and 2020, respectively.

Net Defined Benefit Liabilities

Net Defined Benefit Liabilities	12 Months Ended
	Dec. 31, 2020
Disclosure Of Defined Benefit Plans Abstract [Abstract]
Disclosure Of Defined Benefit Plans Explanatory	25. Net Defined Benefit Liabilities 25.1 Defined Benefit Plan The Group operates defined benefit plans which have the following characteristics: • The Group has the obligation to pay the agreed benefits to all its current and former employees. • The Group assumes actuarial risk (that benefits will cost more than expected) and investment risk. The net defined benefit liability recognized in the consolidated statement of financial position is calculated by independent actuaries in accordance with actuarial valuation methods. The net defined benefit obligation is calculated using the Projected Unit Credit method (the ‘PUC’). Data used in the PUC such as interest rates, future salary increase rate, mortality rate and consumer price index are based on observable market data and historical data which are updated annually. Actuarial assumptions may differ from actual results, due to changes in the market, economic trends and mortality trends which may impact defined benefit liabilities and future payments. Actuarial gains and losses arising from changes in actuarial assumptions are recognized in the period incurred through other comprehensive income. 25.2 Changes in net defined benefit liabilities for the years ended December 31, 2019 and 2020, are as follows: 2019 Present value of Fair value of plan Net defined benefit (In millions of Korean won) Beginning ￦ 2,172,260 ￦ (1,910,047 ) ￦ 262,213 Current service cost 226,788 — 226,788 Past service cost 2,276 — 2,276 Interest expense (income) 48,795 (43,250 ) 5,545 Remeasurements: Actuarial gains or losses by changes in demographic assumptions (3,122 ) — (3,122 ) Actuarial gains or losses by changes in financial assumptions 61,547 — 61,547 Actuarial gains or losses by experience adjustments 7,458 — 7,458 Return on plan assets (excluding amounts included in interest income) — 11,116 11,116 Contributions by the Group — (288,420 ) (288,420 ) Payments from plans (benefit payments) (141,820 ) 141,798 (22 ) Payments from the Group (32,556 ) — (32,556 ) Transfer in 7,775 (7,425 ) 350 Transfer out (7,517 ) 7,517 — Effect of exchange differences (2 ) — (2 ) Others (129 ) 1 (128 ) Ending* ￦ 2,341,753 ￦ (2,088,710 ) ￦ 253,043 2020 Present value of Fair value of plan Net defined benefit (In millions of Korean won) Beginning ￦ 2,341,753 ￦ (2,088,710 ) ￦ 253,043 Current service cost 232,147 — 232,147 Past service cost 3,269 — 3,269 Gains on settlement (1,912 ) — (1,912 ) Interest expense (income) 46,178 (41,435 ) 4,743 Remeasurements: Actuarial gains and losses by changes in demographic assumptions (9,611 ) — (9,611 ) Actuarial gains and losses by changes in financial assumptions 789 — 789 Actuarial gains and losses by experience adjustments 16,292 — 16,292 Return on plan assets (excluding amounts included in interest income) — 6,308 6,308 Contributions by the Group — (268,918 ) (268,918 ) Contributions by the employees — (248 ) (248 ) Payments from plans (settlement) (8,162 ) 8,162 — Payments from plans (benefit payments) (148,468 ) 144,546 (3,922 ) Payments from the Group (34,361 ) — (34,361 ) Transfer in 9,673 (9,027 ) 646 Transfer out (8,635 ) 8,635 — Effect of exchange differences (724 ) 5 (719 ) Effect of business acquisition and disposal 110,080 (62,271 ) 47,809 Others 26 — 26 Ending* ￦ 2,548,334 ￦ (2,302,953 ) ￦ 245,381 * The net defined benefit liabilities of ￦ 253,043 million is calculated by subtracting ￦ 946 million net defined benefit assets from ￦ 253,989 million net defined benefit liabilities as of December 31, 2019. The net defined benefit liabilities of ￦ 245,381 million is calculated by subtracting ￦ 2,845 million net defined benefit assets from ￦ 248,226 million net defined benefit liabilities as of December 31, 2020. 25.3 Details of net defined benefit liabilities as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Present value of defined benefit obligation ￦ 2,341,753 ￦ 2,548,334 Fair value of plan assets (2,088,710 ) (2,302,953 ) Net defined benefit liabilities ￦ 253,043 ￦ 245,381 25.4 Details of post-employment benefits recognized in profit or loss as employee compensation and benefits for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Current service cost ￦ 208,470 ￦ 226,788 ￦ 232,147 Past service cost 7,912 2,276 3,269 Net interest expenses on net defined benefit liabilities 3,833 5,545 4,743 Gains on settlement (1,000 ) — (1,912 ) Post-employment benefits * ￦ 219,215 ￦ 234,609 ￦ 238,247 * Includes post-employment benefits amounting to ￦ 2,575 million recognized as other operating expense and ￦ 121 million recognized as prepayment for the year ended December 31, 2019 and post-employment benefits amounting to ￦ 2,840 million recognized as other operating expense and ￦ 176 million recognized as prepayment for the year ended December 31, 2020. 25.5 Details of remeasurements of net defined benefit liabilities recognized as other comprehensive income (loss) for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Remeasurements: Return on plan assets (excluding amounts included in interest income) ￦ (22,420 ) ￦ (11,116 ) ￦ (6,308 ) Actuarial gains or losses (167,973 ) (65,883 ) (7,470 ) Income tax effects 52,377 21,172 3,792 Effect of exchange difference — — (399 ) Remeasurements after income tax ￦ (138,016 ) ￦ (55,827 ) ￦ (10,385 ) 25.6 Details of fair value of plan assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 Assets quoted Assets not Total (In millions of Korean won) Cash and due from financial institutions ￦ — ￦ 2,087,861 ￦ 2,087,861 Investment fund — 849 849 ￦ — ￦ 2,088,710 ￦ 2,088,710 December 31, 2020 Assets quoted Assets not Total (In millions of Korean won) Cash and due from financial institutions ￦ — ￦ 2,299,500 ￦ 2,299,500 Derivative instruments — 1,930 1,930 Investment fund — 1,523 1,523 ￦ — ￦ 2,302,953 ￦ 2,302,953 25.7 Details of key actuarial assumptions used as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 Discount rate (%) 1.60~2.00 0.90~2.00 Salary increase rate (%) 0.00~7.50 0.00~7.50 Turnover (%) 0.00~50.00 0.00~50.00 Mortality assumptions are based on the experience-based mortality table issued by Korea Insurance Development Institute in 2019. 25.8 Sensitivity analysis results of significant actuarial assumptions as of December 31, 2020, are as follows: Changes in principal Effect on net defined benefit obligation Increase in principal Decrease in principal Discount rate 0.5 %p 4.34% decrease 4.12% increase Salary increase rate 0.5 %p 1.41% increase 6.41% decrease Turnover 0.5 %p 0.94% decrease 0.39% increase The above sensitivity analyses are based on a change in an assumption while holding all other assumptions constant. In practice, this is unlikely to occur, and changes in some of the assumptions may be correlated. The sensitivity of the defined benefit obligation to changes in principal actuarial assumptions is calculated using the same projected unit credit method used in calculating the defined benefit obligations recognized in the consolidated statement of financial position. 25.9 Expected maturity analysis of undiscounted pension benefits (including expected future benefit) as of December 31, 2020 are as follows: Up to 1 year 1~2 years 2~5 years 5~10 years Over 10 years Total (In millions of Korean won) Pension benefits* ￦ 98,050 ￦ 182,432 ￦ 706,187 ￦ 1,415,615 ￦ 3,829,749 ￦ 6,232,033 * Amount determined under the promotion compensation type defined contribution plan is excluded. The weighted average duration of the defined benefit obligation is 1.0 ~ 11.5 years . 25.10 Expected contribution to plan assets for the next annual reporting period after December 31, 2020 is estimated to be ￦ 221,271 million.

Other Liabilities

Other Liabilities	12 Months Ended
	Dec. 31, 2020
Miscellaneous Liabilities Abstract [Abstract]
Disclosure Of Other Liabilities Explanatory	26. Other Liabilities Details of other liabilities as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Other financial liabilities Other payables ￦ 9,485,597 ￦ 14,247,067 Prepaid card and debit card payables 27,555 31,184 Accrued expenses 3,066,445 2,787,360 Financial guarantee liabilities 46,428 49,286 Deposits for letter of guarantees and others 862,968 1,103,876 Domestic exchange settlement credits 2,079,636 938,039 Foreign exchanges settlement credits 114,316 134,678 Borrowings from other business accounts 256 — Due to trust accounts 5,216,460 7,542,955 Liabilities incurred from agency relationships 771,609 765,844 Account for agency businesses 407,475 400,507 Dividend payables 473 478 Lease liabilities 544,439 559,113 Others 5,930 51,901 22,629,587 28,612,288 Other non-financial Other payables 283,771 386,094 Unearned revenue 465,501 669,908 Accrued expenses 716,180 815,941 Deferred revenue on credit card points 206,188 211,815 Withholding taxes 158,992 180,092 Separate account liabilities 5,047,080 10,701,404 Others 229,960 226,481 7,107,672 13,191,735 ￦ 29,737,259 ￦ 41,804,023

Equity

Equity	12 Months Ended
	Dec. 31, 2020
Equity Abstract [Abstract]
Disclosure Of Share Capital Reserves And Other Equity Interest Explanatory	27. Equity 27.1 Share Capital Details of share capital as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 Type of share Ordinary share Ordinary share (In millions of Korean won and in number of shares) Number of authorized shares 1,000,000,000 1,000,000,000 Par value per share (In Korean won) ￦ 5,000 ￦ 5,000 Number of issued shares 415,807,920 415,807,920 Share capital ￦ 2,090,558 ￦ 2,090,558 Changes in outstanding shares for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 (In number of shares) Beginning 395,551,297 389,634,335 Increase — — Decrease (5,916,962 ) — Ending 389,634,335 389,634,335 27.2 Hybrid Securities Details of hybrid securities classified as equity as of December 31, 2019 and 2020, are as follows: Issuance date Maturity Interest rate December 31, 2019 December 31, 2020 (In millions of Korean won) The 1-1st May 2, 2019 Perpetual bond 3.23 ￦349,309 ￦349,309 The 1-2nd May 2, 2019 Perpetual bond 3.44 49,896 49,896 The 2-1st Hybrid securities May 8, 2020 Perpetual bond 3.30 — 324,099 The 2-2nd May 8, 2020 Perpetual bond 3.43 — 74,812 The 3-1st July 14, 2020 Perpetual bond 3.17 — 369,099 The 3-2nd July 14, 2020 Perpetual bond 3.38 — 29,922 The 4-1st Oct 20, 2020 Perpetual bond 3.00 — 433,996 The 4-2nd Oct 20, 2020 Perpetual bond 3.28 — 64,855 ￦399,205 ￦1,695,988 The above hybrid securities are early redeemable by the Group after 5 or 10 years from the issuance date. On the other hand, hybrid securities of ￦ 574,580 million issued by Kookmin Bank are recognized as non-controlling 27.3 Capital Surplus Details of capital surplus as of December 31, 2019 and 2020, are as follows December 31, 2019 December 31, 2020 (In millions of Korean won) Paid-in ￦ 13,190,274 ￦ 13,190,274 Loss on sales of treasury shares (481,332 ) (481,332 ) Other capital surplus 4,413,835 4,002,714 Consideration for exchangeable rights — 11,933 ￦ 17,122,777 ￦ 16,723,589 27.4 Accumulated Other Comprehensive Income Details of accumulated other comprehensive income as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Remeasurements of net defined benefit liabilities ￦ (290,228 ) ￦ (300,324 ) Exchange differences on translating foreign operations 31,793 (131,113 ) Net gains on financial instruments at fair value through other comprehensive income 487,331 717,230 Share of other comprehensive income (loss) of associates and joint ventures 3,318 (3,529 ) Losses on cash flow hedging instruments (27,333 ) (28,597 ) Gains (losses) on hedging instruments of net investments in foreign operations (41,992 ) 22,277 Other comprehensive income arising from separate account 18,381 8,698 Fair value changes on financial liabilities designated at fair value due to own credit risk (20,326 ) (11,507 ) Net gains on overlay approach adjustment 187,077 339,202 ￦ 348,021 ￦ 612,337 27.5 Retained Earnings Details of retained earnings as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 2 (In millions of Korean won) Legal reserves 1 ￦ 482,807 ￦ 557,405 Voluntary reserves 982,000 982,000 Unappropriated retained earnings 18,244,738 20,977,987 ￦ 19,709,545 ￦ 22,517,392 1 With respect to the allocation of net profit earned in a fiscal term, the Parent Company must set aside in its legal reserve an amount equal to at least 10% of its profit after tax as reported in the financial statements, each time it pays dividends on its net profits earned until its legal reserve reaches at least the aggregate amount of its paid-in 2 Retained earnings restricted for dividend at subsidiaries level pursuant to law and regulations amounts to ￦ 3,587,439 million as of December 31, 2020. 27.6 Treasury Shares Changes in treasury shares for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Acquisition Disposal Ending (In millions of Korean won and in number of shares) Number of treasury shares 22,560,240 5,916,962 (2,303,617 ) 26,173,585 Carrying amount ￦ 968,549 ￦ 267,639 ￦ (100,000 ) ￦ 1,136,188 2020 Beginning Acquisition Disposal Ending (In millions of Korean won and in number of shares) Number of treasury shares* 26,173,585 — — 26,173,585 Carrying amount ￦ 1,136,188 ￦ — ￦ — ￦ 1,136,188 * 5,000,000 treasury shares are deposited at the Korea Securities Depository for issuing exchangeable bonds.

Net Interest Income

Net Interest Income	12 Months Ended
	Dec. 31, 2020
Interest Revenue Or Expense Net Abstract [Abstract]
Disclosure Of Interest Income Expense Explanatory	28. Net Interest Income Details of interest income, expense and net interest income for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Interest income Due from financial institutions measured at fair value through profit or loss ￦ 9,236 ￦ 2,685 ￦ 649 Securities measured at fair value through profit or loss 713,058 668,377 647,840 Loans measured at fair value through profit or loss 26,066 33,001 10,876 Securities measured at fair value through other comprehensive income 718,327 774,864 719,434 Loans measured at fair value through other comprehensive income 2,373 14,708 7,899 Due from financial institutions measured at amortized cost 109,155 150,635 92,155 Securities measured at amortized cost 604,709 599,519 627,201 Loans measured at amortized cost 11,431,359 12,247,493 12,177,822 Others 120,286 147,905 201,871 13,734,569 14,639,187 14,485,747 Interest expenses Deposits 3,041,739 3,481,121 2,916,794 Borrowings 544,562 596,425 572,946 Debentures 1,148,729 1,240,566 1,186,310 Others 94,611 124,288 87,423 4,829,641 5,442,400 4,763,473 Net interest income ￦ 8,904,928 ￦ 9,196,787 ￦ 9,722,274 Interest income recognized on impaired loans is ￦48,974 million, ￦ 54,033 million and ￦ 56,606 million for the years ended December 31, 2018, 2019 and 2020, respectively.

Net Fee and Commission Income

Net Fee and Commission Income	12 Months Ended
	Dec. 31, 2020
Fee And Commission Income Expense Abstract [Abstract]
Disclosure Of Fee And Commission Income Expense Explanatory	29. Net Fee and Commission Income Details of fee and commission income, expense and net fee and commission income for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Fee and commission income Banking activity fees ￦ 208,443 ￦ 214,512 ￦ 189,100 Lending activity fees 74,340 83,916 91,663 Credit card and debit card related fees 1,360,515 1,316,636 1,378,450 Agent activity fees 149,585 172,211 196,518 Trust and other fiduciary fees 363,767 388,352 331,827 Fund management related fees 132,657 153,798 154,612 Acceptances and guarantees fees 44,104 48,122 54,108 Foreign currency related fees 124,201 134,145 173,313 Securities agency fees 167,071 145,846 172,097 Other business account commission on consignment 36,947 36,813 40,461 Commissions received on securities business 518,309 445,987 793,278 Lease fees 246,537 428,195 636,301 Others 291,244 310,714 315,296 3,717,720 3,879,247 4,527,024 Fee and commission expense Trading activity related fees* 31,889 28,869 38,497 Lending activity fees 25,734 26,040 33,444 Credit card and debit card related fees 907,831 892,391 848,823 Outsourcing related fees 164,594 190,312 216,962 Foreign currency related fees 43,053 42,902 49,435 Others 301,243 343,729 380,924 1,474,344 1,524,243 1,568,085 Net fee and commission income ￦ 2,243,376 ￦ 2,355,004 ￦ 2,958,939 * Fees from financial instruments at fair value through profit or loss.

Net Gains or Losses on Financia

Net Gains or Losses on Financial Instruments at Fair Value through Profit or Loss	12 Months Ended
	Dec. 31, 2020
Net Gains Or Losses On Financial Assets Liabilities At Fair Value Through Profit Or Loss Abstract [Abstract]
Net Gains Or Losses On Financial Assets Liabilities At Fair Value Through Profit Or Loss Explanatory	30. Net Gains or Losses on Financial Instruments at Fair Value through Profit or Loss 30.1 Net Gains or Losses on Financial Instruments at Fair Value through Profit or Loss Net gains or losses on financial instruments at fair value through profit or loss include dividend income and gains or losses arising from changes in fair values, sales and redemptions. Details of net gains or losses on financial instruments at fair value through profit or loss for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Gains on financial instruments at fair value through profit or loss Financial assets at fair value through profit or loss Debt securities ￦ 1,544,892 ￦ 1,613,946 ￦ 2,061,505 Equity securities 571,404 428,646 725,072 2,116,296 2,042,592 2,786,577 Derivatives held for trading Interest rate 2,328,576 2,685,998 2,632,246 Currency 3,764,985 5,251,597 8,335,594 Stock or stock index 1,383,446 2,612,422 2,808,284 Credit 38,461 41,548 28,434 Commodity 8,285 15,240 18,097 Other 92,947 212,731 231,901 7,616,700 10,819,536 14,054,556 Financial liabilities at fair value through profit or loss 72,410 46,750 28,160 Other financial instruments 22 5,811 689 9,805,428 12,914,689 16,869,982 Losses on financial instruments at fair value through profit or loss Financial assets at fair value through profit or loss Debt securities 850,129 752,999 1,040,285 Equity securities 475,968 315,743 444,554 1,326,097 1,068,742 1,484,839 Derivatives held for trading Interest rate 2,610,305 2,758,205 2,687,114 Currency 3,499,356 5,118,095 8,191,456 Stock or stock index 1,626,007 1,585,086 2,558,205 Credit 36,747 42,172 19,213 Commodity 10,456 9,437 21,797 Other 117,741 190,979 253,406 7,900,612 9,703,974 13,731,191 Financial liabilities at fair value through profit or loss 134,287 94,426 153,227 Other financial instruments 60 5,704 116 9,361,056 10,872,846 15,369,373 Net gains on financial instruments at fair value through profit or loss ￦ 444,372 ￦ 2,041,843 ￦ 1,500,609 30.2 Net Gains or Losses on Financial Instruments Designated at Fair Value through Profit or Loss Net gains or losses on financial instruments designated at fair value through profit or loss include dividend income and gains or losses arising from changes in fair values, sales and redemptions. Details of net gains or losses on financial instruments designated at fair value through profit or loss for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Gains on financial instruments designated at fair value through profit or loss Financial liabilities designated at fair value through profit or loss ￦ 667,508 ￦ 555,749 ￦ 654,045 667,508 555,749 654,045 Losses on financial instruments designated at fair value through profit or loss Financial liabilities designated at fair value through profit or loss 760,577 1,953,720 1,143,288 760,577 1,953,720 1,143,288 Net losses on financial instruments designated at fair value through profit or loss ￦ (93,069 ) ￦ (1,397,971 ) ￦ (489,243 )

Net Other Operating Income And

Net Other Operating Income And Expenses	12 Months Ended
	Dec. 31, 2020
Other Operating Income And Expenses Abstract [Abstract]
Disclosure Of Other Operating Income Expense Explanatory	31. Net Other Operating Income and Expenses Details of other operating income and expenses for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Other operating income Gains related to financial instruments at fair value through other comprehensive income Gains on redemption of financial instruments at fair value through other comprehensive income ￦ 259 ￦ 796 ￦ 351 Gains on disposal of financial instruments at fair value through other comprehensive income 134,875 222,371 304,217 135,134 223,167 304,568 Gains related to financial assets at amortized cost Gains on sale of loans measured at amortized cost 46,877 80,746 180,038 Gains on disposal of securities measured at amortized cost — — 229 46,877 80,746 180,267 Gains on foreign exchange transactions 1,600,161 2,183,703 3,634,987 Dividend income 83,930 54,768 45,125 Others 260,709 321,244 591,798 2,126,811 2,863,628 4,756,745 Other operating expenses Losses related to financial instruments at fair value through other comprehensive income Losses on redemption of financial instruments at fair value through other comprehensive income 17 — 320 Losses on disposal of financial instruments at fair value through other comprehensive income 35,864 16,975 19,159 35,881 16,975 19,479 Losses related to financial assets at amortized cost Losses on sale of loans measured at amortized cost 9,006 19,439 16,061 Losses on disposal of securities measured at amortized cost — — 6,513 9,006 19,439 22,574 Losses on foreign exchanges transactions 1,539,837 1,970,294 3,530,618 Others 1,672,123 1,920,244 2,684,004 3,256,847 3,926,952 6,256,675 Net other operating expenses ￦ (1,130,036 ) ￦ (1,063,324 ) ￦ (1,499,930 )

General and Administrative Expe

General and Administrative Expenses	12 Months Ended
	Dec. 31, 2020
General And Administrative Expense Abstract [Abstract]
Disclosure Of General And Administrative Expense Explanatory	32. General and Administrative Expenses 32.1 Details of general and administrative expenses for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Employee Benefits Salaries and short-term employee benefits—salaries ￦ 2,512,945 ￦ 2,557,821 ￦ 2,789,201 Salaries and short-term employee benefits—others 870,356 848,421 871,014 Post-employment benefits—defined benefit plans 217,085 231,913 235,231 Post-employment benefits—defined contribution plans 21,056 27,924 37,328 Termination benefits 242,010 239,790 361,098 Share-based payments 10,930 49,418 49,364 3,874,382 3,955,287 4,343,236 Depreciation and amortization 408,771 784,431 874,911 Other general and administrative expenses Rental expense 361,344 109,745 116,325 Tax and dues 214,683 238,670 260,071 Communication 46,661 48,749 53,596 Electricity and utilities 28,823 29,161 32,298 Publication 16,018 15,136 13,988 Repairs and maintenance 22,432 23,947 32,448 Vehicle 12,495 11,537 14,314 Travel 19,393 21,452 12,251 Training 30,310 31,451 27,610 Service fees 210,081 227,631 238,787 Electronic data processing expenses 189,007 258,456 280,773 Advertising 217,244 228,826 236,618 Others 266,868 286,538 295,926 1,635,359 1,531,299 1,615,005 ￦ 5,918,512 ￦ 6,271,017 ￦ 6,833,152 32.2 Share-based Payments 32.2.1 Stock grants The Group changed the scheme of share-based payments from stock options to stock grants in November 2007. The stock grants award program is an incentive plan that sets, on grant date, the maximum number of shares that can be awarded. Actual shares to be granted is determined in accordance with achievement of pre-set 32.2.1.1 Details of stock grants linked to long-term performance as of December 31, 2020, are as follows: Grant date Number of granted 1 Vesting conditions 2 (In number of shares) KB Financial Group Inc. Series 21 Jan. 01, 2019 25,172 Services fulfillment, market performance 3 non-market 4 Series 22 Apr. 01, 2019 3,226 Services fulfillment, market performance 3 non-market 4 Series 23 May 27, 2019 1,436 Services fulfillment, market performance 3 non-market 4 Series 24 Jul. 17, 2019 8,195 Services fulfillment, market performance 3 non-market 4 Series 25 Jan. 01, 2020 57,367 Services fulfillment, market performance 3 non-market 4 Series 26 Mar. 18, 2020 430 Services fulfillment, market performance 3 non-market 4 Series 27 Jun. 15, 2020 187 Services fulfillment, market performance 3 non-market 4 Series 28 Nov. 21, 2020 68,135 Services fulfillment, market performance 3 non-market 5 Deferred grant 2015 7,674 Satisfied 2016 8,705 Satisfied 2017 17,983 Satisfied 2018 5,960 Satisfied 2019 24,533 Satisfied 2020 28,134 Satisfied 257,137 Kookmin Bank Series 75 Jan. 01, 2019 154,996 Services fulfillment, market performance 3 non-market 4 Series 76 Apr. 01, 2019 5,380 Services fulfillment, market performance 3 non-market 4 Series 77 May 27, 2019 4,468 Services fulfillment, market performance 3 non-market 4 Series 78 Nov. 21, 2019 36,443 Services fulfillment, market performance 3 non-market 6 Series 79 Jan. 01, 2020 241,609 Services fulfillment, market performance 3 non-market 4 Series 80 Mar. 01, 2020 7,711 Services fulfillment, market performance 3 non-market 4 Deferred grant 2015 2,759 Satisfied 2016 19,109 Satisfied 2017 47,863 Satisfied 2018 65,514 Satisfied 2019 98,194 Satisfied 684,046 Other subsidiaries Stock granted in 2010 — 106 Services fulfillment, market performance 3 non-market 4 Stock granted in 2011 — 146 Stock granted in 2012 — 420 Stock granted in 2013 — 622 Stock granted in 2014 — 1,028 Stock granted in 2015 — 3,323 Stock granted in 2016 — 9,103 Stock granted in 2017 — 36,814 Stock granted in 2018 — 120,266 Stock granted in 2019 — 331,688 Stock granted in 2020 — 268,669 772,185 1,713,368 1 Granted shares represent the total number of shares initially granted to executives and employees who have residual shares as of December 31, 2020 (Deferred grants are residual shares vested as of December 31, 2020). 2 Executives and employees were given the option of deferred payment of the granted shares (after the date of retirement), payment ratio, and payment period. Accordingly, a certain percentage of the granted amount is deferred for up to five years after the date of retirement after the deferred grant has been confirmed. 3 Relative TSR (Total Shareholders Return): [(Fair value at the end of the contract—Fair value at the beginning of the contract) + (Total amount of dividend per share paid during the contract period)] / Fair value at the beginning of the contract 4 Companies’ and individuals’ performance results 5 EPS, Asset Quality, HCROI, Profit from non-banking 6 EPS, Asset Quality 32.2.1.2 Details of stock grants linked to short-term performance as of December 31, 2020, are as follows: Estimated number Vesting conditions (In number of shares) KB Financial Group Inc. Stock granted in 2015 7,524 Satisfied Stock granted in 2016 6,595 Satisfied Stock granted in 2017 7,385 Satisfied Stock granted in 2018 14,292 Satisfied Stock granted in 2019 28,030 Satisfied Stock granted in 2020 37,300 Proportional to service period Kookmin Bank Stock granted in 2015 9,887 Satisfied Stock granted in 2016 19,662 Satisfied Stock granted in 2017 30,003 Satisfied Stock granted in 2018 73,989 Satisfied Stock granted in 2019 125,530 Satisfied Stock granted in 2020 121,676 Proportional to service period Other subsidiaries Stock granted in 2015 12,191 Satisfied Stock granted in 2016 40,970 Satisfied Stock granted in 2017 149,329 Satisfied Stock granted in 2018 345,546 Satisfied Stock granted in 2019 551,667 Satisfied Stock granted in 2020 290,013 Proportional to service period 1,871,589 * Executives and employees were given the option of deferred payment of the granted shares (after the date of retirement), payment ratio, and payment period. Accordingly, a certain percentage of the granted amount is deferred for up to five years after the date of retirement after the deferred grant has been confirmed. 32.2.1.3 Stock grants are measured at fair value using the MonteCarlo Simulation Model and assumptions used in determining the fair value as of December 31, 2020, are as follows: Risk-free Fair value (market Fair value (non-market performance (in Korean won) Linked to long-term performance ( KB Financial Group Inc. Series 21 0.74 38,789~45,096 38,789~45,096 Series 22 0.74 37,324~41,899 37,324~41,899 Series 23 0.74 37,324~41,899 37,324~41,899 Series 24 0.74 38,789~45,096 38,789~45,096 Series 25 0.74 37,324~45,096 37,324~45,096 Series 26 0.74 38,789~45,096 38,789~45,096 Series 27 0.74 38,789~45,096 38,789~45,096 Series 28 0.74 30,871~34,675 34,694~38,969 Deferred grant in 2015 0.74 — 35,895~45,096 Deferred grant in 2016 0.74 — 38,789~45,096 Deferred grant in 2017 0.74 — 40,299~45,096 Deferred grant in 2018 0.74 — 38,789~45,096 Deferred grant in 2019 0.74 — 40,299~47,631 Deferred grant in 2020 0.74 — 38,969~42,065 ( Kookmin Bank Series 75 0.74 38,789~45,096 38,789~45,096 Series 76 0.74 37,324~41,899 37,324~41,899 Series 77 0.74 37,324~41,899 37,324~41,899 Series 78 0.74 36,370~40,828 37,324~41,899 Series 79 0.74 37,324~45,096 37,324~45,096 Series 80 0.74 35,895~40,299 35,895~40,299 Grant deferred in 2015 0.74 — 41,899~45,096 Grant deferred in 2016 0.74 — 38,789~45,096 Grant deferred in 2017 0.74 — 38,789~45,096 Grant deferred in 2018 0.74 — 38,789~45,096 Grant deferred in 2019 0.74 — 40,299~45,096 ( Other subsidiaries Stock granted in 2010 0.74 — 40,299~40,299 Stock granted in 2011 0.74 — 40,299~40,299 Stock granted in 2012 0.74 — 40,299~41,899 Stock granted in 2013 0.74 — 35,692~41,899 Stock granted in 2014 0.74 — 41,899~41,899 Stock granted in 2015 0.74 — 34,581~47,631 Stock granted in 2016 0.74 — 37,324~56,293 Stock granted in 2017 0.74 — 34,581~61,294 Stock granted in 2018 0.74 33,612~44,072 35,895~47,631 Stock granted in 2019 0.74 37,324~45,096 34,581~47,631 Stock granted in 2020 0.74 35,780~45,096 35,895~45,096 Risk-free Fair value (Market Fair value (Non-market performance (in Korean won) Linked to short-term performance ( KB Financial Group Inc. Stock granted in 2015 0.74 — 35,895~45,096 Stock granted in 2016 0.74 — 34,581~45,096 Stock granted in 2017 0.74 — 38,789~45,096 Stock granted in 2018 0.74 — 38,789~47,631 Stock granted in 2019 0.74 — 40,299~45,096 Stock granted in 2020 0.74 — 38,789~42,065 (Kookmin Bank) Stock granted in 2015 0.74 — 38,789~47,153 Stock granted in 2016 0.74 — 37,324~61,294 Stock granted in 2017 0.74 — 38,789~47,631 Stock granted in 2018 0.74 — 38,789~47,631 Stock granted in 2019 0.74 — 40,299~45,096 Stock granted in 2020 0.74 — 38,789~41,899 (Other subsidiaries) Stock granted in 2015 0.74 — 34,581~45,096 Stock granted in 2016 0.74 — 34,581~47,631 Stock granted in 2017 0.74 — 34,581~47,631 Stock granted in 2018 0.74 — 34,581~47,631 Stock granted in 2019 0.74 — 34,581~45,096 Stock granted in 2020 0.74 — 35,895~43,147 The Group used the volatility of the stock price over the previous year as the expected volatility, and used the arithmetic mean of the dividend rate of one year before, two years before, and three years before the base year as the dividend rate, and used one-year 32.2.1.4 The accrued expenses for share-based payments related to stocks grants as of December 31, 2019 and 2020, are ￦ 124,853 million and ￦ 135,327 million, respectively, and compensation costs from stock grants amounting to ￦ 49,418 million and ￦ 48,712 million were recognized for the years ended December 31, 2019 and 2020, respectively. 32.2.2 Mileage stock 32.2.2.1 Details of mileage stock as of December 31, 2020, are as follows: Grant date Number of Expected exercise 2 Remaining (In number of shares) Stock granted in 2018 Jan. 10, 2018 19,197 0.00~0.02 13,522 Feb. 12, 2018 9 0.00~0.12 3 Apr. 02, 2018 115 0.00~0.25 82 Apr. 30, 2018 86 0.00~0.33 49 May 08, 2018 170 0.00~0.35 140 Jun. 01, 2018 140 0.00~0.41 106 Jul. 02, 2018 180 0.00~0.50 123 Aug. 07, 2018 194 0.00~0.60 149 Aug. 09, 2018 47 0.00~0.60 31 Aug. 14, 2018 30 0.00~0.62 26 Aug. 16, 2018 130 0.00~0.62 93 Sep. 07, 2018 106 0.00~0.68 77 Oct. 04, 2018 129 0.00~0.76 78 Nov. 01, 2018 258 0.00~0.83 200 Nov. 06, 2018 236 0.00~0.85 168 Dec. 03, 2018 132 0.00~0.92 127 Dec. 04, 2018 21 0.00~0.92 21 Dec. 07, 2018 91 0.00~0.93 78 Dec. 12, 2018 64 0.00~0.95 32 Dec. 18, 2018 271 0.00~0.96 237 Dec. 19, 2018 42 0.00~0.96 34 Dec. 31, 2018 127 0.00~1.00 106 Stock granted in 2019 Jan. 11, 2019 26,580 0.00~1.03 21,231 Feb. 01, 2019 12 0.00~1.08 8 Apr. 01, 2019 167 0.00~1.25 96 Apr. 18, 2019 105 0.00~1.29 81 Apr. 22, 2019 33 0.00~1.30 33 Jul. 01, 2019 109 0.00~1.50 87 Aug. 29, 2019 39 0.00~1.66 39 Sep. 02, 2019 50 0.00~1.67 50 Nov. 01, 2019 119 0.00~1.83 95 Nov. 08, 2019 14 0.00~1.85 14 Dec. 05, 2019 56 0.00~1.93 54 Dec. 06, 2019 84 0.00~1.93 84 Dec. 31, 2019 87 0.00~2.00 87 Stock granted in 2020 Jan. 18, 2020 28,645 0.00~2.05 27,672 May 12, 2020 46 0.00~2.36 46 Jun. 30, 2020 206 0.00~2.50 206 Aug. 26, 2020 40 0.00~2.65 40 Oct. 29, 2020 160 0.00~2.83 160 Nov. 6, 2020 45 0.00~2.85 45 Nov. 30, 2020 35 0.00~2.92 35 Dec. 2, 2020 57 0.00~2.92 57 Dec. 4, 2020 154 0.00~2.93 154 Dec. 30, 2020 88 0.00~3.00 88 78,706 65,944 1 Mileage stock is exercisable for two years after one year from the grant date. When the mileage stock is exercised, the closing price of prior month is applied. However, in case of transfer or retirement during the vesting period, mileage stock is exercisable at the closing price of the last month prior to transfer or retirement. 2 The shares are assessed based on the stock price as of December 31, 2020. These shares are vested immediately at grant date. 32.2.2.2 The accrued expenses for share-based payments related to mileage stock as of December 31, 2019 and 2020, are ￦ 2,705 million and ￦ 2,862 million, respectively. The compensation costs amounting to ￦ 1,334 million and ￦ 1,086 million were recognized as expenses for the years ended December 31, 2019 and 2020, respectively. 32.2.3 Long-term share-based payments The Group calculates the short-term performance bonus of directors of Prudential Life Insurance Company of Korea Ltd. based on the results of the current performance evaluation and will defer the bonus for three years and pay it in cash reflecting the stock price of KB Financial Group at that time. 32.2.3.1 Details of long-term share-based payments as of December 31, 2020, are as follows: Grant date Vested shares Expected exercise period (years) Vesting condition Granted in 2020 2020 16,800 3.00 Services fulfillment 32.2.3.2 long-term share-based payments are measured at fair value using the MonteCarlo Simulation Model and assumptions used in determining the fair value as of December 31, 2020, are as follows: Risk-free rate (%) Fair value (Market performance condition) Fair value (Non-market (in Korean won) Granted in 2020 0.741 — 38,789 The Group used the volatility of the stock price over the previous year as the expected volatility, and used the arithmetic mean of the dividend rate of one year before, two years before, and three years before the base year as the dividend rate, and used one-year 32.2.3.3 The accrued expenses for long-term share-based payments as of December 31, 2020 are ￦ 652 million. The compensation costs amounting to ￦ 652 million were recognized as expenses for the year ended December 31, 2020.

Non-operating Income And Expens

Non-operating Income And Expenses	12 Months Ended
	Dec. 31, 2020
Non Operating Income And Expenses [Abstract]
Other Nonoperating Income And Expense Text Block	33. Non-Operating Details of non-operating 2018 2019 2020 (In millions of Korean won) Non-operating Gains on disposal of property and equipment ￦ 34,238 ￦ 35,747 ￦ 111,132 Rental income 55,321 85,720 113,075 Gain on a bargain purchase — — 145,067 Gain on sales of disposal group held for sale 118,716 2,731 — Others 37,122 84,793 96,931 245,397 208,991 466,205 Non-operating Losses on disposal of property and equipment 6,131 8,587 11,945 Donation 130,249 102,711 113,083 Restoration costs 4,386 2,902 5,043 Management cost for written-off 3,338 3,382 3,018 Others 91,502 64,523 143,726 235,606 182,105 276,815 Net non-operating ￦ 9,791 ￦ 26,886 ￦ 189,390

Income Tax Expense

Income Tax Expense	12 Months Ended
	Dec. 31, 2020
Major Components Of Tax Expense Income Abstract [Abstract]
Disclosure Of Income Tax Explanatory	34. Income Tax Expense 34.1 Details of income tax expense for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Tax payable Current tax expense ￦ 1,096,600 ￦ 1,043,047 ￦ 1,099,171 Adjustments of tax of prior years recognized in current tax 22,925 (51,130 ) (13,434 ) 1,119,525 991,917 1,085,737 Changes in deferred income tax assets (liabilities)* 114,345 285,820 323,032 Income tax recognized directly in equity and others Remeasurements of net defined benefit liabilities 52,377 21,172 3,792 Exchange differences on translating foreign operations (13,087 ) (5,714 ) 14,988 Net gains or losses on financial instruments at fair value through other comprehensive income (33,329 ) (13,168 ) (88,907 ) Shares of other comprehensive income or loss of associates and joint ventures 1,374 (3,147 ) 2,976 Gains or losses on cash flow hedging instruments 400 10,537 7,580 Gains or losses on hedging instruments of net investments in foreign operations 10,292 3,194 (24,500 ) Other comprehensive income or loss arising from separate account (10,864 ) (1,301 ) 3,671 Fair value changes on financial liabilities designated at fair value due to own credit risk (563 ) 4,294 (3,350 ) Net gains or losses on overlay approach adjustment (884 ) (72,817 ) (61,637 ) Consideration for exchangeable rights — — (4,526 ) 5,716 (56,950 ) (149,913 ) Others — — 495 Income tax expense ￦ 1,239,586 ￦ 1,220,787 ￦ 1,259,351 * Effect of business combination is excluded. 34.2 Analysis of the net profit before income tax and income tax expense for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 Tax rate Amount Tax rate Amount Tax rate Amount (In millions of Korean won) Profit before tax ￦ 4,301,532 ￦ 4,533,986 ￦ 4,761,632 Tax at the applicable tax rate* 27.26 1,172,559 27.27 1,236,484 27.28 1,299,087 Non-taxable (0.28 ) (11,888 ) (0.52 ) (23,601 ) (1.55 ) (73,855 ) Non-deductible 0.64 27,551 0.42 19,086 0.35 16,541 Tax credit and tax exemption (0.01 ) (637 ) (0.01 ) (627 ) (0.08 ) (4,016 ) Temporary difference for which no deferred tax is recognized 0.29 12,260 (0.11 ) (4,860 ) 0.47 22,189 Changes in recognition and measurement of deferred tax (0.06 ) (2,692 ) — (100 ) 0.24 11,616 Income tax refund for tax of prior years (0.19 ) (8,135 ) (0.20 ) (9,105 ) (0.46 ) (22,139 ) Income tax expense of overseas branch 0.09 3,882 0.11 5,004 0.23 10,739 Effects from change in tax rate (0.03 ) (1,470 ) — — — — Others 1.12 48,156 (0.03 ) (1,494 ) (0.02 ) (811 ) Average effective tax rate and tax expense 28.82 ￦ 1,239,586 26.93 ￦ 1,220,787 26.45 ￦ 1,259,351 * Applicable income tax rate for ￦ 200 million and below is 11%, for over ￦ 200 million to ￦ 20 billion is 22%, for over ￦ 20 billion to ￦ 300 billion is 24.2% and for over ￦ 300 billion is 27.5% for the years ended December 31, 2018, 2019 and 2020.

Dividends

Dividends	12 Months Ended
	Dec. 31, 2020
Dividends Abstract [Abstract]
Disclosure Of Dividends Explanatory	35. Dividends The dividends paid to the shareholders of the Parent Company in 2019 and 2020 were ￦ 759,736 million (￦ 1,920 per share) and ￦ 861,092 million (￦ 2,210 per share), respectively. The dividend to the shareholders for the year ended December 31, 2020, amounting to ￦ 689,653 million (￦ 1,770 per share) is to be proposed at the annual general meeting on March 26, 2021. The Group’s consolidated financial statements as of December 31, 2020, do not reflect this dividend payable.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Analysis Of Other Comprehensive Income By Item Abstract [Abstract]
Disclosure Of Analysis Of Other Comprehensive Income By Item Explanatory	36. Accumulated Other Comprehensive Income (Loss) Changes in accumulated other comprehensive income (loss) for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Changes except for Reclassification Transfer Tax effect Ending (In millions of Korean won) Remeasurements of net defined benefit liabilities ￦ (234,401 ) ￦ (76,999 ) ￦ — ￦ — ￦ 21,172 ￦ (290,228 ) Exchange differences on translating foreign operations (5,784 ) 37,938 5,353 — (5,714 ) 31,793 Net gains on financial instruments at fair value through other comprehensive income 450,694 106,984 (82,662 ) 25,483 (13,168 ) 487,331 Share of other comprehensive income (loss) of associates and joint ventures (4,377 ) 10,842 — — (3,147 ) 3,318 Gains (losses) on cash flow hedging instruments 5,849 (65,323 ) 21,604 — 10,537 (27,333 ) Losses on hedging instruments of net investments in foreign operations (33,092 ) (13,410 ) 1,316 — 3,194 (41,992 ) Other comprehensive income arising from separate account 15,017 21,029 (16,364 ) — (1,301 ) 18,381 Fair value changes on financial liabilities designated at fair value due to own credit risk (8,954 ) (15,666 ) — — 4,294 (20,326 ) Net gains (losses) on overlay approach adjustment (7,146 ) 269,643 (2,603 ) — (72,817 ) 187,077 ￦ 177,806 ￦ 275,038 ￦ (73,356 ) ￦ 25,483 ￦ (56,950 ) ￦ 348,021 2020 Beginning Changes except for Reclassification Transfer to Tax effect Ending (In millions of Korean won) Remeasurements of net defined benefit liabilities ￦ (290,228 ) ￦ (13,888 ) ￦ — ￦ — ￦ 3,792 ￦ (300,324 ) Exchange differences on translating foreign operations 31,793 (177,894 ) — — 14,988 (131,113 ) Net gains on financial instruments at fair value through other comprehensive income 487,331 757,236 (112,020 ) (326,410 ) (88,907 ) 717,230 Share of other comprehensive income (loss) of associates and joint ventures 3,318 (3,923 ) (5,900 ) — 2,976 (3,529 ) Losses on cash flow hedging instruments (27,333 ) (48,034 ) 39,190 — 7,580 (28,597 ) Gains (losses) on hedging instruments of net investments in foreign operations (41,992 ) 88,769 — — (24,500 ) 22,277 Other comprehensive income arising from separate account 18,381 2,834 (16,188 ) — 3,671 8,698 Fair value changes on financial liabilities designated at fair value due to own credit risk (20,326 ) 12,169 — — (3,350 ) (11,507 ) Net gains on overlay approach adjustment 187,077 248,688 (34,926 ) — (61,637 ) 339,202 ￦ 348,021 ￦ 865,957 ￦ (129,844 ) ￦ (326,410 ) ￦ (145,387 ) ￦ 612,337

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2020
Earnings Per Share Abstract [Abstract]
Disclosure Of Earnings Per Share Explanatory	37. Earnings per Share 37.1 Basic Earnings per Share Basic earnings per share is calculated by dividing profit attributable to shareholders of the Parent Company by the weighted average number of ordinary shares outstanding. 37.1.1 Weighted average number of ordinary shares outstanding Details of weighted average number of ordinary shares outstanding for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (in number of shares) Number of Shares Accumulated Number of Shares Accumulated Number of shares Accumulated Number of issued ordinary shares 418,111,537 152,610,711,005 415,807,920 152,564,638,665 415,807,920 152,185,698,720 Number of treasury shares (22,560,240 ) (7,888,226,378 ) (26,173,585 ) (9,801,574,522 ) (26,173,585 ) (9,579,532,110 ) Average number of ordinary shares outstanding 395,551,297 144,722,484,627 389,634,335 142,763,064,143 389,634,335 142,606,166,610 Number of days 365 365 366 Weighted average number of ordinary shares outstanding 396,499,958 391,131,683 389,634,335 37.1.2 Basic earnings per share Details of basic earnings per share for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In Korean won and in number of shares) Profit attributable to shareholders of the Parent Company ￦ 3,061,191,387,929 ￦ 3,311,827,412,557 ￦ 3,455,151,501,224 Deduction: Dividends on hybrid securities — 6,512,500,000 22,859,500,000 Profit attributable to the ordinary equity holders of the Parent Company (A) 3,061,191,387,929 3,305,314,912,557 3,432,292,001,224 Weighted average number of ordinary shares outstanding (B) 396,499,958 391,131,683 389,634,335 Basic earnings per share (A/B) ￦ 7,721 ￦ 8,451 ￦ 8,809 37.2 Diluted Earnings per Share Diluted earnings per share is calculated through increasing the weighted average number of ordinary shares outstanding by the weighted average number of additional ordinary shares that would have been outstanding assuming the conversion of all dilutive potential ordinary shares. The Group has categories of dilutive potential ordinary shares such as stock grants and ordinary share exchange rights of exchangeable bonds. A calculation is done to determine the number of shares that could have been acquired at fair value (determined as the average market share price for the year) based on the monetary value of stock grants. The number of shares calculated above is compared with the number of shares that would have been issued assuming the settlement of stock grants. In addition, exchangeable bonds issued for the year ended December 31, 2020, were included in potential ordinary shares from the exercisable date of the exchange right, and interest expenses after tax for the period were added to profit for diluted earnings per share. 37.2.1 Adjusted profit for diluted earnings per share Adjusted profit for diluted earnings per share for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In Korean won) Profit attributable to shareholders of the Parent Company ￦ 3,061,191,387,929 ￦ 3,311,827,412,557 ￦ 3,455,151,501,224 Deduction: Dividends on hybrid securities — 6,512,500,000 22,859,500,000 Profit attributable to ordinary equity holders of the Parent Company 3,061,191,387,929 3,305,314,912,557 3,432,292,001,224 Adjustments: Interest expense on exchangeable bonds — — 798,012,332 Adjusted profit for diluted earnings per share ￦ 3,061,191,387,929 ￦ 3,305,314,912,557 ￦ 3,433,090,013,556 37.2.2 Weighted average number of ordinary shares outstanding for diluted earnings per share Adjusted weighted average number of ordinary shares outstanding for diluted earnings per share for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In number of shares) Weighted average number of ordinary shares outstanding 396,499,958 391,131,683 389,634,335 Adjustment: Stock grants 2,307,630 2,890,513 3,416,737 Exchangeable bonds — — 1,707,650 Adjusted weighted average number of ordinary shares outstanding for diluted earnings per share 398,807,588 394,022,196 394,758,722 37.2.3 Diluted earnings per share Details of diluted earnings per share for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In Korean won and in number of shares) Adjusted profit for diluted earnings per share ￦ 3,061,191,387,929 ￦ 3,305,314,912,557 ￦ 3,433,090,013,556 Adjusted weighted average number of ordinary shares outstanding for diluted earnings per share 398,807,588 394,022,196 394,758,722 Diluted earnings per share ￦ 7,676 ￦ 8,389 ￦ 8,697

Insurance Contracts

Insurance Contracts	12 Months Ended
	Dec. 31, 2020
Disclosure Of Types Of Insurance Contracts Abstract [Abstract]
Disclosure Of Insurance Contracts Explanatory	38. Insurance Contracts 38.1 Insurance Assets 38.1.1 Details of deferred acquisition costs included in other assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Non-life ￦ 786,626 ￦ 965,683 Life insurance 134,739 205,289 ￦ 921,365 ￦ 1,170,972 38.1.2 Changes in deferred acquisition costs included in other assets for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Increase Amortization Ending (In millions of Korean won) Non-life ￦ 547,831 ￦ 815,712 ￦ (576,917 ) ￦ 786,626 Life insurance 119,293 117,808 (102,362 ) 134,739 ￦ 667,124 ￦ 933,520 ￦ (679,279 ) ￦ 921,365 2020 Beginning Increase Amortization Ending (In millions of Korean won) Non-life ￦ 786,626 ￦ 872,811 ￦ (693,754 ) ￦ 965,683 Life insurance 134,739 144,429 (73,879 ) 205,289 ￦ 921,365 ￦ 1,017,240 ￦ (767,633 ) ￦ 1,170,972 38.1.3 Details of reinsurance assets included in other assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Non-life Reserve for outstanding claims General insurance ￦ 361,065 ￦ 732,579 Automobile insurance 16,555 14,916 Long-term insurance 130,758 156,234 Unearned premium reserve General insurance 208,820 285,634 Automobile insurance 19,952 10,870 737,150 1,200,233 Life insurance Reserve for outstanding claims 1,639 2,081 Unearned premium reserve 408 951 2,047 3,032 Others Reserve for outstanding claims 2,563 2,427 Unearned premium reserve 844 895 3,407 3,322 Total reinsurance assets 742,604 1,206,587 Allowances for impairment 1,953 879 Total reinsurance assets, net ￦ 740,651 ￦ 1,205,708 38.1.4 Changes in reinsurance assets included in other assets for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Net increase Ending (In millions of Korean won) Non-life Reserve for outstanding claims General insurance ￦ 360,997 ￦ 68 ￦ 361,065 Automobile insurance 18,057 (1,502 ) 16,555 Long-term insurance 109,751 21,007 130,758 Unearned premium reserve General insurance 171,240 37,580 208,820 Automobile insurance 30,864 (10,912 ) 19,952 690,909 46,241 737,150 Life insurance Reserve for outstanding claims 1,912 (273 ) 1,639 Unearned premium reserve 448 (40 ) 408 2,360 (313 ) 2,047 Others Reserve for outstanding claims 3,417 (854 ) 2,563 Unearned premium reserve 983 (139 ) 844 4,400 (993 ) 3,407 Total reinsurance assets 697,669 44,935 742,604 Allowance for impairment 1,916 37 1,953 Total reinsurance assets, net ￦ 695,753 ￦ 44,898 ￦ 740,651 2020 Beginning Net increase Business combination Ending (In millions of Korean won) Non-life Reserve for outstanding claims General insurance ￦ 361,065 ￦ 371,514 ￦ — ￦ 732,579 Automobile insurance 16,555 (1,639 ) — 14,916 Long-term insurance 130,758 25,476 — 156,234 Unearned premium reserve General insurance 208,820 76,814 — 285,634 Automobile insurance 19,952 (9,082 ) — 10,870 737,150 463,083 — 1,200,233 Life insurance Reserve for outstanding claims 1,639 (564 ) 1,006 2,081 Unearned premium reserve 408 (27 ) 570 951 2,047 (591 ) 1,576 3,032 Others Reserve for outstanding claims 2,563 (136 ) — 2,427 Unearned premium reserve 844 51 — 895 3,407 (85 ) — 3,322 Total reinsurance assets 742,604 462,407 1,576 1,206,587 Allowances for impairment 1,953 (1,074 ) — 879 Total reinsurance assets, net ￦ 740,651 ￦ 463,481 ￦ 1,576 ￦ 1,205,708 38.2 Insurance Liabilities 38.2.1 Details of insurance liabilities by insurance types as of December 31, 2019 and 2020, are as follows: December 31, 2019 Non-life insurance Life insurance Others Total (In millions of Korean won) Premium reserve ￦ 23,799,607 ￦ 6,991,247 ￦ — ￦ 30,790,854 Reserve for outstanding claims 2,297,256 101,690 2,563 2,401,509 Unearned premium reserve 1,522,827 4,603 845 1,528,275 Reserve for dividend to policyholders 117,094 29,745 — 146,839 Reserve for distribution of earnings to policyholders 46,901 4,202 — 51,103 Reserve for loss compensation on participating insurance 20,090 5,784 — 25,874 Guarantee reserve — 22,229 — 22,229 ￦ 27,803,775 ￦ 7,159,500 ￦ 3,408 ￦ 34,966,683 December 31, 2020 Non-life insurance Life insurance Others Total (In millions of Korean won) Premium reserve* ￦ 24,990,530 ￦ 23,264,955 ￦ — ￦ 48,255,485 Reserve for outstanding claims 2,885,006 252,883 2,426 3,140,315 Unearned premium reserve 1,859,367 9,450 896 1,869,713 Reserve for dividend to policyholders 129,660 41,024 — 170,684 Reserve for distribution of earnings to policyholders 51,292 5,009 — 56,301 Reserve for loss compensation on participating insurance 20,090 6,818 — 26,908 Guarantee reserve — 895,890 — 895,890 ￦ 29,935,945 ￦ 24,476,029 ￦ 3,322 ￦ 54,415,296 * Negative VOBA amounting to ￦ 2,698,010 million is included. 38.2.2 Changes in insurance liabilities for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Net increase 1 Ending (In millions of Korean won) Non-life General insurance ￦ 1,054,823 ￦ 10,090 ￦ 1,064,913 Automobile insurance 1,492,294 131,552 1,623,846 Long-term insurance 23,386,279 1,619,799 25,006,078 Long-term investment contract 110,256 (1,318 ) 108,938 Life insurance Pure endowment insurance 5,233,491 2,637 5,236,128 Death insurance 500,571 142,392 642,963 Endowment insurance 1,621,460 (350,605 ) 1,270,855 Group insurance 735 (211 ) 524 Others 2 8,640 391 9,031 Others 4,400 (993 ) 3,407 ￦ 33,412,949 ￦ 1,553,734 ￦ 34,966,683 2020 Beginning Net increase 1 Business combination Ending (In millions of Korean won) Non-life insurance General insurance ￦ 1,064,913 ￦ 503,828 ￦ — ￦ 1,568,741 Automobile insurance 1,623,846 274,026 — 1,897,872 Long-term insurance 25,006,078 1,356,401 — 26,362,479 Long-term investment contract 108,938 (2,085 ) — 106,853 Life insurance Pure endowment insurance 5,236,128 318,109 2,016,112 7,570,349 Death insurance 642,963 404,456 14,658,632 15,706,051 Endowment insurance 1,270,855 (156,688 ) 74,132 1,188,299 Group insurance 524 (1,021 ) — (497 ) Others 2 9,031 (1,217 ) 4,013 11,827 Others 3,407 (85 ) — 3,322 ￦ 34,966,683 ￦ 2,695,724 ￦ 16,752,889 ￦ 54,415,296 1 Includes exchange differences effect and decrease in liabilities related to investment contract. 2 Includes reserve for distribution of earnings to policyholders and Reserve for loss compensation on participating insurance. 38.3 Liability Adequacy Test According to the revision of the Regulations on Supervision of Insurance Business, the criteria for the insurance liability adequacy test were changed, and the Group accounted for the change as a change in accounting policy because it provided reliable and more relevant information about current estimates of future cash flows. This change in accounting policy has no effect on the consolidated financial statements, but comparative notes have been restated. 38.3.1 KB Insurance Co., Ltd. Assumptions and basis for the insurance liability adequacy test of KB Insurance Co., Ltd. as of December 31, 2019 and 2020, are as follows: Assumptions (%) Calculation basis December 31, December 31, 2020 Long-term insurance Discount rate 1.53~8.34 0.83~15.42 Calculated by applying interest rate scenario which is risk-free rate scenario adjusted by liquidity premium. This is presented by the Financial Supervisory Service Expense ratio 6.60 6.46 Calculated using future expense plan based on the most recent one-year Lapse ratio 1.51~34.13 1.48~35.44 Calculated based on the recent five-year experience statistics Risk ratio 13.1~1,037.3 11.9~1,055.2 Calculated by ratio of insurance claim payments to risk premiums based on the recent seven-year experience statistics General insurance Expense ratio 11.38 10.74 Ratio of maintenance costs incurred to earned premiums by the types of contracts for the most recent one year Claim survey cost ratio 4.54 4.70 Ratio of claim survey cost to insurance claim payments by the type of contracts for the most recent three years Loss ratio 64.95 70.74 Ratio of final loss incurred to earned premiums by the type of contracts for the most recent five years Automobile insurance Expense ratio 9.94 9.00 Ratio of maintenance costs incurred to earned premiums by the types of collaterals for the most recent one year Claim survey cost ratio 8.84 8.40 Ratio of claim survey cost to insurance claim payments by the type of collaterals for the most recent three years Loss ratio 78.44 78.20 Ratio of final loss incurred to earned premiums by the type of collaterals for the most recent five years Results of the insurance liability adequacy test of KB Insurance Co., Ltd. as of December 31, 2019 and 2020, are as follows: December 31, 2019 Recognized liabilities* Estimated adequate Shortfall (surplus) (In millions of Korean won) General insurance ￦ 365,234 ￦ 296,801 ￦ (68,433 ) Automobile insurance 1,123,450 1,071,076 (52,374 ) Long-term insurance 19,775,907 10,685,319 (9,090,588 ) ￦ 21,264,591 ￦ 12,053,196 ￦ (9,211,395 ) December 31, 2020 Recognized liabilities* Estimated adequate Shortfall (surplus) (In millions of Korean won) General insurance ￦ 461,227 ￦ 384,780 ￦ (76,447 ) Automobile insurance 1,363,104 1,279,587 (83,517 ) Long-term insurance 20,892,077 11,982,350 (8,909,727 ) ￦ 22,716,408 ￦ 13,646,717 ￦ (9,069,691 ) * Long-term insurance is for premium reserves and unearned premium reserves; the premium reserve is the amount of subtracting deferred acquisition costs and insurance contract loans from the net insurance premium reserve in accordance with Article 6-3 As a result of liability adequacy test, the Group did not set additional reserve as it shows net surplus. As such, there was no amount recorded as a result of liability adequacy test. 38.3.2 KB Life Insurance Co., Ltd. Assumptions and basis for the insurance liability adequacy test of KB Life Insurance Co., Ltd. as of December 31, 2019 and 2020, are as follows: Assumptions (%) December 31, 2019 December 31, 2020 Calculation basis Lapse ratio 0~65.39 0~65.50 Ratio of canceled premiums to premiums by product group, method of payment, channel, and elapsed period, based on the most recent five-year experience statistics Loss ratio 11~132 24~156 Ratio of number of accidents to the number of holding insurances, by collateral, gender and elapsed period, based on the most recent seven-year experience statistics Discount rate 1.04~5.79 0.98~15.33 Estimated investment yield based on the interest rate scenario provided by the Financial Supervisory Service adjusted by risk spread Indirect costs included in administration expenses were calculated based on unit cost of the expense allocation standards of the last year in accordance with the Detailed Regulations on Supervision of Insurance Business. Direct costs included in administration expenses were calculated based on estimates of future expense according to the Group’s internal regulations. The insurance liability adequacy test of KB Life Insurance Co., Ltd. is performed by contract types such as interest rate types and dividend types. Results of life insurance liability adequacy test as of December 31, 2019 and 2020, are as follows: December 31, 2019 Recognized liabilities Estimated adequate Shortfall (surplus) (In millions of Korean won) Fixed interest type Participating ￦ 30,514 ￦ 56,460 ￦ 25,946 Non-participating 180,058 45,166 (134,892 ) Variable interest type Participating 1,037,148 1,080,830 43,682 Non-participating 5,335,572 5,069,047 (266,525 ) Variable type (23,514 ) (133,781 ) (110,267 ) Total ￦ 6,559,778 ￦ 6,117,722 ￦ (442,056 ) December 31, 2020 Recognized liabilities Estimated adequate Shortfall (surplus) (In millions of Korean won) Fixed interest type Participating ￦ 30,447 ￦ 56,125 ￦ 25,678 Non-participating 395,766 12,952 (382,814 ) Variable interest type Participating 970,376 991,663 21,287 Non-participating 5,508,172 5,141,265 (366,907 ) Variable type (26,685 ) (124,623 ) (97,938 ) Total ￦ 6,878,076 ￦ 6,077,382 ￦ (800,694 ) As a result of liability adequacy test, the Group did not set additional reserve as it shows net surplus. As such, there was no amount recorded as a result of liability adequacy test. 38.3.3 Prudential Life Insurance Company of Korea Ltd. Assumptions and basis for the insurance liability adequacy test of Prudential Life Insurance Company of Korea Ltd. as of December 31, 2020, are as follows: Assumptions Calculation basis Lapse ratio 2~28 Ratio of canceled premiums to premiums by product group and elapsed period, based on the most recent five-year experience statistics Loss ratio 21~312 Calculated by ratio of insurance claim payments to risk premiums based on the recent five-year experience statistics Discount rate 0.85~16.27 Estimated investment yield based on the interest rate scenario provided by the Financial Supervisory Service adjusted by risk spread The insurance liability adequacy test of Prudential Life Insurance Company of Korea Ltd. is performed by contract types such as interest rate types and dividend types. Results of life insurance liability adequacy test as of December 31, 2020, are as follows: December 31, 2020 Recognized liabilities Estimated adequate Shortfall (surplus) (In millions of Korean won) Fixed interest type Participating ￦ 75,390 ￦ 83,404 ￦ 8,014 Non-participating 11,037,531 10,534,663 (502,868 ) Variable interest type Participating — — — Non-participating 721,570 547,754 (173,816 ) Variable type 369,991 (1,220,080 ) (1,590,071 ) Total ￦ 12,204,482 ￦ 9,945,741 ￦ (2,258,741 ) As a result of liability adequacy test, the Group did not set additional reserve as it shows net surplus. As such, there was no amount recorded as a result of liability adequacy test. 38.4 Net Insurance Income Details of insurance income and expenses for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Insurance Income Premium income ￦ 10,730,227 ￦ 11,173,367 ￦ 12,872,727 Reinsurance income 873,053 850,871 823,500 Reversal of policy reserves 344 993 85 Separate account income 360,664 216,429 216,485 Income from change in reinsurance assets — 42,432 467,729 Other insurance income 10,782 33,090 6,114 11,975,070 12,317,182 14,386,640 Insurance Expenses Insurance claims paid 4,415,760 5,046,772 5,264,829 Dividend expenses 9,400 9,902 11,661 Refunds of surrender value 2,855,573 2,870,543 3,286,150 Reinsurance expenses 947,560 1,018,007 1,127,304 Provision for policy reserves 1,608,519 1,547,264 2,709,903 Separate account expenses 276,412 139,810 113,703 Administration expenses 418,646 453,016 563,085 Amortization of deferred acquisition costs 606,073 679,279 767,633 Expenses from change in reinsurance assets 89,621 314 163 Claim survey expenses paid 38,782 52,123 58,873 Other insurance expenses 218,608 200,640 183,343 11,484,954 12,017,670 14,086,647 Net insurance income ￦ 490,116 ￦ 299,512 ￦ 299,993 38.5 Risk Management of KB Insurance Co., Ltd. 38.5.1 Overview Insurance risk is the risk that arises from a primary operation of insurance companies that is associated with acceptance of insurance contract and payment of claims and is classified as the insurance price risk and the reserves risk. The insurance price risk is the risk of loss that might occur when the actual risk exceeds the expected risk ratio or expected expense ratio in calculation of premiums. It is the risk of loss that arises from differences between actual payment of claims and premiums received from policyholders. The reserves risk is the risk that arises due to a deficit in reserves at the date of assessment, making the Group unable to cover the actual claims payment in the future. 38.5.2 Purposes, policies and procedures to manage risk arising from insurance contracts The risks associated with insurance contract that the Group faces are the insurance actuarial risk and the acceptance risk. Each risk occurs due to insurance contract’s pricing and conditions of acceptance. In order to minimize acceptance risk, the Group establishes guidelines and procedure for acceptance and outlines specific conditions for acceptance by product. In addition, expected risk level at the date of pricing is compared with actual risk of contracts after acceptance and various subsequent measures such as the adjustments in the interest rate and sales conditions, termination of selling specific product and others are taken in order to reduce insurance actuarial risk. The Group has a committee to discuss status of product acceptance risk and interest rate policy. The committee decides important matters to set the processes that allow minimizing the insurance actuarial risk, the acceptance risk and other business-related risk. In addition, according to reinsurance operating standards, the Group establishes an operating strategy of reinsurance for large claims expense due to unexpected catastrophic events. The Group aims at policy holders’ safety and its stable profit achievement. For the long-term goal, the Group manages risk at a comprehensive level to keep its value at the maximum. 38.5.3 Exposure to insurance price risk According to RBC standard, exposure to insurance price risk is defined as net written premiums for prior one year that is calculated by adding and subtracting direct insurance premium, assumed reinsurance premium and ceded reinsurance premium. The Group’s exposure to insurance price risk as of December 31, 2019 and 2020, as follows: December 31, 2019 Direct insurance Reinsurance assumed Reinsurance ceded Total (In millions of Korean won) General ￦ 999,348 ￦ 101,613 ￦ (579,922 ) ￦ 521,039 Automobile 2,101,780 — (40,067 ) 2,061,713 Long-term 2,550,236 — (367,904 ) 2,182,332 ￦ 5,651,364 ￦ 101,613 ￦ (987,893 ) ￦ 4,765,084 December 31, 2020 Direct insurance Reinsurance assumed Reinsurance ceded Total (In millions of Korean won) General ￦ 1,088,791 ￦ 79,429 ￦ (663,750 ) ￦ 504,470 Automobile 2,491,412 — (21,433 ) 2,469,979 Long-term 2,803,532 — (415,439 ) 2,388,093 ￦ 6,383,735 ￦ 79,429 ￦ (1,100,622 ) ￦ 5,362,542 38.5.4 Concentration of insurance risk The Group is selling general non-life non-life, 38.5.5 Claims development tables The Group uses claim development of payments and the estimated ultimate claims for the years where the accident has occurred, in order to maintain overall reserve adequacy in respect of general, automobile and long-term insurance. When the estimated ultimate claims are greater than claim payments, the Group establishes additional reserves. Claims development tables as of December 31, 2019 and 2020, are as follows: <2019> General Insurance Payment year Accident year After 1 year After 2 years After 3 years After 4 years After 5 years (In millions of Korean won) Estimate of gross ultimate claims (A) 2015.1.1 ~ 2015.12.31 ￦ 125,162 ￦ 144,566 ￦ 147,031 ￦ 147,616 ￦ 148,995 2016.1.1 ~ 2016.12.31 145,618 167,818 171,205 178,265 — 2017.1.1 ~ 2017.12.31 168,409 200,704 204,538 — — 2018.1.1 ~ 2018.12.31 200,280 237,111 — — — 2019.1.1 ~ 2019.12.31 220,474 — — — — 859,943 750,199 522,774 325,881 148,995 Gross cumulative claim payments (B) 2015.1.1 ~ 2015.12.31 93,443 129,764 137,157 141,218 143,985 2016.1.1 ~ 2016.12.31 108,098 151,283 162,059 170,353 — 2017.1.1 ~ 2017.12.31 132,430 184,333 193,811 — — 2018.1.1 ~ 2018.12.31 153,770 216,705 — — — 2019.1.1 ~ 2019.12.31 185,832 — — — — 673,573 682,086 493,027 311,571 143,985 Difference (A-B) ￦ 186,369 ￦ 68,112 ￦ 29,747 ￦ 14,310 ￦ 5,010 Automobile Insurance Payment year Accident year After 1 year After 2 After 3 After 4 After 5 After 6 After 7 years (In millions of Korean won) Estimate of gross ultimate claims (A) 2013.1.1 ~ 2013.12.31 ￦ 1,131,945 ￦ 1,156,535 ￦ 1,170,968 ￦ 1,179,458 ￦ 1,179,323 ￦ 1,179,514 ￦ 1,180,458 2014.1.1 ~ 2014.12.31 1,174,611 1,193,832 1,205,524 1,212,025 1,212,162 1,214,524 — 2015.1.1 ~ 2015.12.31 1,227,106 1,245,780 1,256,058 1,263,044 1,267,142 — — 2016.1.1 ~ 2016.12.31 1,276,939 1,281,381 1,287,728 1,294,735 — — — 2017.1.1 ~ 2017.12.31 1,342,998 1,348,828 1,358,867 — — — — 2018.1.1 ~ 2018.12.31 1,468,784 1,471,807 — — — — — 2019.1.1 ~ 2019.12.31 1,591,793 — — — — — — 9,214,176 7,698,163 6,279,145 4,949,262 3,658,627 2,394,038 1,180,458 Gross cumulative claim payments (B) 2013.1.1 ~ 2013.12.31 939,569 1,114,063 1,145,110 1,161,624 1,168,617 1,175,681 1,178,158 2014.1.1 ~ 2014.12.31 969,211 1,150,462 1,180,953 1,196,387 1,204,580 1,208,421 — 2015.1.1 ~ 2015.12.31 1,020,975 1,198,241 1,228,357 1,245,779 1,254,187 — — 2016.1.1 ~ 2016.12.31 1,052,830 1,235,656 1,264,651 1,282,346 — — — 2017.1.1 ~ 2017.12.31 1,104,158 1,306,235 1,335,962 — — — — 2018.1.1 ~ 2018.12.31 1,224,820 1,428,973 — — — — — 2019.1.1 ~ 2019.12.31 1,332,849 — — — — — — 7,644,412 7,433,630 6,155,033 4,886,136 3,627,384 2,384,102 1,178,158 Difference (A-B) ￦ 1,569,764 ￦ 264,533 ￦ 124,112 ￦ 63,126 ￦ 31,243 ￦ 9,936 ￦ 2,300 Long-term Insurance Payment year Accident year After 1 year After 2 After 3 After 4 After 5 After 6 After 7 (In millions of Korean won) Estimate of gross ultimate claims (A) 2013.1.1 ~ 2013.12.31 ￦ 709,602 ￦ 965,587 ￦ 997,607 ￦ 1,003,646 ￦ 1,006,025 ￦ 1,007,041 ￦ 1,008,589 2014.1.1 ~ 2014.12.31 789,087 1,083,048 1,114,821 1,119,206 1,122,192 1,123,240 — 2015.1.1 ~ 2015.12.31 885,476 1,219,393 1,256,051 1,266,881 1,270,967 — — 2016.1.1 ~ 2016.12.31 1,064,744 1,437,573 1,485,839 1,500,403 — — — 2017.1.1 ~ 2017.12.31 1,184,224 1,614,903 1,670,929 — — — — 2018.1.1 ~ 2018.12.31 1,372,706 1,881,046 — — — — — 2019.1.1 ~ 2019.12.31 1,626,481 — — — — — — 7,632,320 8,201,550 6,525,247 4,890,136 3,399,184 2,130,281 1,008,589 Gross cumulative claim payments (B) 2013.1.1 ~ 2013.12.31 671,500 953,494 989,957 999,944 1,003,715 1,005,796 1,007,865 2014.1.1 ~ 2014.12.31 744,944 1,065,792 1,104,468 1,114,341 1,119,531 1,122,378 — 2015.1.1 ~ 2015.12.31 836,471 1,205,130 1,248,475 1,262,528 1,269,557 — — 2016.1.1 ~ 2016.12.31 1,017,243 1,424,948 1,477,415 1,496,556 — — — 2017.1.1 ~ 2017.12.31 1,130,868 1,599,227 1,662,978 — — — — 2018.1.1 ~ 2018.12.31 1,319,613 1,868,434 — — — — — 2019.1.1 ~ 2019.12.31 1,574,696 — — — — — — 7,295,335 8,117,025 6,483,293 4,873,369 3,392,803 2,128,174 1,007,865 Difference (A-B) ￦ 336,985 ￦ 84,525 ￦ 41,954 ￦ 16,767 ￦ 6,381 ￦ 2,107 ￦ 724 <2020> General Insurance Payment year Accident year After 1 year After 2 years After 3 years After 4 years After 5 years (In millions of Korean won) Estimate of gross ultimate claims (A) 2016.1.1 ~ 2016.12.31 ￦ 145,618 ￦ 167,818 ￦ 171,206 ￦ 178,265 ￦ 180,160 2017.1.1 ~ 2017.12.31 168,409 200,699 204,368 206,201 — 2018.1.1 ~ 2018.12.31 200,968 241,474 246,871 — — 2019.1.1 ~ 2019.12.31 219,881 263,849 — — — 2020.1.1 ~ 2020.12.31 232,622 — — — — 967,498 873,840 622,445 384,466 180,160 Gross cumulative claim payments (B) 2016.1.1 ~ 2016.12.31 108,098 151,282 162,059 170,353 175,063 2017.1.1 ~ 2017.12.31 132,430 184,333 193,780 199,225 — 2018.1.1 ~ 2018.12.31 153,770 217,955 235,900 — — 2019.1.1 ~ 2019.12.31 185,645 246,397 — — — 2020.1.1 ~ 2020.12.31 167,129 — — — — 747,072 799,967 591,739 369,578 175,063 Difference (A-B) ￦ 220,426 ￦ 73,873 ￦ 30,706 ￦ 14,888 ￦ 5,097 Automobile Insurance Payment year Accident year After 1 year After 2 After 3 After 4 After 5 After 6 After 7 (In millions of Korean won) Estimate of gross ultimate claims (A) 2014.1.1 ~ 2014.12.31 ￦ 1,174,611 ￦ 1,193,833 ￦ 1,205,524 ￦ 1,212,025 ￦ 1,212,162 ￦ 1,214,524 ￦ 1,217,006 2015.1.1 ~ 2015.12.31 1,227,106 1,245,780 1,256,058 1,263,044 1,267,142 1,271,001 — 2016.1.1 ~ 2016.12.31 1,276,939 1,281,381 1,287,728 1,294,735 1,299,964 — — 2017.1.1 ~ 2017.12.31 1,342,998 1,348,828 1,358,867 1,368,016 — — — 2018.1.1 ~ 2018.12.31 1,468,784 1,471,807 1,481,509 — — — — 2019.1.1 ~ 2019.12.31 1,591,793 1,620,609 — — — — — 2020.1.1 ~ 2020.12.31 1,624,341 — — — — — — 9,706,572 8,162,238 6,589,686 5,137,820 3,779,268 2,485,525 1,217,006 Gross cumulative claim payments (B) 2014.1.1 ~ 2014.12.31 969,211 1,150,462 1,180,953 1,196,387 1,204,580 1,208,421 1,210,632 2015.1.1 ~ 2015.12.31 1,020,975 1,198,241 1,228,357 1,245,779 1,254,187 1,261,995 — 2016.1.1 ~ 2016.12.31 1,052,830 1,235,656 1,264,651 1,282,346 1,288,754 — — 2017.1.1 ~ 2017.12.31 1,104,158 1,306,235 1,335,962 1,350,174 — — — 2018.1.1 ~ 2018.12.31 1,224,820 1,428,973 1,456,532 — — — — 2019.1.1 ~ 2019.12.31 1,332,849 1,570,194 — — — — — 2020.1.1 ~ 2020.12.31 1,353,799 — — — — — — 8,058,642 7,889,761 6,466,455 5,074,686 3,747,521 2,470,416 1,210,632 Difference (A-B) ￦ 1,647,930 ￦ 272,477 ￦ 123,231 ￦ 63,134 ￦ 31,747 ￦ 15,109 ￦ 6,374 Long-term Insurance Payment year Accident year After 1 After 2 After 3 After 4 After 5 After 6 After 7 (In millions of Korean won) Estimate of gross ultimate claims (A) 2014.1.1 ~ 2014.12.31 ￦ 789,088 ￦ 1,083,049 ￦ 1,114,820 ￦ 1,119,206 ￦ 1,122,191 ￦ 1,123,240 ￦ 1,124,628 2015.1.1 ~ 2015.12.31 885,476 1,219,394 1,256,051 1,266,881 1,270,967 1,273,615 — 2016.1.1 ~ 2016.12.31 1,064,744 1,437,573 1,485,839 1,500,403 1,506,889 — — 2017.1.1 ~ 2017.12.31 1,184,224 1,614,903 1,670,929 1,689,768 — — — 2018.1.1 ~ 2018.12.31 1,372,706 1,881,046 1,941,497 — — — — 2019.1.1 ~ 2019.12.31 1,626,481 2,229,830 — — — — — 2020.1.1 ~ 2020.12.31 1,818,316 — — — — — — 8,741,035 9,465,795 7,469,136 5,576,258 3,900,047 2,396,855 1,124,628 Gross cumulative claim payments (B) 2014.1.1 ~ 2014.12.31 744,944 1,065,792 1,104,468 1,114,341 1,119,531 1,122,378 1,123,868 2015.1.1 ~ 2015.12.31 836,471 1,205,130 1,248,475 1,262,528 1,269,557 1,272,648 — 2016.1.1 ~ 2016.12.31 1,017,243 1,424,948 1,477,415 1,496,556 1,503,841 — — 2017.1.1 ~ 2017.12.31 1,130,868 1,599,227 1,662,978 1,683,997 — — — 2018.1.1 ~ 2018.12.31 1,319,613 1,868,434 1,933,543 — — — — 2019.1.1 ~ 2019.12.31 1,574,696 2,211,717 — — — — — 2020.1.1 ~ 2020.12.31 1,749,647 — — — — — — 8,373,482 9,375,248 7,426,879 5,557,422 3,892,929 2,395,026 1,123,868 Difference (A-B) ￦ 367,553 ￦ 90,547 ￦ 42,257 ￦ 18,836 ￦ 7,118 ￦ 1,829 ￦ 760 38.5.6 Sensitivity analysis of insurance risk The Group manages insurance risk by performing sensitivity analysis based on discount rate, loss ratio and expense ratio which are considered to have significant influence on future cash flow, timing and uncertainty. According to result of sensitivity analysis there is no material influence on the equity and net profit before tax. December 31, 2019 Assumption Change Effect on LAT Insurance liabilities Profit before tax Equity (In millions of Korean won) Lapse ratio +10 % ￦ 495,287 ￦ — ￦ — ￦ — -10 % (553,013 ) — — — Loss ratio +10 % 4,576,415 — — — -10 % (4,576,415 ) — — — Expense ratio +10 % 342,587 — — — -10 % (342,587 ) — — — Discount rate +0.5 %p (1,521,385 ) — — — -0.5 %p 1,800,472 — — — December 31, 2020 Assumption change Effect on LAT Insurance liabilities Profit before tax Equity (In millions of Korean won) Lapse ratio +10 % ￦ 568,734 ￦ — ￦ — ￦ — -10 % (633,788 ) — — — Loss ratio +10 % 5,012,443 — — — -10 % (5,012,443 ) — — — Expense ratio +10 % 345,752 — — — -10 % (345,752 ) — — — Discount rate +0.5 %p (1,499,565 ) — — — -0.5 %p 1,726,707 — — — 38.5.7 Liquidity risk of insurance contracts Liquidity risk arising from insurance contracts is the increase in refunds at maturity caused by concentrations of maturity, the increase in surrender values caused by unexpected amounts in cancelation and the increase in payments of claims caused by catastrophic events. The Group manages payment of refunds payable at maturity by analyzing maturity of insurance. Premium reserve’s maturity structure as of December 31, 2019 and 2020, as follows: December 31, 2019* Up to 1 year 1~5 years 5~10 Years 10~20 years Over 20 years Total (In millions of Korean won) Long-term insurance non-participating Fixed interest type ￦ 57,532 ￦ 258,436 ￦ 84,349 ￦ 43,141 ￦ 125,622 ￦ 569,080 Variable interest type 527,467 2,578,004 2,085,054 777,340 13,336,668 19,304,533 584,999 2,836,440 2,169,403 820,481 13,462,290 19,873,613 Annuity Fixed interest type 10 543 2,244 3,714 1,075 7,586 Variable interest type 273 70,180 367,710 1,245,176 2,227,054 3,910,393 283 70,723 369,954 1,248,890 2,228,129 3,917,979 Asset-linked Variable interest type 27,389 — — — — 27,389 Total Fixed interest type 57,542 258,979 86,593 46,855 126,697 576,666 Variable interest type 555,129 2,648,184 2,452,764 2,022,516 15,563,722 23,242,315 ￦ 612,671 ￦ 2,907,163 ￦ 2,539,357 ￦ 2,069,371 ￦ 15,690,419 ￦ 23,818,981 December 31, 2020* Up to 1 year 1~5 years 5~10 years 10~20 years Over 20 years Total (In millions of Korean won) Long-term insurance non-participating Fixed interest type ￦ 70,782 ￦ 191,570 ￦ 78,092 ￦ 51,216 ￦ 175,387 ￦ 567,047 Variable interest type 663,210 2,304,298 1,937,621 845,404 14,716,753 20,467,286 733,992 2,495,868 2,015,713 896,620 14,892,140 21,034,333 Annuity Fixed interest type 5 717 2,203 3,817 738 7,480 Variable interest type 242 83,568 390,516 1,301,383 2,195,244 3,970,953 247 84,285 392,719 1,305,200 2,195,982 3,978,433 Asset-linked Variable interest type — — — — — — Total Fixed interest type 70,787 192,287 80,295 55,033 176,125 574,527 Variable interest type 663,452 2,387,866 2,328,137 2,146,787 16,911,997 24,438,239 ￦ 734,239 ￦ 2,580,153 ￦ 2,408,432 ￦ 2,201,820 ￦ 17,088,122 ￦ 25,012,766 * Includes long-term investment contract amounting to ￦ 108,938 million and ￦ 106,853 million, as of December 31, 2019 and 2020, respectively. 38.5.8 Credit risk of insurance contract Credit risk of insurance contract is the economic loss arising from non-performing BBB- As of December 31, 2020, there are 168 reinsurance companies that deal with the Group, and the top three reinsurance companies’ concentration and credit ratings are as follows: Reinsurance company Ratio Credit rating KOREAN RE 48.02 % AA MUNICH RE 3.94 % AAA ALLIANZGLOBAL 3.85 % AAA Exposures to credit risk related to reinsurance as of December 31, 2019 and 2020 as follows: December 31, December 31, (In millions of Korean won) Reinsurance assets 1 ￦ 735,196 ￦ 1,199,354 Receivables from reinsurers 2 328,177 252,064 ￦ 1,063,373 ￦ 1,451,418 1 Net carrying amounts after impairment loss 2 Net carrying amounts after allowance for credit losses 38.5.9 Interest rate risk of insurance contract The interest rate risk exposure from the Group’s insurance contracts is the risk of unexpected losses in net interest income or net assets arising from changes in interest rates and it is managed to minimize unexpected loss. For long-term, non-life 38.5.9.1 Exposure to interest rate risk December 31, 2019 December 31, 2020 (In millions of Korean won) Interest bearing liabilities Fixed interest rate type ￦ 534,236 ￦ 501,147 Variable interest rate type 21,911,393 23,213,667 ￦ 22,445,629 ￦ 23,714,814 Interest bearing assets Due from financial institutions measured at amortized cost and cash equivalents ￦ 108,559 ￦ 160,249 Financial assets at fair value through profit or loss 4,560,512 3,823,603 Financial assets at fair value through other comprehensive income 2,984,738 3,983,567 Securities measured at amortized cost 8,163,485 8,700,196 Loans measured at amortized cost 6,924,597 6,271,484 ￦ 22,741,891 ￦ 22,939,099 38.5.9.2 Measurement and recognition method Duration is used to measure interest rate risk within risk-based solvency test. ALM system is utilized to manage interest rate risk internally. In addition, Risk Management Committee sets ALM strategy every year to manage interest rate risk. 38.5.9.3 Sensitivity to changes in interest rates Generally, when interest rates rise, the value and duration of assets and liabilities fall when interest rates fall, value and duration of assets and liabilities increase. Where duration of assets is shorter than that of liabilities with the interest rates fall, the interest rate risk is increased since the incremental portion of liabilities exceeds that of assets. 38.5.9.4 Negative spread risk control In order to manage the negative margins risk between interest expenses on liabilities and investment incomes on assets, the Group sets the disclosure rate every month considering the market interest rate and the investment yield. 38.6 Risk Management of KB Life Insurance Co., Ltd. 38.6.1 Overview Insurance risk is the risk of loss arising from the actual risk at the time of claims exceeding the estimated risk at the time of underwriting. Insurance risk is classified by insurance price risk and policy reserve risk. Insurance price risk is the risk of loss arising from differences between received from policyholders and actual claims paid. Policy reserve risk is the risk of loss arising from differences between policy reserves the Group holds and actual claims to be paid. Therefore, loss is recognized if actual claims are more than policy reserves. KB Life Insurance Co., Ltd. measures only insurance price risk under RBC requirement because life insurance claim pay-out 38.6.2 Concentration of insurance risk and reinsurance policy The Group uses reinsurance to mitigate concentration of insurance risk seeking an enhanced capital management. The Group categorized

Statement Of Cash Flows

Statement Of Cash Flows	12 Months Ended
	Dec. 31, 2020
Statement Of Cash Flows Abstract [Abstract]
Disclosure Of Cash Flow Statement Explanatory	39. Statement of Cash Flows 39.1 Details of cash and cash equivalents as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Cash ￦ 2,311,418 ￦ 2,560,970 Checks with other banks 383,500 327,781 Due from the Bank of Korea 8,607,911 12,340,532 Due from other financial institutions 9,535,049 10,379,559 20,837,878 25,608,842 Due from financial institutions measured at fair value through profit or loss 216,367 100,094 21,054,245 25,708,936 Restricted due from financial institutions (13,372,966 ) (15,303,363 ) Due from financial institutions with original maturities over three months (1,557,554 ) (1,720,481 ) (14,930,520 ) (17,023,844 ) ￦ 6,123,725 ￦ 8,685,092 39.2 Significant non-cash 2018 2019 2020 (In millions of Korean won) Decrease in loans due to write-offs ￦ 1,079,435 ￦ 1,188,584 ￦ 1,283,071 Changes in financial investments due to debt-for-equity 22,286 104,815 13,820 Changes in accumulated other comprehensive income from valuation of financial instruments at fair value through other comprehensive income 119,182 35,490 496,159 Changes in accumulated other comprehensive income from valuation of investments in associates (3,733 ) 7,695 (6,978 ) Changes in other payables due to treasury stock trust agreement, etc. 6,678 — — 39.3 Cash inflows and outflows from income tax, interests and dividends for the years ended December 31, 2018, 2019 and 2020, are as follows: Activity 2018 2019 2020 (In millions of Korean won) Income tax paid Operating ￦ 759,013 ￦ 1,223,084 ￦ 1,119,252 Interest received Operating 13,958,806 14,936,705 14,986,532 Interest paid Operating 4,369,345 5,365,595 5,266,158 Dividends received Operating 235,243 185,846 187,699 Dividends paid Financing 766,728 766,249 883,952 39.4 Changes in liabilities arising from financing activities for the years ended December 31, 2019 and 2020, are as follows: 2019 Non-cash Beginning Net cash Acquisition Exchange Changes in fair value Subsidiaries Others Ending (In millions of Korean won) Derivatives held for hedging* ￦ 8,049 ￦ (28,631 ) ￦ — ￦ — ￦ 139,771 ￦ — ￦ 67,912 ￦ 187,101 Borrowings 86,283,531 2,537,391 — 397,571 67,297 (602,388 ) 71,041 88,754,443 Due to trust accounts 5,285,108 (68,648 ) — — — — — 5,216,460 Changes in non-controlling 9,110 574,580 — 345 — — 1,372 585,407 Others 167,128 (95,723 ) 766,259 35,591 — — (4,699 ) 868,556 ￦ 91,752,926 ￦ 2,918,969 ￦ 766,259 ￦ 433,507 ￦ 207,068 ￦ (602,388 ) ￦ 135,626 ￦ 95,611,967 2020 Non-cash Beginning Net cash Acquisition Exchange Changes in fair value Subsidiaries Others Ending (In millions of Korean won) Derivatives held for hedging* ￦ 187,101 ￦ (16,202 ) ￦ — ￦ (102,347 ) ￦ 10,553 ￦ 1,166 ￦ (137,467 ) ￦ (57,196 ) Borrowings 88,754,443 22,627,875 — (217,461 ) (591,619 ) 2,131,517 (116,912 ) 112,587,843 Due to trust accounts 5,216,460 2,326,495 — — — — — 7,542,955 Changes in non-controlling 585,407 (25,658 ) — 250,904 — — 47,130 857,783 Others 868,556 (63,065 ) 236,860 11 — — (23,287 ) 1,019,075 ￦ 95,611,967 ￦ 24,849,445 ￦ 236,860 ￦ (68,893 ) ￦ (581,066 ) ￦ 2,132,683 ￦ (230,536 ) ￦ 121,950,460 * Derivatives held for hedging purposes are the net amount after offsetting liabilities from assets. 39.5 The net cash flow associated with the changes in the subsidiaries for the years ended December 31, 2019 and 2020 was 91,592 million of cash inflow and 1,951,245 million of cash outflow, respectively.

Contingent Liabilities And Comm

Contingent Liabilities And Commitments	12 Months Ended
	Dec. 31, 2020
Disclosure Of Contingent Liabilities Abstract [Abstract]
Disclosure Of Commitments And Contingent Liabilities Explanatory	40. Contingent Liabilities and Commitments 40.1 Details of acceptances and guarantees as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Confirmed acceptances and guarantees Confirmed acceptances and guarantees in Korean won Acceptances and guarantees for KB purchasing loan ￦ 161,314 ￦ 144,457 Others 746,823 1,048,848 908,137 1,193,305 Confirmed acceptances and guarantees in foreign currencies Acceptances of letter of credit 155,151 221,422 Letter of guarantees 49,754 45,693 Bid bond 37,765 72,037 Performance bond 718,097 703,826 Refund guarantees 1,022,646 801,445 Others 2,935,939 3,072,099 4,919,352 4,916,522 Financial guarantees Acceptances and guarantees for issuance of debenture — 10,040 Acceptances and guarantees for mortgage 47,384 89,302 Overseas debt guarantees 406,680 410,470 International financing guarantees in foreign currencies 231,685 197,097 Others 230,000 50,950 915,749 757,859 6,743,238 6,867,686 Unconfirmed acceptances and guarantees Guarantees of letter of credit 1,845,508 2,094,989 Refund guarantees 654,497 344,112 2,500,005 2,439,101 ￦ 9,243,243 ￦ 9,306,787 40.2 Credit qualities of acceptances and guarantees exposure as of December 31, 2019 and 2020, are as follows: December 31, 2019 12-month Lifetime expected credit Total Non-impaired Impaired (In millions of Korean won) Confirmed acceptances and guarantees Grade 1 ￦ 4,220,046 ￦ 696 ￦ — ￦ 4,220,742 Grade 2 2,105,637 38,271 — 2,143,908 Grade 3 93,074 81,317 — 174,391 Grade 4 18,773 172,440 — 191,213 Grade 5 — 2,873 10,111 12,984 6,437,530 295,597 10,111 6,743,238 Unconfirmed acceptances and guarantees Grade 1 1,228,258 1,289 — 1,229,547 Grade 2 1,121,159 32,413 — 1,153,572 Grade 3 17,091 20,957 — 38,048 Grade 4 4,236 62,964 — 67,200 Grade 5 — 170 11,468 11,638 2,370,744 117,793 11,468 2,500,005 ￦ 8,808,274 ￦ 413,390 ￦ 21,579 ￦ 9,243,243 December 31, 2020 12-month Lifetime expected credit Total Non-impaired Impaired (In millions of Korean won) Confirmed acceptances and guarantees Grade 1 ￦ 4,377,798 ￦ 1,119 ￦ — ￦ 4,378,917 Grade 2 2,269,455 47,438 — 2,316,893 Grade 3 27,588 85,321 — 112,909 Grade 4 14,925 33,440 501 48,866 Grade 5 — 453 9,648 10,101 6,689,766 167,771 10,149 6,867,686 Unconfirmed acceptances and guarantees Grade 1 1,422,528 771 — 1,423,299 Grade 2 912,209 28,506 — 940,715 Grade 3 11,399 23,069 — 34,468 Grade 4 2,369 29,934 — 32,303 Grade 5 — 589 7,727 8,316 2,348,505 82,869 7,727 2,439,101 ￦ 9,038,271 ￦ 250,640 ￦ 17,876 ￦ 9,306,787 40.3 Acceptances and guarantees by counterparty as of December 31, 2019 and 2020, are as follows: December 31, 2019 Confirmed Unconfirmed Total Proportion (In millions of Korean won) Large companies ￦ 5,962,004 ￦ 1,904,346 ￦ 7,866,350 85.10 Small and medium-sized 650,612 397,539 1,048,151 11.34 Public sector and others 130,622 198,120 328,742 3.56 ￦ 6,743,238 ￦ 2,500,005 ￦ 9,243,243 100.00 December 31, 2020 Confirmed Unconfirmed Total Proportion (In millions of Korean won) Large companies ￦ 5,538,003 ￦ 1,770,235 ￦ 7,308,238 78.53 Small and medium-sized 695,860 459,487 1,155,347 12.41 Public sector and others 633,823 209,379 843,202 9.06 ￦ 6,867,686 ￦ 2,439,101 ￦ 9,306,787 100.00 40.4 Acceptances and guarantees by industry as of December 31, 2019 and 2020, are as follows: December 31, 2019 Confirmed Unconfirmed Total Proportion (In millions of Korean won) Financial institutions ￦ 260,974 ￦ 23,999 ￦ 284,973 3.08 Manufacturing 3,373,220 1,627,840 5,001,060 54.11 Service 1,187,516 88,158 1,275,674 13.80 Wholesale and retail 1,126,976 597,998 1,724,974 18.66 Construction 467,114 20,590 487,704 5.28 Public sector 107,481 81,895 189,376 2.05 Others 219,957 59,525 279,482 3.02 ￦ 6,743,238 ￦ 2,500,005 ￦ 9,243,243 100.00 December 31, 2020 Confirmed Unconfirmed Total Proportion (In millions of Korean won) Financial institutions ￦ 632,947 ￦ 5,871 ￦ 638,818 6.86 Manufacturing 2,992,319 1,285,530 4,277,849 45.96 Service 920,352 89,457 1,009,809 10.85 Wholesale and retail 1,086,772 891,619 1,978,391 21.26 Construction 411,601 14,488 426,089 4.58 Public sector 104,925 103,285 208,210 2.24 Others 718,770 48,851 767,621 8.25 ￦ 6,867,686 ￦ 2,439,101 ￦ 9,306,787 100.00 40.5 Details of commitments as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Commitments Corporate loan commitments ￦ 41,930,407 ￦ 40,253,100 Retail loan commitments 42,582,736 46,450,857 Credit line of credit cards 60,667,219 65,325,863 Purchase of other securities 6,617,253 7,104,163 151,797,615 159,133,983 Financial Guarantees Credit line 2,340,141 3,522,809 Purchase of securities 591,500 683,800 2,931,641 4,206,609 ￦ 154,729,256 ￦ 163,340,592 40.6 Other Matters (including litigation) a) The Group has 122 pending lawsuits as a plaintiff (excluding simple lawsuits related to the collection or management of loans), with an aggregate claims of ￦ 396,881 million, and 275 pending lawsuits as a defendant (excluding simple lawsuits related to the collection or management of loans) with an aggregate claims of ￦ 2,009,603 million, which arose in the normal course of the business, as of December 31, 2020. Details of major pending lawsuits in which the Group is a defendant are as follows: (in number of cases, in millions of Korean won) Company Lawsuits No. of Amount Description of the lawsuits Status of the lawsuits Kookmin Bank Request for a return of redemption amount 1 ￦ 48,068 Kookmin Bank invested the assets entrusted by OO Asset Management and OO Investment Trust Management in the Fairfield Sentry Limited, and Fairfield Sentry Limited reinvested the assets in Bernard L. Madoff Investment Securities LLC managed by Bernard Madoff (Bernard L. Madoff Investment Securities LLC is in the liquidation process due to Ponzi scheme fraud-related losses). Bankruptcy trustee of Bernard L. Madoff Investment Securities LLC filed a lawsuit against Kookmin Bank seeking to return the amount of redemptions received by Kookmin Bank through Fairfield Sentry Limited. Application for incineration by the defendant has been denied, and further proceedings are scheduled. [Related litigation is in progress at the New York Southern District Bankruptcy Court (10-03777) Kookmin Bank Request for compensation for damages 1 1,629,557 The plaintiff filed a lawsuit for compensation for damages against Indonesian Financial Supervisory Authority (OJK) and Kookmin Bank as joint defendants, claiming that the capital increase and Kookmin Bank’s acquisition of PT Bank Bukopin TBK was illegal in violation of local laws and regulations in Indonesia. It is difficult to accurately predict the result of the lawsuit as of now because the complaint has not been received, but it is judged that the possibility that the result of this lawsuit will have a significant impact on the financial position of Kookmin Bank is low. KB Securities Co., Ltd. Request for a return of transaction amount (Australian fund) 1 100,000 The plaintiffs OOOO Securities and OOOO Life Insurance filed lawsuits, claiming that the KB Securities Co., Ltd. provided false information on major matters in the product description while selling JB Australia NDIS Private Fund No.1 (on April 25, 2019, plaintiffs invested ￦ 50 billion each) (a) (Primary claim) requesting KB Securities Co., Ltd. to return unjust enrichment of ￦ 100 billion for cancelation of sales contracts of beneficiary certificates due to an error or termination of the contract due to default, (b) (Secondary claim) requesting for compensation for damages in investments amounting to ￦ 100 billion due to violation of the investor protection obligation and fraudulent transactions of KB Securities Co., Ltd. and OOO Asset Management. First trial is in progress (second hearing for the first trial is scheduled on April 2, 2021). b) On April 10, 2020, Kookmin Bank acquired 70% shares of PRASAC Microfinance Institution Plc. (“PRASAC”), a specialized credit micro finance institution in Cambodia, for US$ 603 million from its existing shareholders. Kookmin Bank has signed an agreement with the existing shareholders of PRASAC. The existing shareholders have the right of put option to sell 30% of the remaining shares to Kookmin Bank, and they are entitled to exercise their rights at the exercise price calculated on the basis of the adjusted book value of net asset as of 2021 year-end, c) Kookmin Bank has entered into an agreement with PT Bosowa Corporindo, a major shareholder of PT Bank Bukopin TBK. Under this agreement, Kookmin Bank and PT Bosowa Corporindo have a right of first refusal and a tag-along d) In June 2013, KB Kookmin Card Co., Ltd. had an accident in which cardholders’ personal information was stolen (hereinafter referred to as “accident”) due to illegal activities by employees of personal credit information company in charge of development of the system upgrading to prevent fraudulent use of credit card. As a result, KB Kookmin Card Co., Ltd. was notified by the Financial Services Commission of the suspension of some new business for 3 months as of February 16, 2014. In respect of the incident, the Group faces 11 and 2 legal claims filed as a defendant, with an aggregate claim of ￦ 444 million and ￦ 108 million as of December 31, 2019 and 2020 and a provision for these lawsuits amounting ￦ 2,549 million was recognized as of December 31, 2019. In addition, the Group takes out the personal information protection liability insurance as of December 31, 2020. e) As of December 31, 2020, the Group is not able to dispose, transfer or collateralize the shares or rights of shares of KB KOLAO Leasing Co., LTD. (“joint-venture lease company”) to a third party without the written consent of both KB Kookmin Card Co., Ltd. and Kolao Holdings, for five years (the restriction period for the disposal of its equity) after the date of initial investment for KB KOLAO LEASING CO., LTD. However, KB Kookmin Card Co., Ltd. and KB Capital Co., Ltd. may transfer all or part of their shares in the joint-venture lease company to affiliates who agree to comply with all the terms and conditions of this agreement on the establishment and operation of the joint-venture lease company in Laos and agree to succeed their responsibility for the joint-venture lease company. After the expiration of the restriction period for the disposal, as prescribed separately, each party of the joint-venture lease company may transfer all or part of their shares. Meanwhile, KB KOLAO Leasing Co., LTD. is selling LVMC Holdings (formerly Kolao Holdings) allied receivables that are more than three months overdue to Lanexang Leasing Co., Ltd. in accordance with an agreement. f) As of December 31, 2020, KB Capital Co., Ltd. and PT Sunindo Primasura are required to hold the shares of PT Sunindo Kookmin Best Finance for five years after the completion of the share purchase. If one party is going to sell all or part of the shares, provide them as collateral, trade or dispose of them, it should give the opportunity to exercise preemption to the other party by providing written proposal including transfer price, payment method and others. Meanwhile, the shareholders of PT Sunindo Kookmin Best Finance can receive dividends for up to 20% of net profit after taxes for each fiscal year starting from the fiscal year ended December 31, 2023. g) KB Securities Co., Ltd., as a sales agency, sold ￦ 326,500 million of private equity funds and trusts, which loans to corporations (borrower) that invest in apartment rental businesses for the disabled in Australia, to individuals and institutional investors. However, management of the fund is impossible due to the breach of contract by local borrower in Australia, therefore there is a possibility of losses of principal to these funds subscribers. In this regard, there are three lawsuits in which the Group is the defendant as of December 31, 2020. There is a possibility that additional lawsuits will be filed in the future, but the magnitude and final outcome of the lawsuit are unpredictable. h) In relation to Lime Asset Management, KB Securities Co., Ltd. has a PIS (Portfolio Index Swap) contract, as of December 31, 2020, associated with ‘Lime Thetis Qualified Investor Private Investment Trust No.2’ and Lime Pluto FI Qualified Investor Private Investment Trust No.D-1’ i) The proliferation of COVID-19 • There is a possibility of uncertainty about the credit risk of a borrower that could be affected by COVID-19. • Uncertainty may arise about forward-looking macroeconomic information related to expected credit losses. • Korean won may depreciate against major foreign currencies. This may result in an increase in principal and interest payments on liabilities denominated in foreign currencies, and losses on foreign exchanges transactions. • A significant decrease in the fair value of the Group’s investment in an entity that could be affected by COVID-19 Meanwhile, the Group’s accounting policy related to COVID-19

Subsidiaries

Subsidiaries	12 Months Ended
	Dec. 31, 2020
Disclosure Of Significant Investments In Subsidiaries Abstract [Abstract]
Disclosure Of Significant Investments In Subsidiaries Explanatory	41. Subsidiaries 41.1 Details of major consolidated subsidiaries as of December 31, 2020, are as follows: Investor Investee Ownership Location Date of Industry KB Financial Group Inc. Kookmin Bank 100.00 Korea Dec. 31 Banking and foreign exchange transaction KB Securities Co., Ltd. 100.00 Korea Dec. 31 Financial investment KB Insurance Co., Ltd. 100.00 Korea Dec. 31 Non-life KB Kookmin Card Co., Ltd. 100.00 Korea Dec. 31 Credit card and installment financing Prudential Life Insurance Company of Korea Ltd. 100.00 Korea Dec. 31 Life insurance KB Asset Management Co., Ltd. 100.00 Korea Dec. 31 Collective investment and advisory KB Capital Co., Ltd. 100.00 Korea Dec. 31 Financial Leasing KB Life Insurance Co., Ltd. 100.00 Korea Dec. 31 Life insurance KB Real Estate Trust Co., Ltd. 100.00 Korea Dec. 31 Real estate trust management KB Savings Bank Co., Ltd. 100.00 Korea Dec. 31 Savings banking KB Investment Co., Ltd. 100.00 Korea Dec. 31 Capital investment KB Data System Co., Ltd. 100.00 Korea Dec. 31 Software advisory, development, and supply KB Credit Information Co., Ltd. 100.00 Korea Dec. 31 Collection of receivables or credit investigation Kookmin Bank Kookmin Bank Cambodia Plc. 100.00 Cambodia Dec. 31 Banking and foreign exchange transaction Kookmin Bank (China) Ltd. 100.00 China Dec. 31 Banking and foreign exchange transaction KB Microfinance Myanmar Co., Ltd. 100.00 Myanmar Dec. 31 Microfinance services PRASAC Microfinance Institution Plc. 70.00 Cambodia Dec. 31 Microfinance services PT Bank Bukopin TBK 67.00 Indonesia Dec. 31 Banking and foreign exchange transaction PT Bank Syariah Bukopin 92.78 Indonesia Dec. 31 Banking PT Bukopin Finance 97.03 Indonesia Dec. 31 Installment financing KB Bank Myanmar Co., Ltd. 100.00 Myanmar Dec. 31 Banking and foreign exchange transaction KB Securities Co., Ltd. KBFG Securities America Inc. 100.00 United States Dec. 31 Investment advisory and securities dealing activities KB Securities Hong Kong Ltd. 100.00 China Dec. 31 Investment advisory and securities dealing activities KB Securities Vietnam Joint Stock Company 99.70 Vietnam Dec. 31 Investment advisory and securities dealing activities KB FINA Joint Stock Company 100.00 Vietnam Dec. 31 Investment advisory and securities dealing activities KB Insurance Co., Ltd. Leading Insurance Services, Inc. 100.00 United States Dec. 31 Management service LIG Insurance (China) Co., Ltd. 100.00 China Dec. 31 Non-life PT. KB Insurance Indonesia 70.00 Indonesia Dec. 31 Non-life KB Claims Survey & Adjusting 100.00 Korea Dec. 31 Claim service KB Sonbo CNS 100.00 Korea Dec. 31 Management service KB Golden Life Care Co., Ltd. 100.00 Korea Dec. 31 Service KB Kookmin Card Co., Ltd. KB Daehan Specialized Bank Plc. 95.71 Cambodia Dec. 31 Auto Installment finance PT. KB Finansia Multi Finance 80.00 Indonesia Dec. 31 Auto Installment finance KB Capital Co., Ltd. PT Sunindo Kookmin Best Finance 85.00 Indonesia Dec. 31 Auto Installment finance KB Kookmin Card Co., Ltd., KB Capital Co., Ltd. KB KOLAO LEASING CO., LTD. 80.00 Laos Dec. 31 Auto Installment finance KB Asset Management Co., Ltd. KBAM Shanghai Advisory Services Co., Ltd. 100.00 China Dec. 31 General advisory 41.2 Details of consolidated structured entities as of December 31, 2020, are as follows: Consolidated structured entities Reasons for consolidation Trusts Kookmin Bank (development trust) and 10 others The Group controls the trust because it has power to determine management performance of the trust and is significantly exposed to variable returns that absorb losses through the guarantees of payment of principal, or payment of principal and fixed rate of return. Asset-backed securitization Able Hana Co., Ltd. and 127 others The Group controls these investees because it has power over relevant activities in the event of default, is significantly exposed to variable returns by providing lines of credit, ABCP purchase commitments or acquisition of subordinated debt and has ability to affect those returns through its power. Investment funds KB Global Platform Fund and 151 others Funds are consolidated if the Group, as a collective investor or operating manager (member), etc., can manage fund assets on behalf of other investors, or dismiss the collective investor and operating manager, and is substantially exposed to significant variable returns or has such rights. If the Group holds more than a majority of the ownership interests but does not have the power over relevant activities of structured entities in accordance with agreements with trust and other related parties, those structured entities are excluded from the consolidation. 41.3 Condensed financial information of major subsidiaries as of December 31, 2019 and 2020, and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019 2019 Assets Liabilities Equity Operating Profit (loss) Total (In millions of Korean won) Kookmin Bank 1 ￦ 387,425,038 ￦ 358,420,805 ￦ 29,004,233 ￦ 20,817,431 ￦ 2,439,079 ￦ 2,428,154 KB Securities Co., Ltd. 1,2 47,816,512 43,131,858 4,684,654 8,053,363 257,893 261,639 KB Insurance Co., Ltd. 1,2 36,552,368 32,689,460 3,862,908 12,661,927 234,327 366,362 KB Kookmin Card Co., Ltd. 1 22,990,114 18,925,195 4,064,919 3,102,186 316,546 306,251 KB Asset Management Co., Ltd. 1 310,018 114,776 195,242 148,780 48,899 48,490 KB Capital Co., Ltd. 1,2 11,190,568 10,036,077 1,154,491 931,694 117,028 115,524 KB Life Insurance Co., Ltd. 1 9,801,905 9,186,567 615,338 1,506,417 15,963 63,107 KB Real Estate Trust Co., Ltd. 377,938 85,132 292,806 119,899 61,713 61,672 KB Savings Bank Co., Ltd. 1,361,032 1,148,625 212,407 92,435 16,301 15,433 KB Investment Co., Ltd. 1 756,972 542,221 214,751 99,822 11,311 11,310 KB Data System Co., Ltd. 41,690 20,999 20,691 158,067 4,664 4,282 KB Credit Information Co., Ltd. 27,834 12,936 14,898 38,278 (256 ) (337 ) December 31, 2020 2020 Assets Liabilities Equity Operating Profit (loss) Total (In millions of Korean won) Kookmin Bank 1 ￦ 438,444,114 ￦ 408,036,040 ￦ 30,408,074 ￦ 24,519,818 ￦ 2,298,195 ￦ 2,905,953 KB Securities Co., Ltd. 1,2 57,570,654 52,516,488 5,054,166 10,040,497 425,622 449,507 KB Insurance Co., Ltd. 1,2 39,078,117 35,086,458 3,991,659 13,735,778 163,884 129,042 KB Kookmin Card Co., Ltd. 1 24,071,644 19,789,958 4,281,686 3,210,581 324,662 308,148 Prudential Life Insurance Company of Korea Ltd. 2 25,121,656 22,681,729 2,439,927 656,062 55,711 (31,718 ) KB Asset Management Co., Ltd. 1 335,601 112,522 223,079 191,427 57,317 57,802 KB Capital Co., Ltd. 1,2 12,823,748 11,392,177 1,431,571 1,300,378 141,646 139,949 KB Life Insurance Co., Ltd. 10,424,916 9,842,789 582,127 1,897,859 (23,185 ) (33,210 ) KB Real Estate Trust Co., Ltd. 1 437,619 108,096 329,523 139,070 66,874 66,718 KB Savings Bank Co., Ltd. 1,883,720 1,658,116 225,604 104,397 17,305 16,197 KB Investment Co., Ltd. 1 848,693 618,552 230,141 128,014 15,387 15,390 KB Data System Co., Ltd. 40,347 23,024 17,323 149,966 (1,729 ) (3,367 ) KB Credit Information Co., Ltd. 27,711 11,773 15,938 39,767 1,132 1,040 1 Financial information is based on its consolidated financial statements. 2 Includes fair value adjustments arising from the acquisition. 41.4 The Characteristics of Risks Associated with Consolidated Structured Entities The terms of contractual arrangements to provide financial support to consolidated structured entities are as follows: 41.4.1 The Group has provided payment guarantees of ￦ 4,082,878 million to K plus 1st L.L.C and other subsidiaries. 41.4.2 The Group provides capital commitment to 23 subsidiaries including KB Sinansan Line Private Special Asset Fund (SOC). The unexecuted amount of the capital commitment is ￦ 1,046,516 million. Based on the capital commitment, the Group is subject to increase its investment upon the request of the asset management company or the additional agreement among investors. 41.4.3 The Group provides the guarantees of payment of principal, or principal and fixed rate of return in case the operating results of the trusts are less than the guaranteed principal, or principal and fixed rate of return. 41.5 Changes in Subsidiaries 41.5.1 Subsidiaries newly included in consolidation for the year ended December 31, 2020, are as follows: Company Reasons of obtaining control Prudential Life Insurance Company of Korea Ltd. and 27 others Holds more than a majority of the ownership interests KB Hwaseong 1st L.L.C. and 82 others Holds the power in the event of default and is exposed to significant variable returns by providing lines of credit, ABCP purchase commitments or acquisition of subordinated debt KB Global Infrastructure Synergy Private Special Asset Fund and 21 others Holds the power to determine the operation of the funds and is exposed to variable returns by holding significant amount of ownership interests KB Smart Scale Up Fund and 2 others Holds the power as a general partner and is exposed to variable returns by holding significant amount of ownership interests 41.5.2 Subsidiaries excluded from consolidation for the year ended December 31, 2020, are as follows: Company Reasons of losing control KBH the 3rd L.L.C and 60 others Termination of the commitments Sechste Casalog KG and 16 others Liquidation KB Contents Panda iMBC Contents Venture Fund and 5 others Disposal Hyundai Smart Index Alpha Securities Feeder Investment Trust No.1 and 27 others Decrease in ownership interests to less than majority

Unconsolidated Structured Entit

Unconsolidated Structured Entities	12 Months Ended
	Dec. 31, 2020
Disclosure Of Unconsolidated Structured Entities Abstract [Abstract]
Disclosure Of Interests In Unconsolidated Structured Entities Explanatory	42. Unconsolidated Structured Entities 42.1 Nature, purpose and activities of the unconsolidated structured entities and how the structured entities are financed, are as follows: Nature Purpose Activity Method of Financing Structured financing Granting PF loans to SOC and real estate Granting loans to ships/aircrafts SPC Construction of SOC and real estate Building ships, construction and purchase of aircrafts Loan commitments through credit line, providing credit line and investment agreements Investment funds Investment in beneficiary certificates Investment in PEF and partnerships Management of fund assets Payment of fund fees and allocation of fund profits Sales of beneficiary certificate instruments Investment from general partners and limited partners Trusts Management of financial trusts; —Development trust —General unspecified money trust —Trust whose principal is not guaranteed —Other trusts Management of trusted financial assets Payment of trust fees and allocation of trust profits. Sales of trusted financial assets Asset-backed securitization Early cash generation through transfer of securitized assets Fees earned through services to SPC, such as providing lines of credit and ABCP purchase commitments Fulfillment of asset-backed securitization plan Purchase and collection of securitized assets Issuance and repayment of ABS and ABCP Issuance of ABS and ABCP based on securitized assets 42.2 Details of scale of unconsolidated structured entities and nature of the risks associated with the Group’s interests in unconsolidated structured entities as of December 31, 2019 and 2020, are as follows: December 31, 2019 Structured Investment Trusts Asset-backed and others Total (In millions of Korean won) Total assets of unconsolidated structured entities ￦ 54,206,404 ￦ 180,236,568 ￦ 2,287,172 ￦ 99,012,931 ￦ 335,743,075 Carrying amount in the financial statements Assets Financial assets at fair value through profit or loss ￦ 132,685 ￦ 9,846,278 ￦ — ￦ 2,405,228 ￦ 12,384,191 Derivative financial assets — — — 2,959 2,959 Loans measured at amortized cost 4,775,723 293,221 266,974 920,863 6,256,781 Financial investments — — — 5,166,578 5,166,578 Investment in associates — 352,488 — — 352,488 Other assets 1,876 69,353 93,613 9,181 174,023 ￦ 4,910,284 ￦ 10,561,340 ￦ 360,587 ￦ 8,504,809 ￦ 24,337,020 Liabilities Deposits ￦ 523,086 ￦ 90,131 ￦ — ￦ 409,246 ￦ 1,022,463 Derivative financial liabilities — — — 228 228 Other liabilities 1,362 78 — 16,169 17,609 ￦ 524,448 ￦ 90,209 ￦ — ￦ 425,643 ￦ 1,040,300 Maximum exposure* Assets held ￦ 4,910,284 ￦ 10,561,340 ￦ 360,587 ￦ 8,504,809 ￦ 24,337,020 Purchase and investment commitments 38,650 3,980,356 — 945,598 4,964,604 Unused credit 654,203 2,900 28,427 1,927,902 2,613,432 Acceptances and guarantees and loan commitments 1,816,411 7,188 — 600,664 2,424,263 ￦ 7,419,548 ￦ 14,551,784 ￦ 389,014 ￦ 11,978,973 ￦ 34,339,319 Methods of determining the maximum exposure Loan Investments / Trust Providing December 31, 2020 Structured Investment Trusts Asset-backed and others Total (In millions of Korean won) Total assets of unconsolidated structured entities ￦ 56,200,300 ￦ 285,528,467 ￦ 1,984,006 ￦ 116,115,027 ￦ 459,827,800 Carrying amount in the financial statements Assets Financial assets at fair value through profit or loss ￦ 164,996 ￦ 11,151,958 ￦ — ￦ 2,308,917 ￦ 13,625,871 Derivative financial assets — — — 3,005 3,005 Loans measured at amortized cost 4,655,337 379,727 262,382 1,080,824 6,378,270 Financial investments — — — 7,849,054 7,849,054 Investment in associates — 396,953 — — 396,953 Other assets 2,572 3,257 91,297 16,363 113,489 ￦ 4,822,905 ￦ 11,931,895 ￦ 353,679 ￦ 11,258,163 ￦ 28,366,642 Liabilities Deposits ￦ 612,023 ￦ 26,839 ￦ — ￦ 344,221 ￦ 983,083 Derivative financial liabilities — — — 1,307 1,307 Other liabilities 8,422 97 1 13,736 22,256 ￦ 620,445 ￦ 26,936 ￦ 1 ￦ 359,264 ￦ 1,006,646 Maximum exposure* Assets held ￦ 4,822,905 ￦ 11,931,895 ￦ 353,679 ￦ 11,258,163 ￦ 28,366,642 Purchase and investment commitments — 5,650,847 — 761,200 6,412,047 Unused credit 1,322,414 — 18,287 3,020,084 4,360,785 Acceptances and guarantees and loan commitments 883,342 16,650 — 684,257 1,584,249 ￦ 7,028,661 ￦ 17,599,392 ￦ 371,966 ￦ 15,723,704 ￦ 40,723,723 Methods of determining the maximum exposure Loan Investments / Trust Providing * Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2020
Disclosure Of Transactions Between Related Parties Abstract [Abstract]
Disclosure Of Related Party Explanatory	43. Related Party Transactions According to IAS No.24, the Group includes investments in associates, key management (including family members), and post-employment benefit plans of the Group and its related party companies in the scope of related parties. The Group discloses balances (receivables and payables) and other amounts arising from transactions with related parties in the notes to the consolidated financial statements. Refer to Note 13 for details of investments in associates and joint ventures. 43.1 2018 2019 2020 (In millions of Korean won) Associates and joint ventures Balhae Infrastructure Company Fee and commission income ￦ 6,691 ￦ 6,743 ￦ 6,817 Korea Credit Bureau Co., Ltd. Interest expense 127 21 7 Fee and commission income 1,194 1,056 957 Insurance income — 3 5 Fee and commission expense 1,909 2,541 3,280 Other operating expense 4 — 1 KB GwS Private Securities Investment Trust Fee and commission income 851 851 853 Incheon Bridge Co., Ltd. Interest income 9,426 8,612 4,345 Interest expense 296 483 334 Fee and commission income 9 — 23 Fee and commission expense 2 7 6 Insurance income 365 284 279 Gains on financial instruments at fair value through profit or loss 2,655 4,975 899 Reversal of credit losses 6 5 — Provision for credit losses 1 1 472 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 Fee and commission income 210 178 12 Aju Good Technology Venture Fund Interest expense 30 22 18 KB Star Office Private Real Estate Investment Trust No.1 Interest income 370 370 371 Interest expense 93 208 61 Fee and commission income 435 435 436 RAND Bio Science Co., Ltd. Interest expense 3 5 11 Other non-operating — 843 — SY Auto Capital Co., Ltd. Interest income 1,279 1,016 1,097 Interest expense — 1 2 Fee and commission income 73 34 39 Fee and commission expense 840 389 132 Insurance income 33 32 40 Other operating income 621 689 1,709 Other operating expense 415 288 121 Reversal of credit losses — 13 17 Provision for credit losses 14 — — Food Factory Co., Ltd. Interest income 9 41 52 Interest expense — — 12 Insurance income 5 4 5 Fee and commission expense 1 12 4 Gains on financial instruments at fair value through profit or loss 30 60 72 Reversal of credit losses 1 — — Provision for credit losses 1 1 8 KB Pre IPO Secondary Venture Fund No.1 Interest expense 27 7 3 Fee and commission income 110 110 110 Built On Co., Ltd.* Interest income 4 1 — Insurance income 2 1 — Losses on financial instruments at fair value through profit or loss 1 — — KB Private Equity Fund No.3 Fee and commission income 521 480 463 Wise Asset Management Co., Ltd. Interest expense 9 2 — Acts Co., Ltd. Interest income — 1 1 Insurance income 2 1 — Gains on financial instruments at fair value through profit or loss — 30 — Losses on financial instruments at fair value through profit or loss 1,851 — — Other non-operating 1,246 — — Dongjo Co., Ltd. Insurance income 2 2 1 Reversal of credit losses 31 — — APRO Co., Ltd.* Interest income — 19 7 Interest expense 1 4 1 Fee and commission expense — 17 — Insurance income 5 4 1 Provision for credit losses — — 1 POSCO-KB Fee and commission income 490 490 387 Interest expense 81 — — Dae-A Interest expense 9 8 7 Paycoms Co., Ltd. Interest income 10 10 10 Insurance income 1 1 — Gains on financial instruments at fair value through profit or loss 125 125 69 Big Dipper Co., Ltd. Fee and commission expense — — 768 Reversal of credit losses 2 — — KB-KDBC Pre-IPO Interest expense 39 58 23 Fee and commission income 322 449 300 KB-TS Fee and commission income 305 730 126 KB-SJ Fee and commission income 314 422 338 JLK Inspection Co., Ltd.* Interest income 6 — — Interest expense — 1 — TESTIAN Inc.* Interest income 4 3 — Gains on financial instruments at fair value through profit or loss 83 — — Rainist Co., Ltd. Gains on financial instruments at fair value through profit or loss — — 1,636 Fee and commission income — 39 36 Fee and commission expense — — 5 Interest expense 2 — — Iwon Alloy Co., Ltd. Insurance income 1 2 1 Bioprotect Ltd. Losses on financial instruments at fair value through profit or loss — — 216 RMGP Bio-Pharma Fee and commission income — — 27 Other non-operating 10 33 — Gains on financial instruments at fair value through profit or loss — 947 — Losses on financial instruments at fair value through profit or loss — 2,120 489 RMGP Bio-Pharma Losses on financial instruments at fair value through profit or loss — — 1 KB-MDI Fee and commission income — — 308 Losses on financial instruments at fair value through profit or loss — — 322 S&E BIO Interest expense — — 1 Contents First Interest expense — — 14 December & Company Inc. Interest expense — — 1 GENINUS Inc. Interest expense — — 70 Hasys. Gains on financial instruments at fair value through profit or loss — 136 — Losses on financial instruments at fair value through profit or loss 136 — — Insurance income 4 50 63 KB-Brain Scale-up Interest expense 21 89 40 Fee and commission income 108 735 734 Spark Biopharma Inc.* Interest expense 25 59 — SKYDIGITAL INC. Fee and commission income — — 4 KB No.8 Special Purpose Acquisition Company* Interest expense 17 — — Losses on financial instruments at fair value through profit or loss 2,330 — — KB No.9 Special Purpose Acquisition Company* Interest expense 43 (23 ) — Gains on financial instruments at fair value through profit or loss 48 — — Losses on financial instruments at fair value through profit or loss 2,256 — — KB No.10 Special Purpose Acquisition Company* Interest expense 30 18 — Gains on financial instruments at fair value through profit or loss 121 3,066 — KB No.11 Special Purpose Acquisition Company* Interest expense 12 9 — Gains on financial instruments at fair value through profit or loss 56 118 — KB No.17 Special Purpose Acquisition Company Fee and commission income — 175 — Gains on financial instruments at fair value through profit or loss — 1,384 4 Interest expense — 28 25 KB No.18 Special Purpose Acquisition Company Fee and commission income — 263 — Gains on financial instruments at fair value through profit or loss — 1,898 84 Interest expense — 28 31 KB No.19 Special Purpose Acquisition Company Fee and commission income — 150 — Gains on financial instruments at fair value through profit or loss — 1,044 11 Interest expense — 8 13 KB No.20 Special Purpose Acquisition Company Fee and commission income — — 210 Gains on financial instruments at fair value through profit or loss — — 1,568 Interest expense — 3 25 KB SPROTT Renewable Private Equity Fund No.1 Fee and commission income — 490 488 KB-Stonebridge Fee and commission income — 1,444 1,442 COSES GT Losses on financial instruments at fair value through profit or loss — 5 — Interest income — — 6 Provision for credit losses — — 4 WJ Private Equity Fund No.1 Fee and commission income — — 5 UPRISE, Inc. Interest income — — 2 Provision for credit losses — — 1 CWhy Inc. Losses on financial instruments at fair value through profit or loss — — 2,000 Insurance income — 3 — Stratio, Inc. Interest expense — 1 — NEXELON Inc.* Interest expense — 2 — CellinCells Co., Ltd. Interest expense — 19 4 Bomapp Inc. Fee and commission expense — — 9 Interest expense — 1 — Insurance income — 1 8 KB Social Impact Investment Fund Fee and commission income — 121 300 KB-UTC Fee and commission income — — 371 KBSP Private Equity Fund No.4 Fee and commission income — — 480 KB-NAU Fee and commission income — — 237 JR GLOBAL REIT Fee and commission income — — 6,210 IGIS No.371 Professional Investors’ Real Estate Investment Company* Fee and commission income — — 200 Koreit Tower Real Estate Investment Trust Company* Fee and commission income — — 2,852 2020 KB Fintech Renaissance Fund Fee and commission income — — 60 KB Material and Parts No.1 PEF Fee and commission income — — 63 FineKB Private Equity Fund No.1 Fee and commission income — — 38 Bluepointpartners Inc. Losses on financial instruments at fair value through profit or loss — — 68 KB-Solidus Fee and commission income — 81 777 Fabric Time Co., Ltd. Fee and commission income — — 9 Interest expense — — 47 BNF Corporation Ltd.* Interest income — 7 401 Fee and commission income — — 2 Gains on financial instruments at fair value through profit or loss — 158 — Provision for credit losses — 1 8 KB Cape No.1 Private Equity Fund Fee and commission income — 97 144 ALS Co., Ltd.* Interest income — 194 — Keystone-Hyundai Securities No.1 Private Equity Fund Fee and commission income 116 90 115 MJT&I Corp. Insurance income — 1 — Doosung Metal Co., Ltd.* Insurance income 1 — — Hyundai-Tongyang Agrifood Private Equity Fund* Fee and commission income 151 — — Bungaejangter. Inc.* Interest income 60 — — Inno Lending Co., Ltd.* Fee and commission income 1 — — KoFC KBIC Frontier Champ 2010-5(PEF)* Fee and commission income 197 — — Other Retirement pension Fee and commission income 876 939 1,077 Interest expense 3 4 3 * Excluded from the Group’s related party as of December 31, 2020. Meanwhile, the Group purchased installment financial assets, etc. from SY Auto Capital Co., Ltd. amounting to ￦ 1,393,346 million and ￦ 1,504,217 million for the years ended December 31, 2019 and 2020, respectively. 43.2 December 31, December 31, (In millions of Korean won) Associates and joint ventures Balhae Infrastructure Company Other assets ￦ 1,718 ￦ 1,733 Korea Credit Bureau Co., Ltd. Loans measured at amortized cost (gross amount) 43 36 Deposits 17,966 19,982 Provisions 1 — Insurance liabilities 2 1 Other liabilities — 623 KB GwS Private Securities Investment Trust Other assets 641 641 Incheon Bridge Co., Ltd. Financial assets at fair value through profit or loss 37,857 38,756 Loans measured at amortized cost (gross amount) 147,707 133,002 Allowances for credit losses 12 202 Other assets 520 545 Deposits 45,447 39,520 Provisions 10 292 Insurance liabilities 108 109 Other liabilities 346 205 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 Other assets 89 — Jungdo Co., Ltd. Deposits 4 4 Dongjo Co., Ltd. Insurance liabilities 1 1 Dae-A Deposits 753 636 Other liabilities 14 21 Aju Good Technology Venture Fund Deposits 5,456 3,093 Other liabilities 2 1 KB Star Office Private Real Estate Investment Trust No.1 Loans measured at amortized cost (gross amount) 10,000 10,000 Allowances for credit losses 4 5 Other assets 136 137 Deposits 8,293 4,255 Other liabilities 66 24 KB-Brain Scale-up Deposits 13,118 8,097 Other liabilities 4 1 WJ Private Equity Fund No.1 Other assets — 2 Deposits — 349 KB IGen Private Equity Fund No.1* Deposits 147 — KB Cape No.1 Private Equity Fund Financial assets at fair value through profit or loss 2,000 2,000 Other assets — 144 RAND Bio Science Co., Ltd. Deposits 4,452 693 Loans measured at amortized cost (gross amount) 1 1 SY Auto Capital Co., Ltd. Loans measured at amortized cost (gross amount) 41,990 40,060 Allowances for credit losses 4 57 Other assets 63 65 Deposits 8 6 Provisions 13 — Insurance liabilities 13 13 Other liabilities 70 76 Food Factory Co., Ltd. Financial assets at fair value through profit or loss 590 662 Loans measured at amortized cost (gross amount) 1,992 3,210 Allowances for credit losses 2 8 Other assets 1 3 Deposits 1,073 1,555 Provisions — 2 Insurance liabilities 4 5 Other liabilities 1 9 KB Pre IPO Secondary Venture Fund No.1 Deposits 2,955 629 Other liabilities 1 — Wise Asset Management Co., Ltd. Deposits 21 — Acts Co., Ltd. Deposits 1 18 Insurance liabilities — 1 Other liabilities 100 100 POSCO-KB Other assets — 264 Paycoms Co., Ltd. Other assets 1 1 Financial assets at fair value through profit or loss 1,157 1,226 Deposits 1 1 Big Dipper Co., Ltd. Loans measured at amortized cost (gross amount) 11 4 Deposits 6 1 KB-KDBC Pre-IPO Deposits 7,054 923 Other liabilities 4 — APRO Co., Ltd.* Loans measured at amortized cost (gross amount) 2,019 — Insurance liabilities 2 — Deposits 3,201 — Other liabilities 1 — Iwon Alloy Co., Ltd. Insurance liabilities 1 — Computerlife Co., Ltd. Deposits 1 — RMGP Bio-Pharma Financial assets at fair value through profit or loss 3,419 4,250 Other liabilities 2 71 RMGP Bio-Pharma Financial assets at fair value through profit or loss 8 9 Hasys. Financial assets at fair value through profit or loss 6,000 6,000 Deposits — 1 Insurance liabilities 37 39 SKYDIGITAL INC. Deposits 25 15 Rainist Co., Ltd. Financial assets at fair value through profit or loss 7,504 9,141 UPRISE, Inc. Financial assets at fair value through profit or loss 250 250 Loans measured at amortized cost (gross amount) — 500 Allowances for credit losses — 1 Deposits — 11 Stratio, Inc. Financial assets at fair value through profit or loss 1,000 1,000 Deposits 726 13 Honest Fund, Inc. Financial assets at fair value through profit or loss 3,999 3,999 CellinCells Co., Ltd. Financial assets at fair value through profit or loss 2,000 2,000 Loans measured at amortized cost (gross amount) 4 24 Deposits 1,545 260 Other liabilities 1 — Jo Yang Industrial Co., Ltd. Deposits 2 2 KB No.17 Special Purpose Acquisition Company Financial assets at fair value through profit or loss 2,683 2,687 Deposits 1,742 1,711 Other liabilities 27 23 KB No.18 Special Purpose Acquisition Company Financial assets at fair value through profit or loss 3,786 3,873 Deposits 2,140 2,101 Other liabilities 28 19 KB No.19 Special Purpose Acquisition Company Financial assets at fair value through profit or loss 2,043 2,055 Deposits 1,093 1,053 Other liabilities 7 3 KB No.20 Special Purpose Acquisition Company Financial assets at fair value through profit or loss 1,499 3,067 Deposits 1,984 1,716 Other liabilities 3 1 COSES GT Financial assets at fair value through profit or loss 2,930 4,930 Loans measured at amortized cost (gross amount) — 500 Allowances for credit losses — 4 Other assets — 1 Deposits — 292 Insurance liabilities — 1 CWhy Inc. Financial assets at fair value through profit or loss 2,000 — Bomapp Inc. Financial assets at fair value through profit or loss 1,999 1,999 Insurance liabilities 2 2 Channel Corporation Financial assets at fair value through profit or loss 2,000 4,551 MitoImmune Therapeutics Financial assets at fair value through profit or loss 5,000 5,000 KB-Solidus Other assets — 707 Bioprotect Ltd. Financial assets at fair value through profit or loss — 3,264 GOMI CORPORATION Financial assets at fair value through profit or loss — 500 Loans measured at amortized cost (gross amount) — 9 Deposits — 37 Copin Communications, Inc. Financial assets at fair value through profit or loss — 1,500 Go2joy Co., Ltd. Financial assets at fair value through profit or loss — 1,200 ClavisTherapeutics, Inc. Financial assets at fair value through profit or loss — 2,000 S&E BIO Financial assets at fair value through profit or loss — 2,000 Deposits — 1,142 Bluepointpartners Inc. Financial assets at fair value through profit or loss — 1,432 4N Inc. Financial assets at fair value through profit or loss — 200 Deposits — 76 Xenohelix Co., Ltd. Financial assets at fair value through profit or loss — 2,100 Contents First Financial assets at fair value through profit or loss — 6,146 Deposits — 1,823 Other liabilities — 7 KB-MDI Financial assets at fair value through profit or loss — 4,280 Other assets — 308 OKXE Inc. Financial assets at fair value through profit or loss — 800 GENINUS Inc. Financial assets at fair value through profit or loss — 5,599 Deposits — 13,630 Other liabilities — 15 FineKB Private Equity Fund No.1 Other assets — 38 NEOMIO CORP. Deposits — 535 December & Company Inc. Deposits — 1 KB Social Impact Investment Fund Other assets 73 — Fabric Time Co., Ltd. Financial assets at fair value through profit or loss 1,845 3,345 Loans measured at amortized cost (gross amount) — 59 Provisions — 1 Deposits 395 3,947 Other liabilities 2 40 BNF Corporation Ltd.* Financial assets at fair value through profit or loss 2,259 — Loans measured at amortized cost (gross amount) 1,400 — Other assets 2 — Deposits 947 — Other liabilities 6 — Key management Loans measured at amortized cost (gross amount) 3,538 5,153 Allowances for credit losses 1 2 Other assets 3 5 Deposits 15,339 17,167 Insurance liabilities 1,984 2,501 Other liabilities 289 371 Other Retirement pension Other assets 366 295 Other liabilities 17,620 10,600 * Excluded from the Group’s related party as of December 31, 2020, therefore, the remaining outstanding balances with those entities are not disclosed. 43.3 Significant lending transactions with related parties for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Increase Decrease Ending (In millions of Korean won) Associates and joint ventures Korea Credit Bureau Co., Ltd. ￦ 22 ￦ 43 ￦ (22 ) ￦ 43 Incheon Bridge Co., Ltd. 191,088 4,982 (10,506 ) 185,564 KB Star Office Private Real Estate Investment Trust No.1 10,000 — — 10,000 KB Cape No.1 Private Equity Fund — 2,000 — 2,000 RAND Bio Science Co., Ltd. 1 1 (1 ) 1 SY Auto Capital Co., Ltd. 48,356 28,088 (34,454 ) 41,990 Food Factory Co., Ltd. 730 1,872 (20 ) 2,582 Built On Co., Ltd.* 401 — (401 ) — Acts Co., Ltd. — 68 (68 ) — Paycoms Co., Ltd. 1,032 125 — 1,157 Big Dipper Co., Ltd. 5 11 (5 ) 11 APRO Co., Ltd.* — 2,019 — 2,019 JLK Inspection Co., Ltd.* 7,300 (7,300 ) — — TESTIAN Inc.* 615 24 (639 ) — RMGP Bio-Pharma 3,051 368 — 3,419 RMGP Bio-Pharma 4 4 — 8 Hasys. 5,864 136 — 6,000 Rainist Co., Ltd. 2,504 5,000 — 7,504 Spark Biopharma Inc.* 6,500 (6,500 ) — — UPRISE, Inc. 250 — — 250 Stratio, Inc. 1,000 — — 1,000 Honest Fund, Inc. — 3,999 — 3,999 CellinCells Co., Ltd. — 2,004 — 2,004 KB No.9 Special Purpose Acquisition Company* 2,481 — (2,481 ) — KB No.10 Special Purpose Acquisition Company* 2,025 — (2,025 ) — KB No.11 Special Purpose Acquisition Company* 737 — (737 ) — KB No.17 Special Purpose Acquisition Company — 2,683 — 2,683 KB No.18 Special Purpose Acquisition Company — 3,786 — 3,786 KB No.19 Special Purpose Acquisition Company — 2,043 — 2,043 KB No.20 Special Purpose Acquisition Company — 1,499 — 1,499 COSES GT — 2,930 — 2,930 CWhy Inc. — 2,000 — 2,000 Bomapp Inc. — 1,999 — 1,999 Channel Corporation — 2,000 — 2,000 MitoImmune Therapeutics — 5,000 — 5,000 Fabric Time Co., Ltd. — 1,845 — 1,845 BNF Corporation Ltd.* — 3,659 — 3,659 Key management 2,404 2,006 (872 ) 3,538 2020 Beginning Increase Decrease Ending (In millions of Korean won) Associates and joint ventures Korea Credit Bureau Co., Ltd. ￦ 43 ￦ 36 ￦ (43 ) ￦ 36 Incheon Bridge Co., Ltd. 185,564 901 (14,707 ) 171,758 Carlife Co., Ltd. — 22 (22 ) — KB Star Office Private Real Estate Investment Trust No.1 10,000 — — 10,000 KB Cape No.1 Private Equity Fund 2,000 — — 2,000 RAND Bio Science Co., Ltd. 1 1 (1 ) 1 SY Auto Capital Co., Ltd. 41,990 11,310 (13,240 ) 40,060 Food Factory Co., Ltd. 2,582 1,314 (24 ) 3,872 Acts Co., Ltd. — 74 (74 ) — Paycoms Co., Ltd. 1,157 69 — 1,226 Big Dipper Co., Ltd. 11 4 (11 ) 4 APRO Co., Ltd.* 2,019 2,000 (4,019 ) — RMGP Bio-Pharma 3,419 831 — 4,250 RMGP Bio-Pharma 8 1 — 9 Hasys. 6,000 — — 6,000 Rainist Co., Ltd. 7,504 1,637 — 9,141 UPRISE, Inc. 250 500 — 750 Stratio, Inc. 1,000 — — 1,000 Honest Fund, Inc. 3,999 — — 3,999 CellinCells Co., Ltd. 2,004 24 (4 ) 2,024 KB No.17 Special Purpose Acquisition Company 2,683 4 — 2,687 KB No.18 Special Purpose Acquisition Company 3,786 87 — 3,873 KB No.19 Special Purpose Acquisition Company 2,043 12 — 2,055 KB No.20 Special Purpose Acquisition Company 1,499 1,568 — 3,067 COSES GT 2,930 2,500 — 5,430 CWhy Inc. 2,000 — (2,000 ) — Bomapp Inc. 1,999 — — 1,999 Channel Corporation 2,000 2,551 — 4,551 MitoImmune Therapeutics 5,000 — — 5,000 Bioprotect Ltd. — 3,264 — 3,264 GOMI CORPORATION — 509 — 509 Copin Communications, Inc. — 1,500 — 1,500 Go2joy Co., Ltd. — 1,200 — 1,200 ClavisTherapeutics, Inc. — 2,000 — 2,000 S&E BIO — 2,000 — 2,000 Bluepointpartners Inc. — 1,432 — 1,432 4N Inc. — 200 — 200 Xenohelix Co., Ltd. — 2,100 — 2,100 Contents First — 6,146 — 6,146 KB-MDI — 4,280 — 4,280 Fabric Time Co., Ltd. 1,845 1,559 — 3,404 OKXE Inc. — 800 — 800 GENINUS Inc. — 5,599 — 5,599 BNF Corporation Ltd.* 3,659 1,000 (4,659 ) — Key management 3,538 5,141 (3,526 ) 5,153 * Excluded from the Group’s related party as of December 31, 2020. 43.4 Significant borrowing transactions with related parties for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Borrowing Repayment Others 1 Ending (In millions of Korean won) Associates and joint ventures Korea Credit Bureau Co., Ltd. ￦ 15,674 ￦ — ￦ (3,000 ) ￦ 5,292 ￦ 17,966 Incheon Bridge Co., Ltd. 43,666 25,260 (5,260 ) (18,219 ) 45,447 Doosung Metal Co., Ltd. 3 — — (3 ) — Jungdo Co., Ltd. 4 — — — 4 Dae-A 1,229 — — (476 ) 753 Carlife Co., Ltd. 2 — — (2 ) — Computerlife Co., Ltd. 1 — — — 1 SKYDIGITAL INC. 16 — — 9 25 Jo Yang Industrial Co., Ltd. — — — 2 2 Aju Good Technology Venture Fund 6,439 — — (983 ) 5,456 KB-KDBC Pre-IPO 7,088 15,000 (10,000 ) (5,034 ) 7,054 KB-Brain Scale-up 18,813 — — (5,695 ) 13,118 KB Star Office Private Real Estate Investment Trust No.1 7,946 5,018 (5,072 ) 401 8,293 SY Auto Capital Co., Ltd. 5 — — 3 8 KB No.9 Special Purpose Acquisition Company 2 2,275 — (2,266 ) (9 ) — KB No.10 Special Purpose Acquisition Company 2 1,666 — (1,618 ) (48 ) — KB No.11 Special Purpose Acquisition Company 2 658 — (530 ) (128 ) — KB No.17 Special Purpose Acquisition Company — 1,500 — 242 1,742 KB No.18 Special Purpose Acquisition Company — 2,200 (100 ) 40 2,140 KB No.19 Special Purpose Acquisition Company — 1,000 — 93 1,093 KB No.20 Special Purpose Acquisition Company — 1,500 — 484 1,984 RAND Bio Science Co., Ltd. 232 1,900 — 2,320 4,452 Wise Asset Management Co., Ltd. 696 — (682 ) 7 21 Built On Co., Ltd. 2 7 — — (7 ) — Food Factory Co., Ltd. 68 — — 1,005 1,073 Acts Co., Ltd. 29 — — (28 ) 1 Paycoms Co., Ltd. 1 — — — 1 Big Dipper Co., Ltd. 182 — — (176 ) 6 APRO Co., Ltd. 2 2,201 — — 1,000 3,201 Rainist Co., Ltd. 1 — — (1 ) — Spark Biopharma Inc. 2 2,630 17,000 (9,000 ) (10,630 ) — Stratio, Inc. 516 — — 210 726 NEXELON Inc. 2 — — (200 ) 200 — CellinCells Co., Ltd. — — — 1,545 1,545 KB IGen Private Equity Fund No.1 2 148 — — (1 ) 147 KB Pre IPO Secondary Venture Fund No.1 1,115 — — 1,840 2,955 Fabric Time Co., Ltd. — — — 395 395 BNF Corporation Ltd. 2 — — — 947 947 Key management 13,818 13,520 (14,611 ) 2,611 15,338 2020 Beginning Borrowing Repayment Others 1 Ending (In millions of Korean won) Associates and joint ventures Korea Credit Bureau Co., Ltd. ￦ 17,966 ￦ 1,000 ￦ — ￦ 1,016 ￦ 19,982 Incheon Bridge Co., Ltd. 45,447 20,000 (21,260 ) (4,667 ) 39,520 Jungdo Co., Ltd. 4 — — — 4 Dae-A 753 — — (117 ) 636 Computerlife Co., Ltd. 1 — — (1 ) — SKYDIGITAL INC. 25 — — (10 ) 15 Jo Yang Industrial Co., Ltd. 2 — — — 2 Aju Good Technology Venture Fund 5,456 1,442 — (3,805 ) 3,093 KB-KDBC Pre-IPO 7,054 1,500 (6,500 ) (1,131 ) 923 KB-Brain Scale-up 13,118 — — (5,021 ) 8,097 NEOMIO CORP. — — — 535 535 WJ Private Equity Fund No.1 — — — 349 349 KB Star Office Private Real Estate Investment Trust No.1 8,293 2,117 (5,630 ) (525 ) 4,255 SY Auto Capital Co., Ltd. 8 — — (2 ) 6 KB No.17 Special Purpose Acquisition Company 1,742 1,525 (1,500 ) (56 ) 1,711 KB No.18 Special Purpose Acquisition Company 2,140 2,063 (2,100 ) (2 ) 2,101 KB No.19 Special Purpose Acquisition Company 1,093 1,000 (1,000 ) (40 ) 1,053 KB No.20 Special Purpose Acquisition Company 1,984 1,522 (1,500 ) (290 ) 1,716 RAND Bio Science Co., Ltd. 4,452 2,250 (3,750 ) (2,259 ) 693 Wise Asset Management Co., Ltd. 21 — — (21 ) — Food Factory Co., Ltd. 1,073 1,503 (1,003 ) (18 ) 1,555 Acts Co., Ltd. 1 — — 17 18 Paycoms Co., Ltd. 1 — — — 1 Big Dipper Co., Ltd. 6 — — (5 ) 1 APRO Co., Ltd. 2 3,201 — — (3,201 ) — Hasys. — — — 1 1 Stratio, Inc. 726 — — (713 ) 13 UPRISE, Inc. — — — 11 11 CellinCells Co., Ltd. 1,545 — — (1,285 ) 260 COSES GT — — — 292 292 Fabric Time Co., Ltd. 395 7,002 (3,801 ) 351 3,947 BNF Corporation Ltd. 2 947 — — (947 ) — GOMI CORPORATION — — — 37 37 S&E BIO — — — 1,142 1,142 KB IGen Private Equity Fund No.1 2 147 — — (147 ) — KB Pre IPO Secondary Venture Fund No.1 2,955 — — (2,326 ) 629 4N Inc. — — — 76 76 Contents First — 4,000 (3,000 ) 823 1,823 December & Company Inc. — — — 1 1 GENINUS Inc. — — — 13,630 13,630 Key management 15,338 21,319 (20,410 ) 920 17,167 1 Transactions between related parties, such as settlements arising from operating activities and deposits, are expressed in net amount. 2 Excluded from the Group’s related party as of December 31, 2020. 43.5 2019 2020 Equity Withdrawal Equity Withdrawal (In millions of Korean won) Balhae Infrastructure Company ￦ 592 ￦ 6,855 ￦ 894 ￦ 6,973 KB GwS Private Securities Investment Trust — 7,276 — 9,523 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 — — — 3,230 POSCO-KB 2,500 — 5,000 2,125 KB Pre IPO Secondary Venture Fund No.1 — — — 585 KB-KDBC Pre-IPO 5,000 — — 6,400 KB-SJ 1,500 — 1,500 — Korea Credit Bureau Co., Ltd. — 135 — 90 KB-UTC 450 — 16,965 — KB-Solidus 10,400 13,520 10,920 4,940 KB-Stonebridge 7,070 1,855 9,093 — WJ Private Equity Fund No.1 — — 10,000 — All Together Korea Fund No.2 — — 100,000 90,127 KB Star Office Private Real Estate Investment Trust No.1 — 1,275 — 1,273 KB SPROTT Renewable Private Equity Fund No.1 1,667 — 4,129 — KB-NAU — — 5,700 — JR GLOBAL REIT — — 219,493 3,639 IGIS No.371 Professional Investors’ Real Estate Investment Company* — — 10,000 10,000 Koreit Tower Real Estate Investment Trust Company* — — 30,000 30,000 Project Vanilla Co., Ltd. — — 2,450 — December & Company Inc. — — 30,000 — KB Social Impact Investment Fund 1,500 — 1,500 — 2020 KB Fintech Renaissance Fund — — 550 — KB Material and Parts No.1 PEF — — 3,400 — KB Private Equity Fund No.3 — — — 8,000 KoFC KBIC Frontier Champ 2010-5 — 138 — — KB-TS 7,840 2,240 2,240 5,488 KB-Brain Scale-up 14,000 — 8,000 3,200 KB Cape No.1 Private Equity Fund 2,000 — — — Aju Good Technology Venture Fund 1,960 — — 2,885 KB No.9 Special Purpose Acquisition Company* — 16 — — KB No.17 Special Purpose Acquisition Company 1 — — — KB No.18 Special Purpose Acquisition Company 1 — — — KB No.19 Special Purpose Acquisition Company 1 — — — KB No.20 Special Purpose Acquisition Company 1 — — — KBSP Private Equity Fund No.4 6,100 — — — * Excluded from the Group’s related party as of December 31, 2020. 43.6 December 31, 2019 December 31, 2020 (In millions of Korean won or in a Associates and joint ventures Balhae Infrastructure Company Purchase of securities ￦ 7,327 ￦ 6,433 Korea Credit Bureau Co., Ltd. Unused lines of credit for credit card 557 564 KB GwS Private Securities Investment Trust Purchase of securities 876 — Aju Good Technology Venture Fund Purchase of securities 1,154 — Incheon Bridge Co., Ltd. Loan commitments in Korean won 20,000 20,000 Unused lines of credit for credit card 93 98 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 Purchase of securities 12,550 — Commitments on loss absorption priority 10,000 14,980 SY Auto Capital Co., Ltd. Loan commitments in Korean won 8,100 — Unused lines of credit for credit card 60 90 Food Factory Co., Ltd. Loan commitments in Korean won — 388 Unused lines of credit for credit card 25 73 KB No.17 Special Purpose Acquisition Company Unused lines of credit for credit card — 441 KB No.18 Special Purpose Acquisition Company Unused lines of credit for credit card 15 15 KB No.19 Special Purpose Acquisition Company Unused lines of credit for credit card 1 — CellinCells Co., Ltd. Unused lines of credit for credit card 20 — RAND Bio Science Co., Ltd. Unused lines of credit for credit card 24 24 Big Dipper Co., Ltd. Unused lines of credit for credit card 89 96 Fabric Time Co., Ltd. Unused lines of credit for credit card — 7 KB Pre IPO Secondary Venture Fund No.1 Commitments on loss absorption priority 1,671 1,671 POSCO-KB Purchase of securities 5,000 — KB-TS Purchase of securities 5,936 3,696 KB-SJ Purchase of securities 2,000 500 KB-Brain Scale-up Purchase of securities 18,000 10,000 KB SPROTT Renewable Private Equity Fund No.1 Purchase of securities 22,833 18,704 KB-Stonebridge Purchase of securities 27,930 18,837 KB Social Impact Investment Fund Purchase of securities 3,000 1,500 BNF Corporation Ltd.* Loan commitments in Korean won 360 — APRO Co., Ltd.* Unused lines of credit for credit card 96 — KB-UTC Purchase of securities 22,050 5,085 KB-NAU Purchase of securities — 24,300 All Together Korea Fund No.2 Purchase of securities — 990,000 FineKB Private Equity Fund No.1 Purchase of securities — 25,000 KB-Solidus Purchase of securities 24,700 2,120 RMGP Bio-Pharma Purchase of securities USD 8,911,002 USD 7,796,423 RMGP Bio-Pharma Purchase of securities USD 13,150 USD 17,132 KB-MDI Purchase of securities — USD 13,537,500 Key management Loan commitments in Korean won 1,695 1,760 * Excluded from the Group’s related party as of December 31, 2020. 43.7 Details of compensation to key management for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 Short-term Post-employment Share-based Total (In millions of Korean won) Registered directors (executive) ￦ 7,757 ￦ 418 ￦ 4,213 ￦ 12,388 Registered directors (non-executive) 960 — — 960 Non-registered 7,135 273 3,314 10,722 ￦ 15,852 ￦ 691 ￦ 7,527 ￦ 24,070 2019 Short-term Post-employment Share-based Total (In millions of Korean won) Registered directors (executive) ￦ 8,540 ￦ 425 ￦ 7,434 ￦ 16,399 Registered directors (non-executive) 1,030 — — 1,030 Non-registered 9,157 360 7,510 17,027 ￦ 18,727 ￦ 785 ￦ 14,944 ￦ 34,456 2020 Short-term Post-employment Share-based Total (In millions of Korean won) Registered directors (executive) ￦ 8,111 ￦ 672 ￦ 6,369 ￦ 15,152 Registered directors (non-executive) 1,133 — — 1,133 Non-registered 10,782 396 6,934 18,112 ￦ 20,026 ￦ 1,068 ￦ 13,303 ￦ 34,397 43.8 Assets pledged as collateral December 31, 2019 December 31, 2020 (In millions of Korean won) Associates KB Star Office Private Real Estate Investment Trust No.1 Real estate ￦ 13,000 ￦ 13,000 Key management Time deposits and others 192 213 Real estate 2,922 4,356 As of December 31, 2020, Incheon Bridge Co., Ltd., a related party, provides fund management account, civil engineering works insurance, and management and operations rights as senior collateral amounting to ￦ 611,000 million to the project financing group that consists of the Group and 5 other institutions, and as subordinated collateral amounting to ￦ 384,800 million to subordinated debt holders that consist of the Group and 2 other institutions. Also, it provides certificate of credit guarantee amounting to ￦ 400,000 million as collateral to the project financing group that consists of the Group and 5 other institutions.

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2020
Disclosure Of Business Combinations Abstract [Abstract]
Disclosure Of Detailed Information About Business Combinations Explanatory	44. Business Combination 44.1 Acquisition of Prudential Life Insurance Company of Korea Ltd. 44.1.1 General information On August 26, 2020, the Group obtained an approval from the Financial Services Commission to acquire Prudential Life Insurance Company of Korea Ltd. On August 31, 2020, the Group acquired 100 percent share in the subsidiary through purchase of shares and obtained control. The main purpose of the business combination is to improve competitiveness of life insurance business by including the acquiree into subsidiaries of the Group. 44.1.2 Identifiable assets acquired and liabilities assumed Details of consideration paid, assets acquired and liabilities assumed are as follows: 2020 (In millions of Consideration Cash ￦ 2,299,541 Total consideration transferred 2,299,541 Recognized amounts of identifiable assets acquired and liabilities assumed Cash and due from financial institutions 574,204 Financial assets at fair value through profit or loss 503,853 Financial assets at fair value through other comprehensive income 7,195,958 Securities measured at amortized cost 10,064,300 Loans measured at amortized cost 759,869 Derivatives 389 Property and equipment 178,537 Intangible assets 1 10,382 Other assets 4,931,131 Total assets 24,218,623 Insurance liabilities 2 16,752,888 Derivatives 1,166 Other liabilities 5,019,961 Total liabilities 21,774,015 Total identifiable net assets ￦ 2,444,608 Non-controlling interests — Gain on a bargain purchase 3 145,067 1 Memberships, software, development costs and others were previously held by Prudential Life Insurance Company of Korea Ltd. 2 Separately measured VOBA (Value of Business Acquired) was adjusted by applying an indirect method of intrinsic value to the carrying amount of insurance liabilities of the acquiree. 3 As a result of the business combination, gain on a bargain purchase was recognized as other non-operating For the allocation of consideration, the Group measured the acquiree’s identifiable assets and liabilities at their fair value at the acquisition date. The fair value is measured at the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. If the value is not directly observed, it is estimated using an appropriate valuation technique. Details of intangible assets recognized as the result of the business combination are as follows: 2020 (In millions of VOBA 1 ￦ (2,807,162 ) Others 2 10,382 ￦ (2,796,780 ) 1 Negative VOBA was recognized and adjusted in the insurance liability. In accordance with IFRS No.4, an indirect method of intrinsic value is applied to the measurement of VOBA. VOBA is a similar concept to present value of in force business (PVIF) and present value of future profits (PVFP or PVP). The VOBA from intrinsic values is calculated through the actuarial model and cash flows that were originally used to calculate the embedded value of the insurance contracts. 2 Memberships, software, development costs and others were previously held by Prudential Life Insurance Company of Korea Ltd. 44.1.3 Expenses related to business combination The Group incurred expenses of ￦ 10,183 million, including legal fees and due diligence fees, in connection with the business combination, and these were recognized as fee and commission expenses in the consolidated statement of comprehensive income. 44.1.4 Others Operating income and net profit of Prudential Life Insurance Company of Korea Ltd. for the period after the acquisition date were ￦ 92,535 million and ￦ 55,711 million, respectively, which are reflected in the consolidated statement of comprehensive income. If Prudential Life Insurance Company of Korea Ltd. was consolidated from the beginning of the current period, its operating income and net profit to be reflected in the consolidated statement of comprehensive income would be ￦ 529,678 million and ￦ 386,864 million, respectively. 44.2 Acquisition of PRASAC Microfinance Institution Plc (PRASAC). On April 10, 2020, the Group acquired 161 million shares which is 70% of total 230 million shares in PRASAC, a microfinance company in Cambodia, for US$ 603 million from existing shareholders. Therefore, PRASAC became a subsidiary of the Group. The main purpose of the business combination is to improve competitiveness of global business by maximizing the operational synergy with foreign subsidiaries. Details of consideration paid, assets acquired and liabilities assumed are as follows: 2020 (In millions of Consideration Cash ￦ 733,976 Total consideration transferred 733,976 Recognized amounts of identifiable assets acquired and liabilities assumed Cash and due from financial institutions 658,865 Loans measured at amortized cost 3,194,211 Financial investments 35 Property and equipment 24,472 Intangible assets 1,821 Current income tax assets 873 Deferred income tax assets 26,330 Other assets 37,325 Total assets 3,943,932 Deposits 2,222,944 Borrowings 1,038,684 Debentures 89,570 Current income tax liabilities 9,238 Deferred income tax liabilities 323 Other liabilities 101,696 Total liabilities 3,462,455 Total identifiable net assets ￦ 481,477 Non-controlling interests 1 144,443 Goodwill 2 396,942 1 Measured at the proportionate share (30%) of the fair value of PRASAC’s net assets as of the acquisition date. 2 As a result of the business combination, there was a goodwill and the Group recognized it as intangible assets in the consolidated statement of financial position. Details of loans acquired are as follows: 2020 (In millions of Acquiree’s carrying amount of loans ￦ 3,294,798 Present value of contractual cash flows not expected to be paid (100,587 ) Fair value of loans ￦ 3,194,211 The Group has signed an agreement with the existing shareholders of PRASAC. The existing shareholders have the right of put option to sell 30% of the remaining shares to the Group, and they are entitled to exercise their rights at the exercise price calculated on the basis of the adjusted book value of net asset as of 2021 year-end, Amount of the recognized liabilities and deducted equity in relation to the above agreement with shareholders are as follows: 2020 (In millions of Agreement with shareholders (purchase of remaining shares and payment of dividends) Other payables (present value of exercising price of options) ￦ 308,236 Other payables (present value of expected dividends) 102,986 ￦ 411,222 Attributable to ordinary equity holders of the Parent Company (capital surplus) (411,222 ) Operating income and net profit of PRASAC for the period after the acquisition date were ￦ 147,571 million and ￦ 118,339 million, respectively, which are reflected in the consolidated statement of comprehensive income, and the amount attributed to net profit to shareholders of the Parent Company is ￦ 82,837 million. If PRASAC was consolidated from the beginning of the current period, its operating income and net profit to be reflected in the consolidated statement of comprehensive income would be ￦ 183,735 million and ￦ 147,383 million, respectively and the amount that would have been attributed to net profit to shareholders of the Parent Company is ￦ 103,168 million. 44.3 Acquisition of PT Bank Bukopin TBK At the Board of Directors meeting held on July 16, 2020, the Group has decided to acquire additional ordinary shares of PT Bank Bukopin TBK, the Group’s associate, which operates a banking business in Indonesia, through issuance of shares in the form of an allotment to shareholders (1 st nd Accordingly, the Group acquired 2,967,600,372 ordinary shares for IDR 534,168,066,960 (￦ 43,909 million) from issuance of shares in the form of an allotment to shareholders (1 st nd paid-in The main purpose of the business combination is to improve competitiveness of global business by maximizing the operational synergy with foreign subsidiaries. Details of consideration paid, assets acquired and liabilities assumed are as follows: 2020 (In millions of Consideration Fair value of existing shares at the time of exchange ￦ 78,446 Cash (=16,360,578,947shares x 190 IDR) 252,722 Total consideration transferred 331,168 Recognized amounts of identifiable assets acquired and liabilities assumed Cash and due from financial institutions 300,424 Financial assets at fair value through profit or loss 3,960 Derivative assets 130 Loans measured at amortized cost 4,256,209 Financial investments 469,625 Property and equipment 280,197 Intangible assets 99,085 Deferred income tax assets 25,350 Assets held for sale 183,642 Other assets 272,775 Total assets 5,891,397 Deposits 4,253,557 Borrowings 838,142 Debentures 141,806 Provisions 3,522 Net defined benefit liabilities 15,141 Other liabilities 276,336 Total liabilities 5,528,504 Total identifiable net assets ￦ 362,893 Non-controlling interests 1 120,945 Goodwill 2 89,220 1 The sum of the existing non-controlling interests 2 As a result of the business combination, there was a goodwill and the Group recognized it as intangible assets in the consolidated statement of financial position. Details of loans acquired are as follows: 2020 (In millions of Acquiree’s carrying amount of loans ￦ 5,053,321 Present value of contractual cash flows not expected to be paid (797,112 ) Fair value of loans ￦ 4,256,209 In 2020, the Group measured 33.90% shares of PT Bank Bukopin TBK, which the Group held before the business combination, at fair value, and recognized ￦ 30,277 million as gain on investment in associates in the consolidated statement of comprehensive income. Operating loss and net loss of PT Bank Bukopin TBK for the period after the acquisition date were ￦ 61,051 million and ￦ 43,402 million, respectively, which are reflected in the consolidated statement of comprehensive income, and the amount attributed to net loss to shareholders of the Parent Company is ￦ 29,223 million. If PT Bank Bukopin TBK was consolidated from the beginning of the current period, its operating loss and net loss to be reflected in the consolidated statement of comprehensive income would be ￦ 190,584 million and ￦ 146,227 million, respectively and the amount that would have been attributed to net loss to shareholders of the Parent Company is ￦ 97,981 million. Details of intangible assets recognized as a result of business combinations are as follows: 2020 (In millions Core deposits 1 ￦ 95,477 Others 2 3,608 ￦ 99,085 1 It is an identifiable intangible asset and reflects the fair value of financing costs saved through stable relationships with saving customers. 2 Software and other intangible assets which were previously held by PT Bank Bukopin TBK. 44.4 Acquisition of PT. Finansia Multi Finance On July 3, 2020, the Group acquired 80 percent share in PT. Finansia Multi Finance, which is engaged in financial services in Indonesia, and obtained control. The main purpose of the business combination is to improve competitiveness of global business by maximizing the operational synergy with foreign subsidiaries. Details of consideration paid, assets acquired and liabilities assumed are as follows: 2020 (In millions of Consideration Cash ￦ 89,689 Total consideration transferred 89,689 Recognized amounts of identifiable assets acquired and liabilities assumed Cash and due from financial institutions 24,150 Loans measured at amortized cost 191,039 Property and equipment 13,837 Intangible assets 13,409 Other assets 17,587 Total assets 260,022 Borrowings 146,588 Debentures 46,865 Other liabilities 19,233 Total liabilities 212,686 Total identifiable net assets ￦ 47,336 Non-controlling interests 1 9,467 Goodwill 2 51,820 1 Measured at the proportionate share (20%) of the fair value of PT. Finansia Multi Finance’s net assets as of the acquisition date. 2 As a result of the business combination, there was a goodwill and the Group recognized it as intangible assets in the consolidated statement of financial position. The Group incurred expenses of ￦ 1,064 million and ￦ 1,623 million for the 2020 and 2019, respectively, including legal fees and due diligence fees, in connection with the business combination, and these were recognized as fee and commission expenses in the consolidated statement of comprehensive income. Operating loss and net loss of PT. Finansia Multi Finance for the period after the acquisition date were ￦ 4,432 million and ￦ 3,456 million, respectively, which are reflected in the consolidated statement of comprehensive income. If PT. Finansia Multi Finance was consolidated from the beginning of the current period, its operating loss and net loss to be reflected in the consolidated statement of comprehensive income would be ￦ 26,166 million and ￦ 19,187 million, respectively and the amount that would have been attributed to net loss to shareholders of the Parent Company is ￦ 15,349 million.

Approval Of Issuance Of The Con

Approval Of Issuance Of The Consolidated Financial Statements	12 Months Ended
	Dec. 31, 2020
Authorisation Of Financial Statements Abstract
Disclosure Of Authorisation Of Financial Statements Explanatory	45. Approval of Issuance of the Consolidated Financial Statements The Group’s consolidated financial statements as of and for the year ended December 31, 2020 was certified by management on April 27, 2021.

Parent Company Information

Parent Company Information	12 Months Ended
	Dec. 31, 2020
Condensed financial information of parent company only disclosure [Abstract]
Condensed Financial Information Of Parent Company Only Disclosure Text Block	46. Parent Company Information The following tables present the Parent Company Only financial information: Condensed Statements of Financial Position December 31, December 31, (In millions of Korean won) Assets Cash and due from financial institutions ￦ 18,537 ￦ 23,084 Financial assets at fair value through profit or loss 413,909 474,262 Loans at amortized cost 120,000 179,542 Investments in subsidiaries* Banking subsidiaries 14,821,721 14,821,721 Nonbanking subsidiaries. 9,340,395 11,698,159 Other assets 632,074 911,723 Total assets ￦ 25,346,636 ￦ 28,108,491 Liabilities and shareholders’ equity Borrowings ￦ — ￦ 100,000 Debentures 5,543,446 6,128,043 Other liabilities 621,291 894,828 Shareholders’ equity 19,181,899 20,985,620 Total liabilities and shareholders’ equity ￦ 25,346,636 ￦ 28,108,491 * Investments in subsidiaries were accounted at cost method in accordance with IAS No.27. Condensed Statements of Comprehensive Income 2018 2019 2020 (In millions of Korean won) Income Dividends from subsidiaries ￦ 1,089,556 ￦ 926,934 ￦ 1,573,411 Interest from subsidiaries 5,710 3,618 3,519 Other income 20,940 22,709 22,749 Total income 1,116,206 953,261 1,599,679 Expense Interest expense 122,451 126,065 132,437 Non-interest 65,027 80,355 87,876 Total expense 187,478 206,420 220,313 Profit before income tax expense 928,728 746,841 1,379,366 Income tax benefit (expense) (2,823 ) (854 ) 49 Profit for the year 925,905 745,987 1,379,415 Other comprehensive loss for the year, net of tax (1,911 ) (520 ) (368 ) Total comprehensive income for the year ￦ 923,994 ￦ 745,467 ￦ 1,379,047 * The condensed statements of comprehensive income for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS No.16, and the comparatives for the year ended December 31, 2018 has not been restated. Condensed Statements of Cash Flows 2018 2019 2020 (In millions of Korean won) Operating activities Net income ￦ 925,905 ￦ 745,987 ￦ 1,379,415 Reconciliation of net income (loss) to net cash provided by operating activities: Other operating activities, net (1,243 ) (274 ) 9,930 Net cash inflow from operating activities 924,662 745,713 1,389,345 Investing activities Net payments to subsidiaries — (100,000 ) (2,347,543 ) Other investing activities, net (43,554 ) (200,609 ) (146,477 ) Net cash outflow from investing activities (43,554 ) (300,609 ) (2,494,020 ) Financing activities Net decrease in borrowings (164 ) (298,321 ) 100,000 Increases in debentures 897,872 1,037,656 1,537,091 Repayments of debentures and lease liabilities (688,486 ) (868,723 ) (940,610 ) Issuance of hybrid securities — 399,085 1,296,693 Cash dividends paid (766,728 ) (766,249 ) (883,952 ) Acquisition of treasury shares (224,700 ) (274,317 ) — Net cash inflow (outflow) from financing activities (782,206 ) (770,869 ) 1,109,222 Net increase(decrease) in cash and cash equivalents 98,902 (325,765 ) 4,547 Cash and cash equivalents at January 1 245,397 344,299 18,534 Cash and cash equivalents at December 31 ￦ 344,299 ￦ 18,534 ￦ 23,081 * The condensed statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS No.16, and the comparatives for the year ended December 31, 2018 has not been restated.

Significant Accounting Polici_2

Significant Accounting Policies(Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies Abstract [Abstract]
Description Of Accounting Policy For Consolidation	3.1 Consolidation 3.1.1 Subsidiaries Subsidiaries are companies that are controlled by the Group. The Group controls an investee when it is exposed, or has rights, to variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Also, the existence and effects of potential voting rights that are currently exercisable or convertible are considered when assessing whether the Group controls the investee. Subsidiaries are fully consolidated from the date when control is transferred to the Group and de-consolidated If a subsidiary uses accounting policies other than those adopted in the consolidated financial statements for like transactions and events in similar circumstances, appropriate adjustments are made to that subsidiary’s financial statements in preparing the consolidated financial statements to ensure conformity with the Group’s accounting policies. Profit or loss and each component of other comprehensive income are attributed to the owners of the Parent Company and to the non-controlling non-controlling non-controlling Transactions with non-controlling non-controlling When the Group loses control, any investment retained in the former subsidiary is recognized at its fair value at the date when control is lost, with the resulting difference recognized in profit or loss. This fair value will be the fair value on initial recognition of a financial asset in accordance with IFRS No.9 or, when appropriate, the cost on initial recognition of an investment in an associate or joint venture. In addition, all amounts previously recognized in other comprehensive income in relation to that subsidiary are accounted on the same basis as would be required if the Group had directly disposed of the related assets or liabilities. Therefore, amounts previously recognized in other comprehensive income are reclassified to profit or loss. The Group accounts for each business combination by applying the acquisition method. The consideration transferred is measured at fair value, and identifiable assets acquired, and liabilities and contingent liabilities assumed in a business combination are initially measured at acquisition-date fair values. For each business combination, the Group measures non-controlling In a business combination achieved in stages, the Group shall remeasure its previously held equity interest in the acquiree at its acquisition-date fair value and recognize the resulting gain or loss, if any, in profit or loss or other comprehensive income, as appropriate. In prior reporting periods, the Group may have recognized changes in the value of its equity interest in the acquiree in other comprehensive income. If so, the amount that was recognized in other comprehensive income shall be reclassified as profit or loss, or retained earnings, on the same basis as would be required if the Group had disposed directly of the previously held equity interest. The Group applies the book amount method to account for business combinations of entities under a common control. Identifiable assets acquired and liabilities assumed in a business combination are measured at their book amounts on the consolidated financial statements of the Group. In addition, the difference between (a) the sum of consolidated net book amounts of the assets and liabilities transferred and accumulated other comprehensive income and (b) the consideration paid is recognized as capital surplus. 3.1.2 Associates and joint ventures Associates are entities over which the Group has significant influence over the financial and operating policy decisions. Generally, if the Group holds 20% or more of the voting power of the investee, it is presumed that the Group has significant influence. Joint ventures are investments in which the Group jointly controls over economic activities pursuant to contractual arrangement. Decisions about financial and operating policies require unanimous consent of the parties sharing control. Investments in associates and joint ventures are initially recognized at cost and equity method is applied after initial recognition. The carrying amount is increased or decreased to recognize the Group’s share of the profit or loss of the investee and changes in the investee’s equity after the date of acquisition. Distributions received from an investee reduce the carrying amount of the investment. Unrealized gains and losses resulting from transactions between the Group and associates are eliminated to the extent of the Group’s share in associates. If unrealized losses are indication of an impairment loss that which should be recognized in the consolidated financial statements, those losses are recognized for the period. If associates and joint ventures use accounting policies other than those of the Group for like transactions and events in similar circumstances, if necessary, adjustments shall be made to make the associates’ accounting policies conform to those of the Group when the associates’ financial statements are used by the Group in applying the equity method. If the Group’s share of losses of associates and joint ventures equals or exceeds its interest in the associates (including long-term interests that, in substance, form part of the Group’s net investment in the associate), the Group discontinues recognizing its share of further losses. After the Group’s interest is reduced to zero, additional losses are provided for, and a liability is recognized, only to the extent that the Group has incurred legal or constructive obligations or made payments on behalf of the associates. The Group determines at each reporting period whether there is any objective evidence that the investments in the associates are impaired. If this is the case, the Group calculates the amount of impairment as the difference between the recoverable amount of the associates and its carrying value and recognizes the amount as non-operating 3.1.3 Structured entity A structured entity is an entity that has been designed so that voting or similar rights are not the dominant factor in deciding who controls the entity. When the Group decides whether it has power over the structured entities in which the Group has interests, it considers factors such as the purpose, the form, the substantive ability to direct the relevant activities of a structured entity, the nature of its relationship with a structured entity and the amount of exposure to variable returns. 3.1.4 Funds management The Group manages and operates trust assets, collective investment and other funds on behalf of investors. These trusts and funds are not consolidated, except for trusts and funds over which the Group has control. 3.1.5 Intragroup transactions Intragroup balances, income, expenses and any unrealized gains and losses resulting from intragroup transactions are eliminated in full, in preparing the consolidated financial statements. If unrealized losses are indication of an impairment loss which should be recognized in the consolidated financial statements, those losses are recognized for the period.
Description Of Accounting Policy For Foreign Currency Translation Explanatory	3.2 Foreign Currency 3.2.1 Foreign currency transactions A foreign currency transaction is recorded, at initial recognition in the functional currency, by applying to the foreign currency amount the spot exchange rate between the functional currency and the foreign currency at the date of the transaction. At the end of each reporting period, foreign currency monetary items are translated using the closing rate which is the spot exchange rate at the end of the reporting period. Non-monetary non-monetary Except for the exchange difference for the net investment in a foreign operation and the financial liability designated as a hedging instrument of net investment, exchange differences arising on the settlement of monetary items or on translating monetary items is recognized in profit or loss. When gain or loss on a non-monetary non-monetary 3.2.2 Foreign operations The results and financial position of a foreign operation, whose functional currency differs from the Group’s presentation currency, are translated into the Group’s presentation currency based on the following procedures. If the functional currency of a foreign operation is not the currency of a hyperinflationary economy, assets and liabilities for each statement of financial position presented (including comparatives) are translated at the closing rate at the end of the reporting period, income and expenses for each statement of comprehensive income presented (including comparatives) are translated using the average exchange rates for the period. All resulting exchange differences are recognized in other comprehensive income. Any goodwill arising on the acquisition of a foreign operation and any fair value adjustments to the carrying amounts of assets and liabilities arising on the acquisition of that foreign operation are treated as assets and liabilities of the foreign operation. Thus, they are expressed in the functional currency of the foreign operation and are translated into the presentation currency at the closing rate. On the disposal of a foreign operation, the cumulative amount of the exchange differences relating to that foreign operation, recognized in other comprehensive income and accumulated in the separate component of equity, is reclassified from equity to profit or loss (as a reclassification adjustment) when the gain or loss on disposal is recognized. On the partial disposal of a subsidiary that includes a foreign operation, the Group re-attributes non-controlling 3.2.3 Translation of the net investment in a foreign operation A monetary item that is receivable from or payable to a foreign operation, for which settlement is neither planned nor likely to occur in the foreseeable future is, in substance, a part of the Group’s net investment in that foreign operation, then foreign currency difference arising from that monetary item is recognized in the other comprehensive income and shall be reclassified to profit or loss on disposal of the net investment.
Description Of Accounting Policy For Financial Instruments Explanatory	3.3 Recognition and Measurement of Financial Instruments 3.3.1 Initial recognition The Group recognizes a financial asset or a financial liability in its consolidated statement of financial position when the Group becomes party to the contractual provisions of the instrument. A regular way purchase or sale of financial assets (a purchase or sale of a financial asset under a contract whose terms require delivery of the asset within the time frame established generally by regulation or convention in the marketplace concerned) is recognized and derecognized using trade date accounting. For financial reporting purpose, the Group classifies (a) financial assets as financial assets at fair value through profit or loss, financial assets at fair value through other comprehensive income, or financial assets at amortized cost and (b) financial liabilities as financial liabilities at fair value through profit or loss, or other financial liabilities. These classifications are based on business model for managing financial instruments and the contractual cash flow characteristics of the financial instrument at initial recognition. At initial recognition, a financial asset or financial liability is measured at its fair value plus or minus, in the case of a financial asset or financial liability not at fair value through profit or loss, transaction costs that are directly attributable to the acquisition or issue of the financial asset or financial liability. The fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. The fair value of a financial instrument on initial recognition is normally the transaction price (that is, the fair value of the consideration given or received) in an arm’s length transaction. 3.3.2 Subsequent measurement After initial recognition, financial instruments are measured at amortized cost or fair value based on classification at initial recognition. 3.3.2.1 Amortized cost The amortized cost of a financial asset or financial liability is the amount at which the financial asset or financial liability is measured at initial recognition minus the principal repayments, plus or minus the cumulative amortization using the effective interest method of any difference between that initial amount and the maturity amount and, for financial assets, adjusted for any loss allowance. 3.3.2.2 Fair value The Group uses quoted price in active market which is based on listed market price or dealer price quotations of financial instruments traded in active market as best estimate of fair value. A financial instrument is regarded as quoted in an active market if quoted prices are readily and regularly available from an exchange, dealer, broker, industry group, pricing service or regulatory agency, and those prices represent actual and regularly occurring market transactions on an arm’s length basis. If there is no active market for a financial instrument, fair value is determined either by using a valuation technique or independent third-party valuation service. Valuation techniques include using recent arm’s length market transactions between knowledgeable and willing parties, if available, referencing to the current fair value of another instrument that is substantially the same, discounted cash flow analysis and option pricing models. The Group uses valuation models that are commonly used by market participants and customized for the Group to determine fair values of common over-the-counter In addition, the fair value information recognized in the consolidated statement of financial position is classified into the following fair value hierarchy, reflecting the significance of the input variables used in the fair value measurement. Level 1 : Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Group can access at the measurement date Level 2 : Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly Level 3 : Unobservable inputs for the asset or liability The fair value measurement is categorized in its entirety in the same level of the fair value hierarchy as the lowest level input that is significant to the entire measurement. For this purpose, the significance of an input is assessed against the fair value measurement in its entirety. If a fair value measurement uses observable inputs that require significant adjustment using unobservable inputs, that measurement is a Level 3 measurement. If the valuation technique does not reflect all factors which market participants would consider in pricing the asset or liability, the fair value is adjusted to reflect those factors. Those factors include counterparty credit risk, bid-ask The Group uses valuation technique which maximizes the use of market inputs and minimizes the use of entity-specific inputs. It incorporates all factors that market participants would consider in pricing the asset or liability and is consistent with economic methodologies applied for pricing financial instruments. Periodically, the Group calibrates the valuation technique and tests its validity using prices of observable current market transactions of the same instrument or based on other relevant observable market data. 3.3.3 Derecognition Derecognition is the removal of a previously recognized financial asset or financial liability from the consolidated statement of financial position. The derecognition criteria for financial assets and financial liabilities are as follows: 3.3.3.1 Derecognition of financial assets A financial asset is derecognized when the contractual rights to the cash flows from the financial assets expire or the Group transfers substantially all the risks and rewards of ownership of the financial asset, or the Group neither transfers nor retains substantially all the risks and rewards of ownership of the financial asset and the Group has not retained control. Therefore, if the Group does not transfer substantially all the risks and rewards of ownership of the financial asset, the Group continues to recognize the financial asset to the extent of its continuing involvement in the financial asset. If the Group transfers the contractual rights to receive the cash flows of the financial asset but retains substantially all the risks and rewards of ownership of the financial asset, the Group continues to recognize the transferred asset in its entirety and recognize a financial liability for the consideration received. The Group writes off a financial asset when the Group has no reasonable expectations of recovering a financial asset in its entirety or a portion thereof. In general, the Group considers write-off write-off write-off, written-off written-off 3.3.3.2 Derecognition of financial liabilities A financial liability is derecognized from the consolidated statement of financial position when it is extinguished (i.e. the obligation specified in the contract is discharged, canceled or expires). 3.3.4 Offsetting A financial asset and a financial liability is offset and the net amount is presented in the consolidated statement of financial position when, and only when, the Group currently has a legally enforceable right to set off the recognized amounts and intends either to settle on a net basis, or to realize the asset and settle the liability simultaneously. The legally enforceable right must not be contingent on a future event and must be legally enforceable in the normal course of business and in the event of default, insolvency or bankruptcy of the Group and all of the counterparties.
Description Of Accounting Policy For Cash and Due from Financial Institutions	3.4 Cash and Due from Financial Institutions Cash and due from financial institutions include cash on hand, foreign currency, and short-term, highly liquid investments that are readily convertible to known amounts of cash and which are subject to an insignificant risk of changes in value, and due from financial institutions. Cash and due from financial institutions are measured at amortized cost.
Description Of Accounting Policy For Non-derivative Financial Assets Explanatory	3.5 Non-derivative 3.5.1 Financial assets at fair value through profit or loss Financial assets are classified as financial assets at fair value through profit or loss unless they are classified as financial assets at amortized cost or at fair value through other comprehensive income. The Group may designate certain financial assets upon initial recognition as at fair value through profit or loss when the designation eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognizing the gains and losses on them on different bases. After initial recognition, a financial asset at fair value through profit or loss is measured at fair value and gains or losses arising from a change in fair value are recognized in profit or loss. Interest income using the effective interest method and dividend income from financial asset at fair value through profit or loss are also recognized in profit or loss. 3.5.2 Financial assets at fair value through other comprehensive income The Group classifies below financial assets as financial assets at fair value through other comprehensive income; • Debt instruments that are held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets, and where the assets’ cash flows represent solely payments of principal and interest on the principal amount outstanding and; • Equity instruments that are not held for short-term trading but held for strategic investment, and designated as financial assets at fair value through other comprehensive income After initial recognition, a financial asset at fair value through other comprehensive income is measured at fair value. Gains or losses arising from a change in fair value, other than dividend income, interest income calculated using the effective interest method and exchange differences arising on monetary items which are recognized directly in profit or loss, are recognized as other comprehensive income in equity. When the financial assets at fair value through other comprehensive income is disposed, the cumulative gain or loss previously recognized in other comprehensive income is reclassified from equity to profit or loss. However, cumulative gain or loss of equity instrument designated as fair value through other comprehensive income is reclassified to retained earnings not to profit or loss at disposal. A financial asset at fair value through other comprehensive income denominated in foreign currency is translated at the closing rate. Exchange difference resulting from change in amortized cost is recognized in profit or loss, and other changes are recognized in equity. 3.5.3 Financial assets at amortized cost A financial asset, which is held within the business model whose objective is achieved by collecting contractual cash flows, and where the assets’ cash flows represent solely payments of principal and interest on the principal amount outstanding, is classified as a financial asset at amortized cost. After initial recognition, a financial asset at amortized cost is measured at amortized cost using the effective interest method and interest income is calculated using the effective interest method.
Description Of Accounting Policy For Expected Credit Loss of Financial Assets Explanatory	3.6 Expected Credit Loss of Financial Assets (Debt Instruments) The Group recognizes a loss allowance for expected credit losses at the end of the reporting period for financial assets at amortized cost and fair value through other comprehensive income except for financial asset at fair value through profit or loss. Expected credit losses are estimated at present value of probability-weighted amount that is determined by evaluating a range of possible outcomes. The Group measures expected credit losses by reflecting all reasonable and supportable information that is available without undue cost or effort at the reporting date about past events, current conditions and forecasts of future economic conditions. The approaches of measuring expected credit losses in accordance with IFRS are as follows: • General approach: for financial assets and unused loan commitments not subject to the below 2 approaches • Simplified approach: for trade receivables, contract assets and lease receivables • Credit-impaired approach: for financial assets that are credit-impaired at the time of acquisition Application of general approach is differentiated depending on whether credit risk has increased significantly after initial recognition. If the credit risk on a financial instrument has not increased significantly since initial recognition, the Group measures the loss allowance for that financial instrument at an amount equal to 12-month The Group assesses whether the credit risk has increased significantly using the following information, and if one or more of the following conditions are met, it is deemed as significant increase in credit risk. Information of more than 30 days overdue is applied to all subsidiaries, and other information is applied selectively considering specific indicators of each subsidiary or additionally considering specific indicators of each subsidiary. If the contractual cash flows on a financial asset have been renegotiated or modified, the Group assesses whether the credit risk has increased significantly using the same following information. • More than 30 days past due • Decline in credit rating at period end by more than certain notches as compared to that at initial recognition • Subsequent managing ratings below certain level in the early warning system • Debt restructuring (except for impaired financial assets) and • Credit delinquency information of Korea Federation of Banks, etc. Under simplified approach, the Group always measures the loss allowance at an amount equal to lifetime expected credit losses. Under credit-impaired approach, the Group only recognizes the cumulative changes in lifetime expected credit losses since initial recognition as a loss allowance for purchased or originated credit-impaired financial assets. In assessing credit impairment, the Group uses definition of default as in the new Basel Accord which rules calculation of Capital Adequacy Ratio. The Group generally considers the loan to be credit-impaired if one or more of the following conditions are met: • 90 days or more past due • Legal proceedings related to collection • A borrower registered on the credit management list of Korea Federation of Banks • A corporate borrower with the credit rating C or D • Refinancing • Debt restructuring, etc. 3.6.1 Forward-looking information The Group uses forward-looking information, when it assesses whether the credit risk has increased significantly and measures the expected credit losses. The Group assumes the risk components have a certain correlation with the economic cycle and uses statistical methodologies to estimate the relation between key macroeconomic variables and risk components for the expected credit losses. The correlation between the major macroeconomic variables and the credit risk are as follows: Key macroeconomic variables Correlation between the major macroeconomic Domestic GDP growth rate (-) Composite stock index (-) Construction investment change rate (-) Rate of change in housing transaction price index (-) Interest rate spread (+) Private consumption growth rate (-) Change of call rate compared to the last year (%p) (+) Household loan change rate (-) Forward-looking information used in calculation of expected credit losses is based on the macroeconomic forecasts utilized by the management of the Group for its business plan considering reliable external agency’s forecasts and others. The forward-looking information is generated by KB Research with comprehensive approach to capture the possibility of various economic forecast scenarios that are derived from the internal and external viewpoints of the macroeconomic situation. The Group determines the macroeconomic variables to be used in forecasting future condition of the economy, considering the direction of the forecast scenario and the significant relationship between macroeconomic variables and time series data. And there are some changes compared to the macroeconomic variables used in the previous year. In order to reflect additional credit risk for financial assets whose industries are highly affected by COVID-19, 3.6.2 Measuring expected credit losses on financial assets at amortized cost The expected credit losses of financial assets at amortized cost are measured as present value of the difference between the contractual cash flows that are due to the Group under the contract and the cash flows that the Group expects to receive. The Group estimates expected future cash flows for financial assets that are individually significant. The Group selects the individually significant financial assets by comprehensively considering quantitative and qualitative factors (such as debt restructuring or negative net assets, etc.) among financial assets with the credit risk has increased significantly or credit-impaired(individual assessment of impairment). For financial assets that are not individually significant, the Group collectively estimates expected credit loss by grouping loans with homogeneous credit risk profile (collective assessment of impairment). 3.6.2.1 Individual assessment of impairment Individual assessment of impairment losses is calculated using management’s best estimate on present value of expected future cash flows. The Group uses all the available information including financial condition of the borrower such as operating cash flow and net realizable value of any collateral held. 3.6.2.2 Collective assessment of impairment Collective assessment of impairment losses is performed by using a methodology based on historical loss experience and reflecting forward-looking information. Such process incorporates factors such as type of collateral, product and borrowers, credit rating, size of portfolio and recovery period and applies Probability of Default (“PD”) on a group of assets and Loss Given Default (“LGD”) by type of recovery method. Also, the expected credit loss model involves certain assumptions to determine input based on loss experience and forward-looking information. These models and assumptions are periodically reviewed to reduce gap between loss estimate and actual loss experience. The lifetime expected credit loss is measured by applying the PD to the carrying amount calculated by deducting the expected principal repayment amount from the carrying amount as of the reporting date and the LGD adjusted to reflect changes in the carrying amount. 3.6.3 Measuring expected credit losses on financial assets at fair value through other comprehensive income The Group measures expected credit losses on financial assets at fair value through other comprehensive income in a manner that is consistent with the requirements that are applicable to financial assets measured at amortized cost. However, the loss allowance is recognized in other comprehensive income. Upon disposal or repayment of financial assets at fair value through other comprehensive income, the amount of the loss allowance is reclassified from other comprehensive income to profit or loss.
Description Of Accounting Policy For Derivative Financial Instruments Explanatory	3.7 Derivative Financial Instruments The Group enters into numerous derivative financial instrument contracts such as currency forwards, interest rate swaps, currency swaps and others for trading purposes or to manage its exposures to fluctuations in interest rates and currency exchange, amongst others. The Group’s derivative operations focus on addressing the needs of the Group’s corporate clients to hedge their risk exposure and to hedge the Group’s risk exposure that results from such client contracts. These derivative financial instruments are presented as derivative financial instruments in the consolidated financial statements irrespective of transaction purpose and subsequent measurement requirement. The Group designates certain derivatives as hedging instruments to hedge the risk of changes in fair value of a recognized asset or liability or of an unrecognized firm commitment (fair value hedge) and the risk of changes in cash flow (cash flow hedge). The Group designates certain derivatives and non-derivatives At the inception of the hedging relationship, there is formal designation and documentation of the hedging relationship and the Group’s risk management objective and strategy for undertaking the hedge. This documentation includes identification of the hedging instrument, the hedged item, the nature of the risk being hedged, the inception date of hedging relationship and how the Group will assess the hedging instrument’s effectiveness in offsetting the exposure to changes in the hedged item’s fair value or cash flows attributable to the hedged risk. Derivatives are initially recognized at fair value. After initial recognition, derivatives are measured at fair value, and changes therein are accounted for as described below. 3.7.1 Derivative financial instruments held for trading All derivative financial instruments, except for derivatives that are designated and qualify for hedge accounting, are measured at fair value. Gains or losses arising from changes in fair value are recognized in profit or loss as part of net gains or losses on financial instruments at fair value through profit or loss. 3.7.2 Derivative financial instruments for fair value hedges If derivatives are designated and qualify for a fair value hedge, changes in fair value of the hedging instrument and changes in fair value of the hedged item attributable to the hedged risk are recognized in profit or loss as part of other operating income and expenses. If the hedged items are equity instruments for which the Group has elected to present changes in fair value in other comprehensive income, changes in fair value of the hedging instrument and changes in fair value of the hedged item attributable to the hedged risk are recognized in other comprehensive income. Fair value hedge accounting is discontinued prospectively if the hedging instrument expires or is sold, terminated or exercised, or the hedging relationship ceases to meet the qualifying criteria. Once fair value hedge accounting is discontinued, the adjustment to the carrying amount of a hedged item is amortized to profit or loss by the maturity of the financial instrument using the effective interest method. 3.7.3 Derivative financial instruments for cash flow hedges The effective portion of changes in fair value of derivatives that are designated and qualify as cash flow hedges is recognized in other comprehensive income, limited to the cumulative change in fair value (present value) of the hedged item (the present value of the cumulative change in the hedged expected future cash flows) from inception of the hedge. The ineffective portion is recognized in profit or loss as other operating income or expense. The associated gains or losses that were previously recognized in other comprehensive income are reclassified from equity to profit or loss (other operating income or expense) as a reclassification adjustment in the same period or periods during which the hedged forecast cash flows affect profit or loss. Cash flow hedge accounting is discontinued prospectively if the hedging instrument expires or is sold, terminated or exercised, or the hedging relationship ceases to meet the qualifying criteria. When the cash flow hedge accounting is discontinued, the cumulative gains or losses on the hedging instrument that have been recognized in other comprehensive income are reclassified to profit or loss over the period in which the forecast transaction occurs. If the forecast transaction is no longer expected to occur, the cumulative gains or losses that have been recognized in other comprehensive income are immediately reclassified to profit or loss. 3.7.4 Derivative and non-derivative If derivatives and non-derivatives 3.7.5 Embedded derivatives An embedded derivative is separated from the host contract and accounted for as a derivative if, and only if, (a) the economic characteristics and risks of the embedded derivative are not closely related to those of the host contract, (b) a separate instrument with the same terms as the embedded derivative would meet the definition of a derivative and (c) the hybrid contract contains a host that is not a financial asset and is not designated as at fair value through profit or loss. Gains or losses arising from a change in fair value of an embedded derivative separated from the host contract are recognized in profit or loss as part of net gains or losses on financial instruments at fair value through profit or loss. 3.7.6 Day one gains or losses If the Group uses a valuation technique that incorporates unobservable inputs for the fair value of the OTC derivatives at initial recognition, there may be a difference between the transaction price and the amount determined using that valuation technique. In these circumstances, the difference is not recognized in profit or loss but deferred and amortized using the straight-line method over the life of the financial instrument. If the fair value is subsequently determined using observable inputs, the remaining deferred amount is recognized in profit or loss as part of net gains or losses on financial instruments at fair value through profit or loss or other operating income and expenses.
Description Of Accounting Policy For Property Plant And Equipment Explanatory	3.8 Property and Equipment 3.8.1 Recognition and measurement All property and equipment that qualify for recognition as an asset are measured at cost and subsequently carried at its cost less any accumulated depreciation and any accumulated impairment losses. The cost of property and equipment includes any costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management and the initial estimate of the costs of dismantling and removing the item and restoring the site on which it is located. Subsequent expenditures are capitalized only when they prolong the useful life or enhance values of the assets but the costs of the day-to-day 3.8.2 Depreciation Land is not depreciated, whereas other property and equipment are depreciated using the method that reflects the pattern in which the asset’s future economic benefits are expected to be consumed by the Group. The depreciable amount of an asset is determined after deducting its residual value. Each part of an item of property and equipment with a cost that is significant in relation to the total cost of the item is depreciated separately. The depreciation methods and estimated useful lives of property and equipment are as follows: Property and equipment Depreciation method Estimated useful lives Buildings Straight-line 20~40 years Leasehold improvements Declining-balance/ Straight-line 4~15 years Equipment and vehicles Declining-balance/ Straight-line 3~15 years The residual value, the useful life and the depreciation method applied to an asset are reviewed at each financial year-end
Description Of Accounting Policy For Investment Property Explanatory	3.9 Investment Properties 3.9.1 Recognition and measurement Properties held to earn rentals or for capital appreciation or both are classified as investment properties. Investment properties are measured initially at their cost and subsequently the cost model is used. 3.9.2 Depreciation Land is not depreciated, whereas other investment properties are depreciated using the method that reflects the pattern in which the asset’s future economic benefits are expected to be consumed by the Group. The depreciable amount of an asset is determined after deducting its residual value. The depreciation method and estimated useful lives of investment properties are as follows: Investment properties Depreciation method Estimated useful lives Buildings Straight-line 20~40 years The residual value, the useful life and the depreciation method applied to an asset are reviewed at each financial year-end
Description Of Accounting Policy For Intangible Assets And Goodwill Explanatory	3.10 Intangible Assets Intangible assets are measured initially at cost and subsequently carried at their cost less any accumulated amortization and any accumulated impairment losses. Intangible assets, except for goodwill and membership rights, are amortized using the straight-line method or declining-balance method with no residual value over their estimated useful economic life since the asset is available for use. Intangible assets Amortization method Estimated useful lives Industrial property rights Straight-line 3 ~ 19 years Software Straight-line 3 ~ 5 years VOBA Declining-balance 30, 60 years Others Straight-line / Declining-balance 1 ~ 13 years The amortization period and the amortization method for an intangible asset with a finite useful life are reviewed at least at each financial year-end. 3.10.1 Value of business acquired (“VOBA”) In case of acquisition of insurance company, the Group recognized the difference amount as VOBA in intangible assets, if the fair value of the acquired insurance liability is less than the carrying amount based on the acquiree’s accounting policy, and in the opposite case, the difference amount is recognized as negative VOBA and included in premium reserve. VOBA is an estimated present value of future cash flow of insurance contracts at the acquisition date. VOBA is amortized over the above estimated useful lives using declining balance method, and the depreciation is recognized as insurance expense. 3.10.2 Goodwill 3.10.2.1 Recognition and measurement Goodwill related to business combinations before January 1, 2010, is stated at its carrying amount, which was recognized under the Group’s previous accounting policy, prior to the transition to IFRS. Goodwill acquired from business combinations after January 1, 2010, is initially measured as the excess of cost of the business combination over the fair value of net identifiable assets acquired and liabilities assumed. If the fair value of net identifiable assets acquired and liabilities assumed exceeds cost of business combination, the difference is recognized in profit or loss. For each business combination, the Group decides at the acquisition date whether the non-controlling non-controlling Acquisition-related costs incurred to effect a business combination are charged to expenses in the periods in which the costs are incurred and the services are received, except for the costs to issue debt or equity securities. 3.10.2.2 Additional acquisitions of non-controlling Additional acquisitions of non-controlling 3.10.2.3 Subsequent measurement Goodwill is not amortized and is stated at cost less accumulated impairment losses. However, goodwill that forms part of the carrying amount of an investment in associates is not separately recognized and an impairment loss recognized is not allocated to any asset, including goodwill, which forms part of the carrying amount of the investment in the associates. 3.10.3 Subsequent expenditure Subsequent expenditure is capitalized only when it enhances values of the assets. Internally generated intangible assets, such as goodwill and trade name, are not recognized as assets but expensed as incurred.
Description Of Accounting Policy For Impairment Of Nonfinancial Assets Explanatory	3.11 Impairment of Non-financial The Group assesses at the end of each reporting period whether there is any indication that a non-financial (c) non-current The recoverable amount is estimated for the individual asset. If it is not possible to estimate the recoverable amount of the individual asset, the Group determines the recoverable amount of the cash-generating unit to which the asset belongs. A cash-generating unit is the smallest identifiable group of assets that generates cash inflows that are largely independent of the cash inflows from other assets or groups of assets. The recoverable amount of an asset is the higher of its fair value less costs to sell and its value in use. Value in use is the present value of the future cash flows expected to be derived from an asset or cash-generating unit that are discounted by a pre-tax If the recoverable amount of an asset is less than its carrying amount, the carrying amount of the asset is reduced to its recoverable amount. That reduction is an impairment loss and recognized immediately in profit or loss. For the purpose of impairment testing, goodwill acquired in a business combination is allocated to each of the cash-generating units that is expected to benefit from the synergies of the combination. The impairment loss is allocated first to reduce the carrying amount of any goodwill allocated to the cash-generating unit and then to the other assets of the unit pro rata on the basis of the carrying amount of each asset in the unit. An impairment loss recognized for goodwill is not reversed in a subsequent period. The Group assesses at the end of each reporting period whether there is any indication that an impairment loss recognized in prior periods for an asset, other than goodwill, may no longer exist or may have decreased, and an impairment loss recognized in prior periods for an asset other than goodwill shall be reversed if, and only if, there has been a change in the estimates used to determine the asset’s recoverable amount since the last impairment loss was recognized. The increased carrying amount of an asset other than goodwill attributable to a reversal of an impairment loss cannot exceed the carrying amount that would have been determined (net of amortization or depreciation) had no impairment loss been recognized for the asset in prior years.
Description Of Accounting Policy For Non-current Assets Held For Sale Explanatory	3.12 Non-current A non-current non-current A non-current Impairment loss is recognized for any initial or subsequent write-down of the asset (or disposal group) to fair value less costs to sell. Gain is recognized for any subsequent increase in fair value less costs to sell of an asset, but not in excess of the cumulative impairment loss that has been recognized.
Description Of Accounting Policy For Financial Liabilities	3.13 Financial Liabilities The Group classifies financial liabilities into financial liabilities at fair value through profit or loss or other financial liabilities in accordance with the substance of the contractual arrangement and the definitions of financial liabilities. The Group recognizes financial liabilities in the consolidated statement of financial position when the Group becomes a party to the contractual provisions of the financial liability. 3.13.1 Financial liabilities at fair value through profit or loss Financial liabilities at fair value through profit or loss include financial liabilities held for trading or designated as such at initial recognition. After initial recognition, financial liabilities at fair value through profit or loss are measured at fair value, and changes therein are recognized in profit or loss. At initial recognition, transaction costs that are directly attributable to the acquisition are recognized in profit or loss as incurred. In relation to securities lending or borrowing transactions, when the Group borrows securities from the Korea Securities Depository and others, these transactions are managed as off-balance In addition, the change in fair value of the financial liability that is attributable to change in the credit risk of that liability, the Group presents this change in other comprehensive income, and does not recycle this to profit or loss in accordance with IFRS No.9. However, if this treatment creates or enlarges an accounting mismatch, the Group recognizes this change in profit or loss. 3.13.2 Other financial liabilities Non-derivative In case an asset is sold under repurchase agreement, the Group continues to recognize the asset with the amount sold being accounted for as borrowing. The Group derecognizes a financial liability from the consolidated statement of financial position only when it is extinguished (i.e. when the obligation specified in the contract is discharged, canceled or expires).
Description Of Accounting Policy For Insurance Contracts	3.14 Insurance Contracts KB Insurance Co., Ltd., KB Life Insurance Co., Ltd. and Prudential Life Insurance Company of Korea Ltd., the subsidiaries of the Group, issue insurance contracts. Insurance contracts are defined as “a contract under which one party (the insurer) accepts significant insurance risk from another party by agreeing to compensate the policyholder if a specified uncertain future event adversely affects the policyholder”. A contract that qualifies as an insurance contract remains an insurance contract until all rights and obligations are extinguished or expire. Such a contract that does not contain significant insurance risk is classified as an investment contract and is within the scope of IFRS No.9 Financial Instruments Insurance Contracts 3.14.1 Insurance premiums The Group recognizes collected premiums as revenue on the due date of collection of premiums from insurance contracts and the collected premium which is not earned at the end of the reporting period is recognized as unearned premium. 3.14.2 Insurance liabilities The Group recognizes a liability for future claims, refunds, policyholders’ dividends and related expenses as follows: 3.14.2.1 Premium reserve Premium reserve refers to an amount based on the net premium method for payment of future claims with respect to events covered by insurance policies which have not yet occurred as of the reporting period. It is calculated as the greater of the amount using standard interest rate and standard loss ratio defined by Financial Supervisory Services and the amount using the actual underlying data that have been used in premium calculation. 3.14.2.2 Reserve for outstanding claims Reserve for outstanding claims refers to the amount not yet paid, out of an amount to be paid or expected to be paid with respect to the insured events which have arisen as of the end of each fiscal year. 3.14.2.3 Unearned premium reserve Reserve for the insurance premiums that are due during the reporting period but not earned at the end of the period. 3.14.2.4 Reserve for dividend to policyholders Reserve for dividend to policyholders including dividend of interest rate differential, rate of risk differential and business expenses differential is recognized for the purpose of provisioning for policyholders’ dividends in the future in accordance with statutes or insurance terms and conditions. 3.14.3 Liability adequacy test The Group conducts a liability adequacy test for all contracts to which IFRS No.4 Insurance Contracts Future cash flows from long-term insurance are discounted at interest rate scenario, which is risk-free rate scenario adjusted by liquidity premium, whereas future cash flows from general insurance are not discounted to present value. In case of insurance premium and unearned premium reserves, all future cash flows such as payment of claims, administration expenses and premium received from policyholders are considered for the liability adequacy test. And in case of reserve for outstanding claims, the adequacy of individually assessed payment of claims is tested by applying models that are considered appropriate for claim development trend among various statistical methods. 3.14.4 Deferred acquisition costs The Group recognizes acquisition cost incurred by the long-term insurance contract as an asset and amortizes it evenly over the premium payment period. If the premium payment period exceeds seven years, the amortization period shall be seven years. If the insurance contract is surrendered or lapsed due to payment overdue, the remaining balances of deferred acquisition cost are fully amortized in the period in which the contract is surrendered or lapsed.
Description Of Accounting Policy For Provisions Explanatory	3.15 Provisions Provisions are recognized when the Group has a present obligation (legal or constructive) as a result of a past event and it is probable that an outflow of resources embodying economic benefits will be required to settle the obligation and a reliable estimate can be made of the amount of the obligation. The risks and uncertainties that inevitably surround many events and circumstances are taken into account in reaching the best estimate of provisions, and where the effect of the time value of money is material, the amount of provisions is the present value of the expenditures expected to be required to settle the obligation. Provisions for confirmed and unconfirmed acceptances and guarantees, and unused credit lines of consumer and corporate loans are recognized using a valuation model that applies the credit conversion factor, probability of default, and loss given default. Provisions are reviewed at the end of each reporting period and adjusted to reflect the current best estimate. If it is no longer probable that an outflow of resources embodying economic benefits will be required to settle the obligation, the provisions are reversed. An onerous contract is a contract in which the unavoidable costs of meeting the obligations under the contract exceed the economic benefits expected to be received under it. The unavoidable costs under a contract reflect the least net cost of exiting from the contract, which is the lower of the cost of fulfilling it and any compensation or penalties arising from failure to fulfill it. If the Group has a contract that is onerous, the present obligation under the contract is recognized and measured as provisions.
Description Of Accounting Policy For Financial Guarantee Contracts Explanatory	3.16 Financial Guarantee Contracts A financial guarantee contract requires the issuer to make specified payments to reimburse the holder for a loss it incurs because a specified debtor fails to make payments when due in accordance with the original or modified terms of a debt instrument. Financial guarantee contracts are initially recognized at fair value and classified as other liabilities and are amortized over the contractual term. After initial recognition, financial guarantee contracts are measured at the higher of: • The amount determined in accordance with IFRS No.9 Financial Instruments • The amount initially recognized less, when appropriate, the cumulative amount of income recognized in accordance with IFRS No.15 Revenue from Contracts with Customers.
Description Of Accounting Policy For Equity Instrument Issued by the Group Explanatory	3.17 Equity Instrument Issued by the Group An equity instrument is any contract or agreement that evidences a residual interest in the assets of an entity after deducting all of its liabilities. 3.17.1 Ordinary shares Ordinary shares are classified as equity. Incremental costs directly attributable to the issue of new shares or the exercise of stock option are deducted from the equity, net of any tax effects. 3.17.2 Hybrid securities The financial instruments can be classified as either financial liabilities or equity in accordance with the terms of the contract. The Group classifies hybrid securities as an equity if the Group has the unconditional right to avoid any contractual obligation to deliver financial assets such as cash in relation to the financial instruments. However, hybrid securities issued by subsidiaries are classified as non-controlling non-controlling 3.17.3 Treasury shares If the Group acquires its own equity instruments, these are accounted for as treasury shares and are deducted directly from equity. No gains or losses are recognized in profit or loss on the purchase, sale, issue or retirement of own equity instruments. If an entity within the Group acquires and retains treasury shares, the consideration paid or received is directly recognized in equity. 3.17.4 Compound financial instruments A compound financial instrument is classified as a financial liability or an equity instrument depending on the substance of the contractual arrangement of such financial instrument. The liability component of the compound financial instrument is measured at fair value of the similar liability without conversion option at initial recognition and subsequently measured at amortized cost using effective interest method until it is extinguished by conversion or matured. Equity component is initially measured at fair value of compound financial instrument in its entirety less fair value of liability component net of tax effect and it is not remeasured subsequently.
Description Of Accounting Policy For Recognition Of Revenue	3.18 Revenue Recognition The Group recognizes revenues in accordance with the following steps determined in accordance with IFRS No.15 Revenue from Contracts with Customers • Step 1: Identify the contract with a customer. • Step 2: Identify the performance obligations in the contract. • Step 3: Determine the transaction price. • Step 4: Allocate the transaction price to the performance obligations in the contract. • Step 5: Recognize revenue when (or as) the entity satisfies a performance obligation. 3.18.1 Interest income and expense Interest income and expense on debt securities at fair value through profit or loss (excluding beneficiary certificates, equity investments and other debt instruments), loans, financial instruments at amortized cost and debt securities at fair value through other comprehensive income, are recognized in the consolidated statement of comprehensive income using the effective interest method in accordance with IFRS No.9 Financial Instruments The effective interest rate is the rate that exactly discounts estimated future cash receipts or payments through the expected life of the financial instrument or, where appropriate, a shorter period, to the gross carrying amount of a financial asset or to the amortized cost of a financial liability. When calculating the effective interest rate, the Group estimates expected cash flows by considering all contractual terms of the financial instrument but does not consider expected credit losses. The calculation includes all fees and points paid (main components of effective interest rate only) or received between parties to the contract that are an integral part of the effective interest rate, transaction costs, and all other premiums or discounts. In those rare cases when it is not possible to estimate reliably the cash flows and the expected life of a financial instrument, the Group uses the contractual cash flows over the full contractual term of the financial instrument. Interest income on impaired financial assets is recognized using the rate of interest used to discount the expected cash flows for the purpose of measuring the impairment loss. Interest income on debt securities at fair value through profit or loss is also classified as interest income in the consolidated statement of comprehensive income. 3.18.2 Fee and commission income The Group recognizes financial service fees in accordance with the purpose of charging the fees and the accounting standards of the financial instrument related to the fees earned. 3.18.2.1 Fees that are an integral part of the effective interest of a financial instrument Such fees are generally treated as adjustments of effective interest. Such fees may include compensation for activities such as evaluating the borrower’s financial condition, evaluating and recording guarantees, collateral and other security arrangements, negotiating the terms of the instrument, preparing and processing documents and closing the transaction and origination fees received on issuing financial liabilities at amortized cost. However, fees relating to the creation or acquisition of a financial instrument at fair value through profit or loss are recognized as revenue immediately. 3.18.2.2 Fees related to performance obligations satisfied over time The Group transfers control of a good or service over time, therefore, recognizes revenue related to performance obligations satisfied over the period of performance obligations. Fees which can be earned through the certain periods, including asset management fees, consignment business fees, etc. are recognized over the period of performance obligations. 3.18.2.3 Fees related to performance obligations satisfied at a point in time Fees earned at a point in time are recognized as revenue when a customer obtains controls of a promised good or service and the Group satisfies a performance obligation. Commission on negotiation or participation in negotiation for the third party such as trading stocks or other securities, arranging merger and acquisition of business, is recognized as revenue when the transaction has been completed. A syndication arrangement fees recognized as revenue when the syndication has been completed, if the Group arranges a loan and retains no part of the loan package for itself (or retains a part at the same effective interest rate for comparable risk as other participants). 3.18.3 Net gains or losses on financial instruments at fair value through profit or loss Net gains or losses on financial instruments at fair value through profit or loss (including changes in fair value, dividends, and gains or losses from foreign currency translation) include gains and losses from following financial instruments: • Gains or losses relating to financial instruments at fair value through profit or loss (excluding interest income using the effective interest rate) • Gains or losses relating to derivatives for trading (including derivatives for hedging purpose but do not qualify for hedge accounting) 3.18.4 Dividend income Dividend income is recognized in profit or loss when the right to receive payment is established. Dividend income is recognized as net gains or losses on financial instruments at fair value through profit or loss or other operating income depending on the classification of equity securities.
Description Of Accounting Policy For Employee Compensation and Benefits Explanatory	3.19 Employee Compensation and Benefits 3.19.1 Post-employment benefits: 3.19.1.1 Defined contribution plans When an employee has rendered service to the Group during a period, the Group recognizes the contribution payable to a defined contribution plan in exchange for that service as post-employment benefits for the period. 3.19.1.2 Defined benefit plans All post-employment benefits, other than defined contribution plans, are classified as defined benefit plans. The amount recognized as a net defined benefit liability is the present value of the defined benefit obligation less the fair value of plan assets at the end of the reporting period. The present value of the defined benefit obligation is calculated annually by independent actuaries using the Projected Unit Credit method. The rate used to discount post-employment benefit obligations is determined by reference to market yields at the end of the reporting period on high quality corporate bonds. The currency and term of the corporate bonds are consistent with the currency and estimated term of the post-employment benefit obligations. Actuarial gains and losses resulted from changes in actuarial assumptions and experience adjustments are recognized in other comprehensive income. When the total of the present value of the defined benefit obligation minus the fair value of plan assets results in an asset, it is recognized to the extent of the present value of any economic benefits available in the form of refunds from the plan or reductions in future contributions to the plan. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from the introduction or changes to a defined benefit plan. Such past service cost is immediately recognized as an expense for the period. 3.19.2 Short-term employee benefits Short-term employee benefits are employee benefits that are expected to be settled wholly before twelve months after the end of the annual reporting period in which the employees render the related service. When an employee has rendered service to the Group during an accounting period, the Group recognizes the undiscounted amount of short-term employee benefits expected to be paid in exchange for that service as an expense for the period. The expected cost of profit-sharing and bonus payments is recognized as liabilities when the Group has a present legal or constructive obligation to make payments as a result of past events, such as service rendered by employees, and a reliable estimate of the obligation can be made. 3.19.3 Share-based payment The Group has provided its directors and employees with stock grants, mileage stocks and long-term share-based payments programs. When stock grants are exercised, the Group can either select to distribute newly issued shares or treasury shares or compensate in cash based on the share price. When mileage stocks and long-term share-based payments are exercised, the Group pays the amount equivalent to share price of KB Financial Group Inc. in cash. For a share-based payment transaction in which the terms of the arrangement provide the Group with the choice of whether to settle in cash or by issuing equity instruments, the Group accounts for the transaction in accordance with the requirements applying to cash-settled share-based payment transactions because the Group determines that it has a present obligation to settle in cash because the Group has a past practice and a stated policy of settling in cash. Therefore, the Group measures the liability incurred as consideration for the service, at fair value and recognizes related expense and accrued expense over the vesting periods. For mileage stocks and long-term share-based payments program, the Group accounts for the transaction in accordance with the requirements applying to cash-settled share-based payment transactions, which are recognized as expense and accrued expenses at the time of vesting. Until the liability is settled, the Group remeasures the fair value of the liability at the end of each reporting period and at the date of settlement, with any changes in fair value recognized in profit or loss as share-based payments. 3.19.4 Termination benefits Termination benefits are payable when employment is terminated by the Group before the normal retirement date, or an employee’s decision to accept an offer of benefits in exchange for the termination of employment. The Group recognizes a liability and expense for termination benefits at the earlier of the following dates; when the Group can no longer withdraw the offer of those benefits and when the Group recognizes costs for a restructuring that is within the scope of IAS No.37 and involves the payment of termination benefits. If the termination benefits are not expected to be settled wholly before twelve months after the end of the annual reporting period, then the termination benefits are discounted to present value.
Description Of Accounting Policy For Income Tax Explanatory	3.20 Income Tax Expenses Income tax expense comprises current tax expense and deferred income tax expense. Current and deferred income tax are recognized as income or expense and included in profit or loss for the period, except to the extent that the tax arises from (a) a transaction or event which is recognized, in the same or a different period, outside profit or loss, either in other comprehensive income or directly in equity and (b) a business combination. 3.20.1 Current income tax Current income tax is the amount of income tax payable in respect of the taxable profit (loss) for the period. A difference between the taxable profit and accounting profit may arise when income or expense is included in accounting profit in one period but is included in taxable profit in a different period. Differences may also arise if there is revenue that is exempt from taxation, or expense that is not deductible in determining taxable profit (loss). Current income tax liabilities for the current and prior periods are measured using the tax rates that have been enacted or substantively enacted by the end of the reporting period. The Group offsets current income tax assets and current income tax liabilities if, and only if, the Group (a) has a legally enforceable right to set off the recognized amounts and (b) intends either to settle on a net basis, or to realize the asset and settle the liability simultaneously. 3.20.2 Deferred income tax Deferred income tax is recognized, using the asset-liability method, on temporary differences arising between the tax-based The Group recognizes a deferred tax liability for all taxable temporary differences associated with investments in subsidiaries, associates, and joint ventures, except to the extent that the Group is able to control the timing of the reversal of the temporary difference, and it is probable that the temporary difference will not reverse in the foreseeable future. The carrying amount of a deferred income tax asset is reviewed at the end of each reporting period. The Group reduces the carrying amount of a deferred income tax asset to the extent that it is no longer probable that sufficient taxable profit will be available to allow the benefit of part or all of that deferred income tax asset to be utilized. Deferred income tax assets and liabilities are measured at the tax rates that are expected to apply to the period when the asset is realized or the liability is settled, based on tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period. The measurement of deferred income tax liabilities and deferred income tax assets reflects the tax consequences that would follow from the manner in which the Group expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. The Group offsets deferred income tax assets and deferred income tax liabilities if, and only if the Group has a legally enforceable right to set off current income tax assets against current income tax liabilities and the deferred income tax assets and the deferred income tax liabilities relate to income taxes levied by the same taxation authority on either the same taxable entity or different taxable entities which intend either to settle current income tax liabilities and assets on a net basis, or to realize the assets and settle the liabilities simultaneously, in each future period in which significant amounts of deferred income tax liabilities or assets are expected to be settled or recovered. 3.20.3 Uncertain tax positions Uncertain tax positions arise from tax treatments applied by the Group which may be challenged by the tax authorities due to the complexity of the transaction or different interpretation of the tax laws, a claim for rectification brought by the Group, an appeal for a refund claimed from the tax authorities related to additional assessments or a tax investigation by the tax authorities. The Group recognizes its uncertain tax positions in the consolidated financial statements in accordance with IAS No.12 and IFRIC No.23. The income tax asset is recognized if a tax refund is probable for taxes paid and levied by the tax authority, and the amount to be paid as a result of the tax investigation and others is recognized as the current tax payable. However, additional dues on tax paid or refund are recognized in accordance with IAS No.37 because those are, in substance, interest and penalty.
Description Of Accounting Policy For Earnings Per Share Explanatory	3.21 Earnings per Share The Group calculates basic earnings per share amounts and diluted earnings per share amounts for profit or loss attributable to ordinary equity holders of the Parent Company and presents them in the consolidated statement of comprehensive income. Basic earnings per share is calculated by dividing profit or loss attributable to ordinary equity holders of the Parent Company by the weighted average number of ordinary shares outstanding during the period. For the purpose of calculating diluted earnings per share, the Group adjusts profit or loss attributable to ordinary equity holders of the Parent Company, and the weighted average number of shares outstanding, for the effects of all dilutive potential ordinary shares including convertible bonds and share options.
Description Of Accounting Policy For Leases Explanatory	3.22 Lease The Group as a lessor recognizes lease payments from operating leases as income on a straight-line basis over the lease term. Initial direct costs incurred in obtaining an operating lease are added to the carrying amount of the underlying asset and recognized as expense over the lease term on the same basis as lease income. The respective leased assets are included in the consolidated statement of financial position based on their nature. A lessee is required to recognize a right-of-use Lease liabilities include the net present value of the following lease payments: • Fixed payments (including in-substance • Variable lease payment that are depend on an index or a rate • Amounts expected to be payable by the lessee under residual value guarantees • The exercise price of a purchase option if the lessee is reasonably certain to exercise that option, and • Payments of penalties for terminating the lease, if the lease term reflects the lessee exercising an option to terminate the lease The lease payments are discounted using the interest rate implicit in the lease, if that rate can be readily determined. If that rate cannot be readily determined, the lessee’s incremental borrowing rate is used, which is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use Right-of-use • The amount of the initial measurement of the lease liability • Any lease payments made at or before the commencement date, less any lease incentives received • Any initial direct costs incurred by the lessee, and • An estimate of restoration costs However, the Group can elect not to apply the requirements of IFRS No.16 to short-term lease (lease that, at the commencement date, has a lease term of 12 months or less) and leases for which the underlying asset is of low value (for example, underlying leased asset under $ 5,000). The right-of-use right-of-use For sale and leaseback transactions, the Group applies the requirements of IFRS No.15 Revenue from Contracts with Customers
Description Of Accounting Policy For Operating Segment Reporting Explanatory	3.23 Operating Segments The Group identifies its operating segments based on internal reports which are regularly reviewed by the chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance. Segment information includes items which are directly attributable and reasonably allocated to the segment.
Description Of Accounting Policy For Overlay Approach Explanatory	3.24 Overlay Approach The Group applies the overlay approach in accordance with IFRS No.4 and a financial asset is eligible for designation for the overlay approach if, and only if, the following criteria are met: • It is measured at fair value through profit or loss applying IFRS No.9 but would not have been measured at fair value through profit or loss in its entirety applying IAS No.39 and • It is not held in respect of an activity that is unconnected with contracts within the scope of IFRS No.4. The Group reclassifies between profit or loss and other comprehensive income, and the amount reclassified is equal to the difference between: • The amount reported in profit or loss for the designated financial assets applying IFRS No.9 and • The amount that would have been reported in profit or loss for the designated financial assets if the insurer had applied IAS No.39. The Group is permitted to apply the overlay approach either at initial recognition or it may subsequently designate financial assets that newly meet criterion of not being held in respect of an activity that is unconnected with insurance contract, having previously not met that criterion. The Group continues to apply the overlay approach to a designated financial asset until that financial asset is derecognized. However, the Group de-designates At the beginning of any annual period, the Group may stop applying the overlay approach to all designated financial assets, and cannot subsequently apply the overlay approach, if it stops using this approach because it is no longer an insurer.
Description Of Accounting Policy For Functional Currency Explanatory	3.25 United States dollar amounts The Group operates primarily in Korea and its official accounting records are maintained in Korean won. The U.S. dollar amounts are provided herein as supplementary information solely for the convenience of the reader. Korean won amounts are expressed in U.S. dollars at the rate of ￦1,086.11 to U.S. $1.00, the U.S. Federal Reserve Bank of New York buying exchange rate in effect at noon, December 31, 2020. Such convenience translation into US dollars should not be construed as representations that the Korean won amounts have been, could have been, or could in the future be, converted at this or any other rate of exchange.

The Parent Company(Table)

The Parent Company(Table)	12 Months Ended
	Dec. 31, 2020
Entity Information Abstract [Abstract]
Disclosure Of Entity Information [Text Block]	The Parent Company’s share capital as of December 31, 2020, is ￦ 2,090,558 million. The Parent Company has been listed on the Korea Exchange (“KRX”) since October 10, 2008, and on the New York Stock Exchange (“NYSE”) for its American Depositary Shares (“ADS”) since September 29, 2008. Number of shares authorized in its Articles of Incorporation is 1,000 million.

Significant Accounting Polici_3

Significant Accounting Policies(Table)	12 Months Ended
	Dec. 31, 2020
Accounting Policies Abstract [Abstract]
Disclosure Of The Correlation Between The Major Macroeconomic Variables And The Credit Risk [Text Block]	The correlation between the major macroeconomic variables and the credit risk are as follows: Key macroeconomic variables Correlation between the major macroeconomic Domestic GDP growth rate (-) Composite stock index (-) Construction investment change rate (-) Rate of change in housing transaction price index (-) Interest rate spread (+) Private consumption growth rate (-) Change of call rate compared to the last year (%p) (+) Household loan change rate (-) Forward-looking information used in calculation of expected credit losses is based on the macroeconomic forecasts utilized by the management of the Group for its business plan considering reliable external agency’s forecasts and others. The forward-looking information is generated by KB Research with comprehensive approach to capture the possibility of various economic forecast scenarios that are derived from the internal and external viewpoints of the macroeconomic situation. The Group determines the macroeconomic variables to be used in forecasting future condition of the economy, considering the direction of the forecast scenario and the significant relationship between macroeconomic variables and time series data. And there are some changes compared to the macroeconomic variables used in the previous year.
Property Plant And Equipment Text Block [Text Block]	The depreciation methods and estimated useful lives of property and equipment are as follows: Property and equipment Depreciation method Estimated useful lives Buildings Straight-line 20~40 years Leasehold improvements Declining-balance/ Straight-line 4~15 years Equipment and vehicles Declining-balance/ Straight-line 3~15 years The residual value, the useful life and the depreciation method applied to an asset are reviewed at each financial year-end
Schedule Of Investment Property Table [Text Block]	The depreciation method and estimated useful lives of investment properties are as follows: Investment properties Depreciation method Estimated useful lives Buildings Straight-line 20~40 years The residual value, the useful life and the depreciation method applied to an asset are reviewed at each financial year-end
Schedule Of Finite Lived Intangible Assets Table Text Block [Text Block]	Intangible assets, except for goodwill and membership rights, are amortized using the straight-line method or declining-balance method with no residual value over their estimated useful economic life since the asset is available for use. Intangible assets Amortization method Estimated useful lives Industrial property rights Straight-line 3 ~ 19 years Software Straight-line 3 ~ 5 years VOBA Declining-balance 30, 60 years Others Straight-line / Declining-balance 1 ~ 13 years The amortization period and the amortization method for an intangible asset with a finite useful life are reviewed at least at each financial year-end.

Financial Risk Management(Table

Financial Risk Management(Table)	12 Months Ended
	Dec. 31, 2020
Finacial Risk Management Abstract [Abstract]
Disclosure of credit risk exposure [Text Block]	The Group’s maximum exposures of financial instruments other than equity securities, to credit risk without consideration of collateral values as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Financial assets Due from financial institutions measured at amortized cost * ￦ 18,142,960 ￦ 22,720,091 Financial assets at fair value through profit or loss Due from financial institutions measured at fair value through profit or loss 216,367 100,094 Securities measured at fair value through profit or loss 50,721,526 58,415,100 Loans measured at fair value through profit or loss 427,545 337,983 Financial instruments indexed to the price of gold 79,805 89,965 Derivatives 3,190,673 5,545,385 Loans measured at amortized cost * 339,684,059 377,166,984 Financial investments Securities measured at fair value through other comprehensive income 43,556,848 58,456,889 Securities measured at amortized cost * 25,346,555 36,870,229 Loans measured at fair value through other comprehensive income 375,098 293,409 Other financial assets * 9,147,059 14,167,689 490,888,495 574,163,818 Off-balance Acceptances and guarantees contracts 8,327,494 8,548,928 Financial guarantee contracts 3,847,390 4,964,468 Commitments 151,797,615 159,133,983 163,972,499 172,647,379 ￦ 654,860,994 ￦ 746,811,197 * After netting of allowance.
Disclosure Of The Credit Quality Of Loans [Text Block]	Credit qualities of loans as of December 31, 2019 and 2020, are as follows: December 31, 2019 12-month Lifetime expected credit losses Not applying Total Non-impaired Impaired (In millions of Korean won) Loans measured at amortized cost* Corporate Grade 1 ￦ 83,839,707 ￦ 2,621,898 ￦ 1,000 ￦ — ￦ 86,462,605 Grade 2 58,057,809 4,683,445 7,052 — 62,748,306 Grade 3 2,650,199 2,187,662 4,194 — 4,842,055 Grade 4 518,108 900,386 4,605 — 1,423,099 Grade 5 16,648 355,893 805,938 — 1,178,479 145,082,471 10,749,284 822,789 — 156,654,544 Retail Grade 1 146,265,744 3,611,001 8,155 — 149,884,900 Grade 2 7,081,846 4,433,832 29,304 — 11,544,982 Grade 3 2,080,690 1,541,647 11,366 — 3,633,703 Grade 4 185,081 387,811 9,722 — 582,614 Grade 5 10,180 587,448 545,295 — 1,142,923 155,623,541 10,561,739 603,842 — 166,789,122 Credit card Grade 1 8,390,177 96,052 — — 8,486,229 Grade 2 5,695,069 719,065 — — 6,414,134 Grade 3 1,558,999 1,161,396 — — 2,720,395 Grade 4 26,404 390,941 — — 417,345 Grade 5 350 135,630 474,327 — 610,307 15,670,999 2,503,084 474,327 — 18,648,410 316,377,011 23,814,107 1,900,958 — 342,092,076 Loans measured at fair value through other comprehensive income Corporate Grade 1 241,524 — — — 241,524 Grade 2 133,574 — — — 133,574 Grade 3 — — — — — Grade 4 — — — — — Grade 5 — — — — — 375,098 — — — 375,098 375,098 — — — 375,098 ￦ 316,752,109 ￦ 23,814,107 ￦ 1,900,958 ￦ — ￦ 342,467,174 December 31, 2020 12-month Lifetime expected credit losses Not applying Total Non-impaired Impaired (In millions of Korean won) Loans measured at amortized cost* Corporate Grade 1 ￦ 93,033,311 ￦ 4,646,801 ￦ 7,042 ￦ — ￦ 97,687,154 Grade 2 61,701,031 7,060,916 7,817 — 68,769,764 Grade 3 2,702,369 2,507,455 3,055 — 5,212,879 Grade 4 611,743 1,085,704 8,562 — 1,706,009 Grade 5 18,792 394,935 2,162,732 — 2,576,459 158,067,246 15,695,811 2,189,208 — 175,952,265 Retail Grade 1 163,261,012 3,536,290 6,789 — 166,804,091 Grade 2 8,828,445 4,197,409 34,896 — 13,060,750 Grade 3 2,519,004 1,322,878 9,012 — 3,850,894 Grade 4 225,262 402,881 8,352 — 636,495 Grade 5 39,466 636,361 672,397 — 1,348,224 174,873,189 10,095,819 731,446 — 185,700,454 Credit card Grade 1 8,210,540 412,555 — — 8,623,095 Grade 2 5,831,625 708,405 — — 6,540,030 Grade 3 1,526,382 1,216,434 — — 2,742,816 Grade 4 16,978 247,241 — — 264,219 Grade 5 2,101 118,907 506,462 — 627,470 15,587,626 2,703,542 506,462 — 18,797,630 348,528,061 28,495,172 3,427,116 — 380,450,349 Loans measured at fair value through other comprehensive income Corporate Grade 1 235,469 — — — 235,469 Grade 2 57,940 — — — 57,940 Grade 3 — — — — — Grade 4 — — — — — Grade 5 — — — — — 293,409 — — — 293,409 293,409 — — — 293,409 ￦ 348,821,470 ￦ 28,495,172 ￦ 3,427,116 ￦ — ￦ 380,743,758 * Before netting of allowance
Analysis Of Credit Exposures Using Internal Credit Grading System Explanatory	Credit qualities of loans graded according to internal credit ratings as of December 31, 2019 and 2020, are as follows: Range of Probability Retail Corporate Grade 1 0.0 ~ 1.0 1 ~ 5 grade AAA ~ BBB+ Grade 2 1.0 ~ 5.0 6 ~ 8 grade BBB ~ BB Grade 3 5.0 ~ 15.0 9 ~ 10 grade BB- Grade 4 15.0 ~ 30.0 11 grade B- Grade 5 30.0 ~ 12 grade or under CC or under
Disclosure Of The Quantification Of The Extent To Which Collateral And Other Credit Enhancements Mitigate Credit Risk For Loans [Text Block]	Quantification of the extent to which collateral and other credit enhancements mitigate credit risk of loans as of December 31, 2019 and 2020, are as follows: December 31, 2019 12-month Lifetime expected credit losses Total Non-impaired Impaired (In millions of Korean won) Guarantees ￦ 70,183,658 ￦ 3,839,736 ￦ 179,825 ￦ 74,203,219 Deposits and savings 4,478,032 118,221 8,034 4,604,287 Property and equipment 10,014,552 582,109 55,410 10,652,071 Real estate 155,769,901 10,839,595 417,815 167,027,311 ￦ 240,446,143 ￦ 15,379,661 ￦ 661,084 ￦ 256,486,888 December 31, 2020 12-month Lifetime expected credit losses Total Non-impaired Impaired (In millions of Korean won) Guarantees ￦ 79,088,720 ￦ 5,732,814 ￦ 187,512 ￦ 85,009,046 Deposits and savings 5,210,681 149,745 67,047 5,427,473 Property and equipment 11,607,675 808,476 120,471 12,536,622 Real estate 170,171,707 12,836,286 1,836,865 184,844,858 ￦ 266,078,783 ￦ 19,527,321 ￦ 2,211,895 ￦ 287,817,999
Disclosure Of The Credit Quality Of Securities Excluding Equity Securities [Text Block]	Credit qualities of securities other than equity securities that are exposed to credit risk as of December 31, 2019 and 2020, are as follows: December 31, 2019 12-month Lifetime expected credit Not applying Total Non-impaired Impaired (In millions of Korean won) Securities measured at amortized cost* Grade 1 ￦ 25,147,636 ￦ — ￦ — ￦ — ￦ 25,147,636 Grade 2 157,881 — — — 157,881 Grade 3 42,710 — — — 42,710 Grade 4 — — — — — Grade 5 — — — — — 25,348,227 — — — 25,348,227 Securities measured at fair value through other comprehensive income Grade 1 40,206,856 — — — 40,206,856 Grade 2 3,337,327 — — — 3,337,327 Grade 3 12,665 — — — 12,665 Grade 4 — — — — — Grade 5 — — — — — 43,556,848 — — — 43,556,848 ￦ 68,905,075 ￦ — ￦ — ￦ — ￦ 68,905,075 December 31, 2020 12-month Lifetime expected credit Not applying Total Non-impaired Impaired (In millions of Korean won) Securities measured at amortized cost* Grade 1 ￦ 36,467,719 ￦ — ￦ — ￦ — ￦ 36,467,719 Grade 2 359,551 — — — 359,551 Grade 3 38,847 7,061 — — 45,908 Grade 4 — — — — — Grade 5 — — — — — 36,866,117 7,061 — — 36,873,178 Securities measured at fair value through other comprehensive income Grade 1 54,576,777 — — — 54,576,777 Grade 2 3,746,200 — — — 3,746,200 Grade 3 126,391 — — — 126,391 Grade 4 7,521 — — — 7,521 Grade 5 — — — — — 58,456,889 — — — 58,456,889 ￦ 95,323,006 ￦ 7,061 ￦ — ￦ — ￦ 95,330,067 * Before netting of allowance
Analysis of credit exposures using external credit grading system [Text Block]	Credit qualities of securities other than equity securities, according to the credit ratings by external rating agencies as of December 31, 2019 and 2020, are as follows: Domestic Foreign Credit quality KIS NICE P&I KAP FnPricing Inc. S&P Fitch-IBCA Moody’s Grade 1 AA0 to AAA AA0 to AAA AA0 to AAA AA0 to AAA A- A- A3 to Aaa Grade 2 A- A- A- A- BBB- to BBB+ BBB- to BBB+ Baa3 to Baa1 Grade 3 BBB0 to BBB+ BBB0 to BBB+ BBB0 to BBB+ BBB0 to BBB+ BB to BB+ BB to BB+ Ba2 to Ba1 Grade 4 BB0 to BBB- BB0 to BBB- BB0 to BBB- BB0 to BBB- B+ to BB- B+ to BB- B1 to Ba3 Grade 5 BB- BB- or under BB- or under BB- or under B or under B or under B2 or under Credit qualities of debt securities denominated in Korean won are based on the lowest credit rating by the domestic agencies above, and those denominated in foreign currencies are based on the lowest credit rating by the foreign agencies above.
Disclosure Of The Credit Quality Of Due From Financial Institutions [Text Block]	Credit qualities of due from financial institutions as of December 31, 2019 and 2020, are as follows: December 31, 2019 12-month expected Lifetime expected credit losses Not applying Total Non-impaired Impaired (In millions of Korean won) Due from financial institutions measured at amortized cost* Grade 1 ￦ 17,292,966 ￦ — ￦ — ￦ — ￦ 17,292,966 Grade 2 149,927 — — — 149,927 Grade 3 677,249 — — — 677,249 Grade 4 — — — — — Grade 5 13,991 13,179 360 — 27,530 ￦ 18,134,133 ￦ 13,179 ￦ 360 ￦ — ￦ 18,147,672 December 31, 2020 12-month expected Lifetime expected credit losses Not applying Total Non-impaired Impaired (In millions of Korean won) Due from financial institutions measured at amortized cost* Grade 1 ￦ 21,437,207 ￦ — ￦ — ￦ — ￦ 21,437,207 Grade 2 334,371 — — — 334,371 Grade 3 445,732 13,099 — — 458,831 Grade 4 479,142 — — — 479,142 Grade 5 13,520 — 283 — 13,803 ￦ 22,709,972 ￦ 13,099 ￦ 283 ￦ — ￦ 22,723,354 * Before netting of allowance The classification criteria of the credit qualities of due from financial institutions as of December 31, 2019 and 2020, is the same as the criteria for securities other than equity securities.
Disclosure Of The Quantification Of The Extent To Which Collateral And Other Credit Enhancements Mitigate Credit Risk For Derivatives [Text Block]	The quantification of the extent to which collateral mitigates credit risk of derivative financial instruments as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Deposits, savings, securities, etc. ￦ 802,170 ￦ 1,651,322
Schedule Of Details Of Regional Loans [Text Block]	Details of loans by country as of December 31, 2019 and 2020, are as follows: December 31, 2019* Retail Corporate Credit card Total % Allowances Carrying (In millions of Korean won) Korea ￦ 166,310,457 ￦ 149,149,657 ￦ 18,642,111 ￦ 334,102,225 97.44 ￦ (2,363,332 ) ￦ 331,738,893 Europe — 1,118,429 — 1,118,429 0.33 (4,181 ) 1,114,248 China — 3,135,501 358 3,135,859 0.91 (20,654 ) 3,115,205 Japan 101 647,956 81 648,138 0.19 (576 ) 647,562 United States — 2,333,269 — 2,333,269 0.68 (9,205 ) 2,324,064 Others 478,564 1,072,375 5,860 1,556,799 0.45 (10,069 ) 1,546,730 ￦ 166,789,122 ￦ 157,457,187 ￦ 18,648,410 ￦ 342,894,719 100.00 ￦ (2,408,017 ) ￦ 340,486,702 December 31, 2020* Retail Corporate Credit card Total % Allowances Carrying (In millions of Korean won) Korea ￦ 182,344,832 ￦ 160,385,598 ￦ 18,734,570 ￦ 361,465,000 94.85 ￦ (2,433,702 ) ￦ 359,031,298 Europe — 2,042,979 — 2,042,979 0.54 (11,141 ) 2,031,838 China — 4,518,737 654 4,519,391 1.19 (20,489 ) 4,498,902 Japan 94 923,354 10 923,458 0.24 (1,249 ) 922,209 United States — 1,962,377 — 1,962,377 0.51 (21,489 ) 1,940,888 Cambodia 1,444,906 2,280,180 — 3,725,086 0.98 (89,652 ) 3,635,434 Indonesia 1,483,345 3,637,351 60,959 5,181,655 1.36 (699,947 ) 4,481,708 Others 427,276 833,080 1,437 1,261,793 0.33 (5,694 ) 1,256,099 ￦ 185,700,453 ￦ 176,583,656 ￦ 18,797,630 ￦ 381,081,739 100.00 ￦ (3,283,363 ) ￦ 377,798,376 * Amount includes loans measured at fair value through profit or loss, other comprehensive income and amortized cost.
Schedule Of Details Of Industrial Corporate Loans [Text Block]	Details of corporate loans by industry as of December 31, 2019 and 2020, are as follows: December 31, 2019 Loans % Allowances Carrying amount (In millions of Korean won) Financial institutions ￦ 16,405,404 10.42 ￦ (14,819 ) ￦ 16,390,585 Manufacturing 43,265,607 27.48 (394,428 ) 42,871,179 Service 65,277,701 41.46 (195,205 ) 65,082,496 Wholesale & Retail 18,593,540 11.81 (99,051 ) 18,494,489 Construction 3,679,798 2.34 (194,737 ) 3,485,061 Public sector 1,250,909 0.79 (2,084 ) 1,248,825 Others 8,984,228 5.70 (56,662 ) 8,927,566 ￦ 157,457,187 100.00 ￦ (956,986 ) ￦ 156,500,201 December 31, 2020 Loans % Allowances Carrying amount (In millions of Korean won) Financial institutions ￦ 16,044,243 9.09 ￦ (20,987 ) ￦ 16,023,256 Manufacturing 45,884,606 25.98 (473,360 ) 45,411,246 Service 76,001,877 43.04 (385,093 ) 75,616,784 Wholesale & Retail 23,129,457 13.10 (241,021 ) 22,888,436 Construction 4,397,814 2.49 (190,819 ) 4,206,995 Public sector 1,660,370 0.94 (74,839 ) 1,585,531 Others 9,465,289 5.36 (285,660 ) 9,179,629 ￦ 176,583,656 100.00 ￦ (1,671,779 ) ￦ 174,911,877
Schedule Of Types Of Retail And Credit Card Loans [Text Block]	Details of retail loans and credit card receivables as of December 31, 2019 and 2020, are as follows: December 31, 2019 Loans % Allowances Carrying amount (In millions of Korean won) Housing ￦ 78,102,637 42.12 ￦ (34,395 ) ￦ 78,068,242 General 88,686,485 47.83 (676,927 ) 88,009,558 Credit card 18,648,410 10.05 (739,709 ) 17,908,701 ￦ 185,437,532 100.00 ￦ (1,451,031 ) ￦ 183,986,501 December 31, 2020 Loans % Allowances Carrying amount (In millions of Korean won) Housing ￦ 87,312,052 42.70 ￦ (61,155 ) ￦ 87,250,897 General 98,388,401 48.11 (848,933 ) 97,539,468 Credit card 18,797,630 9.19 (701,496 ) 18,096,134 ￦ 204,498,083 100.00 ￦ (1,611,584 ) ￦ 202,886,499
Disclosure Of The Groups Credit Risk Industrial Concentration Of Due From Financial Institutions And Securities Excluding Equity Securities And Derivative [Text Block]	Details of credit risk of due from financial institutions, securities other than equity securities and derivative financial assets by industry as of December 31, 2019 and 2020, are as follows: December 31, 2019 Amount % Allowances Carrying amount (In millions of Korean won) Due from financial institutions measured at amortized cost Finance and insurance ￦ 18,147,672 100.00 ￦ (4,712 ) ￦ 18,142,960 18,147,672 100.00 (4,712 ) 18,142,960 Due from financial institutions measured at fair value through profit or loss Finance and insurance 216,367 100.00 — 216,367 216,367 100.00 — 216,367 Securities measured at fair value through profit or loss Government and government funded institutions 11,937,703 23.53 — 11,937,703 Finance and insurance 32,475,354 64.03 — 32,475,354 Others 6,308,469 12.44 — 6,308,469 50,721,526 100.00 — 50,721,526 Derivative financial assets Government and government funded institutions 7,330 0.23 — 7,330 Finance and insurance 3,003,371 94.13 — 3,003,371 Others 179,972 5.64 — 179,972 3,190,673 100.00 — 3,190,673 Securities measured at fair value through other comprehensive income Government and government funded institutions 16,744,232 38.44 — 16,744,232 Finance and insurance 21,439,272 49.22 — 21,439,272 Others 5,373,344 12.34 — 5,373,344 43,556,848 100.00 — 43,556,848 Securities measured at amortized cost Government and government funded institutions 11,115,435 43.86 (37 ) 11,115,398 Finance and insurance 12,279,883 48.44 (1,349 ) 12,278,534 Others 1,952,909 7.70 (286 ) 1,952,623 25,348,227 100.00 (1,672 ) 25,346,555 ￦ 141,181,313 ￦ (6,384 ) ￦ 141,174,929 December 31, 2020 Amount % Allowances Carrying amount (In millions of Korean won) Due from financial institutions measured at amortized cost Finance and insurance ￦ 22,723,354 100.00 ￦ (3,263 ) ￦ 22,720,091 22,723,354 100.00 (3,263 ) 22,720,091 Due from financial institutions measured at fair value through profit or loss Finance and insurance 100,094 100.00 — 100,094 100,094 100.00 — 100,094 Securities measured at fair value through profit or loss Government and government funded institutions 16,902,284 28.94 — 16,902,284 Finance and insurance 34,244,398 58.62 — 34,244,398 Others 7,268,418 12.44 — 7,268,418 58,415,100 100.00 — 58,415,100 Derivative financial assets Government and government funded institutions 44,670 0.81 — 44,670 Finance and insurance 4,925,535 88.82 — 4,925,535 Others 575,180 10.37 — 575,180 5,545,385 100.00 — 5,545,385 Securities measured at fair value through other comprehensive income Government and government funded institutions 26,205,864 44.83 — 26,205,864 Finance and insurance 24,847,602 42.51 — 24,847,602 Others 7,403,423 12.66 — 7,403,423 58,456,889 100.00 — 58,456,889 Securities measured at amortized cost Government and government funded institutions 24,018,884 65.14 (30 ) 24,018,854 Finance and insurance 11,019,911 29.89 (2,475 ) 11,017,436 Others 1,834,383 4.97 (445 ) 1,833,938 36,873,178 100.00 (2,950 ) 36,870,228 ￦ 182,114,000 ￦ (6,213 ) ￦ 182,107,787
Disclosure Of The Groups Credit Risk Regional Concentration Of Due From Financial Institutions And Securities Excluding Equity Securities And Derivative [Text Block]	Details of credit risk of due from financial institutions, securities other than equity securities and derivative financial assets by country as of December 31, 2019 and 2020, are as follows: December 31, 2019 Amount % Allowances Carrying amount (In millions of Korean won) Due from financial institutions measured at amortized cost Korea ￦ 13,864,687 76.40 ￦ (555 ) ￦ 13,864,132 United States 1,318,582 7.27 (1 ) 1,318,581 Others 2,964,403 16.33 (4,156 ) 2,960,247 18,147,672 100.00 (4,712 ) 18,142,960 Due from financial institutions measured at fair value through profit or loss Korea 216,367 100.00 — 216,367 216,367 100.00 — 216,367 Securities measured at fair value through profit or loss Korea 46,413,061 91.51 — 46,413,061 United States 1,939,330 3.82 — 1,939,330 Others 2,369,135 4.67 — 2,369,135 50,721,526 100.00 — 50,721,526 Derivative financial assets Korea 1,440,349 45.14 — 1,440,349 United States 529,956 16.61 — 529,956 France 358,951 11.25 — 358,951 Others 861,417 27.00 — 861,417 3,190,673 100.00 — 3,190,673 Securities measured at fair value through other comprehensive income Korea 40,948,853 94.01 — 40,948,853 United States 687,243 1.58 — 687,243 Others 1,920,752 4.41 — 1,920,752 43,556,848 100.00 — 43,556,848 Securities measured at amortized cost Korea 22,591,541 89.12 (1,034 ) 22,590,507 United States 1,312,941 5.18 (217 ) 1,312,724 Others 1,443,745 5.70 (421 ) 1,443,324 25,348,227 100.00 (1,672 ) 25,346,555 ￦ 141,181,313 ￦ (6,384 ) ￦ 141,174,929 December 31, 2020 Amount % Allowances Carrying amount (In millions of Korean won) Due from financial institutions measured at amortized cost Korea ￦ 16,535,849 72.78 ￦ (607) ￦ 16,535,242 United States 2,030,614 8.94 (283 ) 2,030,331 Others 4,156,891 18.28 (2,373 ) 4,154,518 22,723,354 100.00 (3,263 ) 22,720,091 Due from financial institutions measured at fair value through profit or loss Korea 100,094 100.00 — 100,094 100,094 100.00 — 100,094 Securities measured at fair value through profit or loss Korea 53,991,978 92.43 — 53,991,978 United States 2,370,538 4.06 — 2,370,538 Others 2,052,584 3.51 — 2,052,584 58,415,100 100.00 — 58,415,100 Derivative financial assets Korea 2,885,214 52.03 — 2,885,214 United States 706,866 12.75 — 706,866 Others 1,953,305 35.22 — 1,953,305 5,545,385 100.00 — 5,545,385 Securities measured at fair value through other comprehensive income Korea 54,786,461 93.72 — 54,786,461 United States 942,151 1.61 — 942,151 Others 2,728,277 4.67 — 2,728,277 58,456,889 100.00 — 58,456,889 Securities measured at amortized cost Korea 34,545,872 93.69 (2,283 ) 34,543,589 United States 1,049,387 2.85 (241 ) 1,049,146 Others 1,277,919 3.46 (426 ) 1,277,493 36,873,178 100.00 (2,950 ) 36,870,228 ￦ 182,114,000 ￦ (6,213 ) ￦ 182,107,787 Due from financial institutions and financial instruments at fair value through profit or loss that are linked to gold price and derivatives are mostly related to finance and insurance industry with high credit ratings.
Disclosure Of The Remaining Contractual Maturity Of Financial Assets And Liabilities Excluding Derivatives Held For Cash Flow Hedging [Text Block]	Remaining contractual maturity of financial assets and liabilities other than derivatives held for cash flow hedge as of December 31, 2019 and 2020, are as follows: December 31, 2019 On Up to 1-3 3-12 1-5 Over 5 Total (In millions of Korean won) Financial assets Cash and due from financial institutions 1 ￦ 5,323,332 ￦ 1,038,805 ￦ 286,091 ￦ 822,123 ￦ 18,628 ￦ — ￦ 7,488,979 Financial assets at fair value through profit or loss 52,488,545 446,069 273,144 187,821 236,130 1,011,289 54,642,998 Derivatives held for trading 2 3,008,598 — — — — — 3,008,598 Derivatives held for hedging 3 — 4,892 20,216 37,441 41,401 66,176 170,126 Loans measured at amortized cost 2,908,095 33,042,040 32,668,128 125,125,270 94,802,566 96,757,198 385,303,297 Financial investments 4 Financial assets at fair value through other comprehensive income 2,101,605 526,465 1,403,884 6,761,533 33,604,010 4,506,581 48,904,078 Securities measured at amortized cost — 1,002,164 2,080,834 5,700,500 7,366,945 15,888,344 32,038,787 Other financial assets 71,528 6,578,005 179,790 1,373,850 40,243 35,927 8,279,343 ￦ 65,901,703 ￦ 42,638,440 ￦ 36,912,087 ￦ 140,008,538 ￦ 136,109,923 ￦ 118,265,515 ￦ 539,836,206 December 31, 2019 On Up to 1-3 3-12 1-5 Over 5 Total (In millions of Korean won) Financial liabilities Financial liabilities at fair value through profit or loss 2 ￦ 2,663,327 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 2,663,327 Financial liabilities designated at fair value through profit or loss 2 12,704,826 — — — — — 12,704,826 Derivatives held for trading 2 2,842,950 — — — — — 2,842,950 Derivatives held for hedging 3 — 14,764 15,588 1,652 20,044 129 52,177 Deposits 5 141,821,986 17,180,492 27,300,542 110,410,809 10,804,440 2,354,504 309,872,773 Borrowings 7,074,508 12,341,516 3,057,980 8,994,817 4,950,294 1,763,234 38,182,349 Debentures 22,285 2,652,730 3,812,476 11,062,873 32,477,672 3,515,716 53,543,752 Lease liabilities 256 19,304 35,730 137,419 318,781 66,032 577,522 Other financial liabilities 114,320 17,663,385 187,976 212,059 693,921 119,637 18,991,298 ￦ 167,244,458 ￦ 49,872,191 ￦ 34,410,292 ￦ 130,819,629 ￦ 49,265,152 ￦ 7,819,252 ￦ 439,430,974 Off-balance Commitments 6 ￦ 151,797,615 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 151,797,615 Financial guarantee contracts 7 3,847,390 — — — — — 3,847,390 ￦ 155,645,005 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 155,645,005 December 31, 2020 On Up to 1-3 3-12 1-5 Over 5 Total (In millions of Korean won) Financial assets Cash and due from financial institutions 1 ￦ 7,186,004 ￦ 1,449,949 ￦ 469,858 ￦ 1,217,217 ￦ 35,056 ￦ — ￦ 10,358,084 Financial assets at fair value through profit or loss 60,520,103 242,664 83,408 25,658 142,547 561,959 61,576,339 Derivatives held for trading 2 5,210,512 — — — — — 5,210,512 Derivatives held for hedging 3 — 9,371 32,816 74,364 70,863 88,462 275,876 Loans measured at amortized cost 3,126,366 29,240,531 35,862,097 135,526,320 116,211,931 103,685,410 423,652,655 Financial investments 4 Financial assets at fair value through other comprehensive income 2,532,279 896,523 1,556,600 10,523,465 35,347,644 16,949,942 67,806,453 Securities measured at amortized cost — 1,003,104 2,724,223 2,567,726 9,658,717 29,923,188 45,876,958 Other financial assets 89,855 11,514,303 206,227 1,273,876 73,735 48,019 13,206,015 ￦ 78,665,119 ￦ 44,356,445 ￦ 40,935,229 ￦ 151,208,626 ￦ 161,540,493 ￦ 151,256,980 ￦ 627,962,892 December 31, 2020 On Up to 1-3 3-12 1-5 Over 5 Total (In millions of Korean won) Financial liabilities Financial liabilities at fair value through profit or loss 2 ￦ 2,025,952 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 2,025,952 Financial liabilities designated at fair value through profit or loss 2 9,784,107 — — — — — 9,784,107 Derivatives held for trading 2 5,014,072 — — — — — 5,014,072 Derivatives held for hedging 3 — 3,123 4,120 62,147 35,198 109 104,697 Deposits 5 182,111,594 17,207,360 28,485,765 99,879,946 12,133,364 1,664,509 341,482,538 Borrowings 9,333,894 17,730,230 4,923,897 9,617,100 7,616,809 938,374 50,160,304 Debentures 18,105 2,806,105 6,769,859 14,330,686 35,512,544 6,241,226 65,678,525 Lease liabilities 205 22,372 40,376 152,084 332,033 44,882 591,952 Other financial liabilities 217,866 24,153,880 208,745 329,291 748,593 215,447 25,873,822 ￦ 208,505,795 ￦ 61,923,070 ￦ 40,432,762 ￦ 124,371,254 ￦ 56,378,541 ￦ 9,104,547 ￦ 500,715,969 Off-balance Commitments 6 ￦ 159,133,983 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 159,133,983 Acceptances and guarantees contracts 8,548,928 — — — — — 8,548,928 Financial guarantee contracts 7 4,964,468 — — — — — 4,964,468 ￦ 172,647,379 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 172,647,379 1 Restricted due from financial instruments amounting to ￦ 13,394,627 million and ￦ 15,331,515 million are excluded as of December 31, 2019 and 2020, respectively. 2 Financial liabilities measured or designated at fair value through profit or loss and derivatives held for trading are not managed by contractual maturity because they are expected to be traded or redeemed before maturity. Therefore, the carrying amounts of those financial instruments are included in the ‘On demand’ category. 3 Cash flows of derivative instruments held for hedging are shown at net amounts of cash inflows and outflows by remaining contractual maturity. 4 Equity securities designated as financial assets at fair value through other comprehensive income are included in the ‘On demand’ category because most are available for sale at any time. However, equity securities restricted from sale, are included in the category corresponding to the date on which the restriction is lifted. 5 Deposits that are contractually repayable on demand or on short notice are included in the ‘On demand’ category. 6 Commitments are included in the ‘On demand’ category because payments can be requested at any time. 7 Cash flows under financial guarantee contracts are classified based on the earliest period that the contract can be executed.
Disclosure Of The Contractual Cash Flows Of Derivatives Held For Cash Flow Hedging [Text Block]	Contractual cash flows of derivatives held for cash flow hedge as of December 31, 2019 and 2020, are as follows: December 31, 2019 Up to 1-3 3-12 1-5 Over 5 years Total (In millions of Korean won) Cash flow to be received (paid) of net-settled ￦ (639 ) ￦ (1,831 ) ￦ (5,021 ) ￦ (10,602 ) ￦ 1,084 ￦ (17,009 ) Cash flow to be received of gross-settled derivatives 14,119 200,170 657,909 1,888,772 — 2,760,970 Cash flow to be paid of gross-settled derivatives (18,171 ) (199,141 ) (671,375 ) (1,955,650 ) — (2,844,337 ) December 31, 2020 Up to 1 1-3 3-12 1-5 Over 5 years Total (In millions of Korean won) Cash flow to be received (paid) of net-settled ￦ (1,082) ￦ (5,569) ￦ (15,132) ￦ (25,354) ￦ 290 ￦ (46,847) Cash flow to be received of gross-settled derivatives 85,064 220,339 517,929 2,289,277 — 3,112,609 Cash flow to be paid of gross-settled derivatives (88,952 ) (221,261 ) (523,442 ) (1,616,530 ) — (2,450,185 )
Disclosure Of Value At Risk By Subsidiary [Text Block]	Ten-day Kookmin Bank 2019 Average Minimum Maximum Dec. 31 2019 (In millions of Korean won) Interest rate risk ￦ 11,190 ￦ 1,725 ￦ 20,467 ￦ 16,628 Stock price risk 3,434 2,402 4,310 3,914 Foreign exchange rate risk 15,760 11,416 20,704 13,081 Deduction of diversification effect (13,246 ) Total VaR ￦ 17,545 ￦ 13,641 ￦ 24,849 ￦ 20,377 2020 Average Minimum Maximum Dec. 31 2020 (In millions of Korean won) Interest rate risk ￦ 59,147 ￦ 9,588 ￦ 105,983 ￦ 50,795 Stock price risk 15,379 3,787 24,821 24,821 Foreign exchange rate risk 36,281 5,302 67,766 49,338 Deduction of diversification effect (7,320 ) Total VaR ￦ 105,428 ￦ 14,225 ￦ 158,798 ￦ 117,634 KB Securities Co., Ltd. 2019 Average Minimum Maximum Dec. 31, 2019 (In millions of Korean won) Interest rate risk ￦ 520,681 ￦ 460,539 ￦ 563,991 ￦ 563,991 Stock price risk 248,183 217,149 282,584 270,443 Foreign exchange rate risk 15,785 7,578 23,674 21,418 Commodity risk 3 1 20 1 ￦ 784,652 ￦ 685,267 ￦ 870,269 ￦ 855,853 2020 Average Minimum Maximum Dec. 31, 2020 (In millions of Korean won) Interest rate risk ￦ 656,651 ￦ 575,053 ￦ 755,704 ￦ 755,704 Stock price risk 267,186 213,639 317,478 213,639 Foreign exchange rate risk 15,113 8,759 21,907 10,588 Commodity risk 18 1 56 18 ￦ 938,968 ￦ 797,452 ￦ 1,095,145 ￦ 979,949 KB Insurance Co., Ltd. 2019 Average Minimum Maximum Dec. 31, 2019 (In millions of Korean won) Interest rate risk ￦ 3,418 ￦ 2,201 ￦ 4,904 ￦ 3,252 Foreign exchange rate risk 23,293 16,153 27,550 26,140 ￦ 26,711 ￦ 18,354 ￦ 32,454 ￦ 29,392 2020 Average Minimum Maximum Dec. 31, 2020 (In millions of Korean won) Interest rate risk ￦5,682 ￦ 2,850 ￦ 7,652 ￦ 7,055 Foreign exchange rate risk 26,529 23,491 29,339 28,891 ￦ 32,211 ￦ 26,341 ￦ 36,991 ￦ 35,946 KB Kookmin Card Co., Ltd. 2020 Average Minimum Maximum Dec. 31, 2020 (In millions of Korean won) Foreign exchange rate risk ￦ 2,712 ￦ 169 ￦ 7,861 ￦ 7,546 Prudential Life Insurance Company of Korea Ltd. 2020 Average Minimum Maximum Dec. 31, 2020 (In millions of Korean won) Foreign exchange rate risk ￦ 7,977 ￦ 7,977 ￦ 7,977 ￦ 7,977 KB Asset Management Co., Ltd. 2019 Average Minimum Maximum Dec. 31, 2019 (In millions of Korean won) Interest rate risk ￦ 417 ￦ 202 ￦ 1,238 ￦ 509 Stock price risk 3,456 1,965 6,248 6,248 Foreign exchange rate risk 825 362 1,427 362 ￦ 4,698 ￦ 2,529 ￦ 8,913 ￦ 7,119 2020 Average Minimum Maximum Dec. 31, 2020 (In millions of Korean won) Interest rate risk ￦ 1,298 ￦ — ￦ 2,589 ￦ — Stock price risk 3,382 — 9,484 — Foreign exchange rate risk 812 1,208 1,523 1,141 ￦ 5,492 ￦ 1,208 ￦ 13,596 ￦ 1,141 KB Capital Co., Ltd. 2020 Average Minimum Maximum Dec. 31, 2020 (In millions of Korean won) Foreign exchange rate risk ￦ 810 ￦ 297 ￦ 1,315 ￦ 896 KB Life Insurance Co., Ltd. 2019 Average Minimum Maximum Dec. 31, 2019 (In millions of Korean won) Interest rate risk ￦ 2,630 ￦ 1,295 ￦ 3,597 ￦ 2,038 2020 Average Minimum Maximum Dec. 31, 2020 (In millions of Korean won) Interest rate risk ￦ 3,054 ￦ 1,784 ￦ 4,389 ￦ 2,743 KB Real Estate Trust Co., Ltd. 2020 Average Minimum Maximum Dec. 31, 2020 (In millions of Korean won) Stock price risk ￦ 399 ￦ — ￦ 435 ￦ — KB Investment Co., Ltd. 2019 Average Minimum Maximum Dec. 31, 2019 (In millions of Korean won) Stock price risk ￦ — ￦ — ￦ — ￦ — Foreign exchange rate risk 7,452 4,072 10,480 9,988 ￦ 7,452 ￦ 4,072 ￦ 10,480 ￦ 9,988 2020 Average Minimum Maximum Dec. 31, 2020 (In millions of Korean won) Stock price risk ￦ 1,153 ￦ — ￦ 7,588 ￦ 6,253 Foreign exchange rate risk 11,864 10,167 12,625 11,655 ￦ 13,017 ￦ 10,167 ￦ 20,213 ￦ 17,908
Schedule Of Required Equity Capital Using The Standardized Method Related To The Positions Which Are Not Measured By VaR Or The Non Banking Subsidiaries [Text Block]	Kookmin Bank December 31, 2019 December 31, 2020 (In millions of Korean won) Interest rate risk ￦ 83,731 ￦ 40,290 Stock price risk 1,954 7,088 Foreign exchange rate risk 1,850 23,938 ￦ 87,535 ￦ 71,316
Disclosure of Changes in equity value and net interest income of Kookmin Bank by scenario	Definition of non-trading Interest rate risk management targets for non-trading on-balance off-balance Observation method of market risk arising from non-trading As a qualitative methodology, interest rate risk is a change in equity and profit due to the changes in value of interest-sensitive assets, liabilities, etc., and is measured by D D Interest rate risk levels (a) Subsidiary Kookmin Bank Kookmin Bank calculates D D December 31, 2019 Changes in the Economic D EVE) Changes in net interest D NII) (In millions of Korean won) Scenario 1 (Parallel rise) ￦ 483,207 ￦ 152,013 Scenario 2 (Parallel decline) 31,718 9,717 Scenario 3 (Short-term decline, long-term rise) 257,756 Scenario 4 (Short-term rise, long-term decline) 411,237 Scenario 5 (Short-term rise) 378,380 Scenario 6 (Short-term decline) 492,047 Maximum of 6 scenarios 492,047 152,013 Basic capital 27,609,684 — December 31, 2020 Changes in the Economic D EVE) Changes in net interest D NII) (In millions of Korean won) Scenario 1 (Parallel rise) ￦ 544,087 ￦ 415,339 Scenario 2 (Parallel decline) — — Scenario 3 (Short-term decline, long-term rise) 245,337 Scenario 4 (Short-term rise, long-term decline) 423,673 Scenario 5 (Short-term rise) 466,220 Scenario 6 (Short-term decline) 480,246 Maximum of 6 scenarios 544,087 415,339 Basic capital 28,234,310 —
Disclosure Of Measurement Of Interest Rate VaR [Text Block]	Non-bank subsidiaries Interest rate VaR is the maximum possible loss due to interest rate risk under a normal distribution at a 99.9% confidence level. The measurement results of risk as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) KB Securities Co., Ltd. ￦ 20,605 ￦ 28,396 KB Insurance Co., Ltd. 345,292 585,648 KB Kookmin Card Co., Ltd. 49,878 64,783 Prudential Life Insurance Company of Korea Ltd. — 132,576 KB Life Insurance Co., Ltd. 56,214 29,392 KB Capital Co., Ltd. 33,038 27,805 KB Savings Bank Co., Ltd. 6,510 6,014
Foreign Currency Disclosure [Text Block]	Details of financial instruments denominated in foreign currencies and translated into Korean won as of December 31, 2019 and 2020, are as follows: December 31, 2019 USD JPY EUR GBP CNY Others Total (In millions of Korean won) Financial assets Cash and due from financial institutions ￦ 2,581,674 ￦ 354,484 ￦ 377,651 ￦ 128,600 ￦ 1,207,769 ￦ 840,250 ￦ 5,490,428 Financial assets at fair value through profit or loss 6,275,426 43,124 610,820 23,034 6,131 149,188 7,107,723 Derivatives held for trading 244,010 22,729 25,226 698 6,786 48,396 347,845 Derivatives held for hedging 83,610 — — — — — 83,610 Loans measured at amortized cost 14,478,537 484,087 795,285 178,628 1,205,297 991,445 18,133,279 Financial assets at fair value through other comprehensive income 4,643,921 21,267 71,078 — 282,390 39,186 5,057,842 Financial assets at amortized cost 2,380,000 — 304,484 — 97,845 101,958 2,884,287 Other financial assets 1,619,738 230,542 313,363 18,237 186,607 195,691 2,564,178 ￦ 32,306,916 ￦ 1,156,233 ￦ 2,497,907 ￦ 349,197 ￦ 2,992,825 ￦ 2,366,114 ￦ 41,669,192 Financial liabilities Financial liabilities at fair value through profit or loss ￦ 2,754,602 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 2,754,602 Derivatives held for trading 351,394 39,050 36,018 — 7,806 67,809 502,077 Derivatives held for hedging 35,538 — — — — — 35,538 Deposits 12,266,565 766,720 791,638 45,892 1,477,097 560,939 15,908,851 Borrowings 9,399,828 125,096 419,155 408,918 15,092 247,943 10,616,032 Debentures 5,007,285 — — — — 338,225 5,345,510 Other financial liabilities 2,556,502 60,029 101,289 22,531 190,841 254,876 3,186,068 ￦ 32,371,714 ￦ 990,895 ￦ 1,348,100 ￦ 477,341 ￦ 1,690,836 ￦ 1,469,792 ￦ 38,348,678 Off-balance ￦ 18,702,327 ￦ 32,694 ￦ 176,756 ￦ — ￦ 252,369 ￦ 257,881 ￦ 19,422,027 December 31, 2020 USD JPY EUR GBP CNY Others Total (In millions of Korean won) Financial assets Cash and due from financial institutions ￦ 4,482,459 ￦ 583,545 ￦ 558,793 ￦ 113,586 ￦ 878,798 ￦ 1,152,515 ￦ 7,769,696 Financial assets at fair value through profit or loss 5,464,176 39,817 508,587 30,030 6,046 177,545 6,226,201 Derivatives held for trading 339,190 18,061 41,834 1,774 4,344 9,724 414,927 Derivatives held for hedging 112,431 — — — — — 112,431 Loans measured at amortized cost 18,783,163 565,918 1,387,089 259,787 1,617,715 5,597,016 28,210,688 Financial assets at fair value through other comprehensive income 5,446,539 5,271 35,478 — 342,804 224,801 6,054,893 Financial assets at amortized cost 1,660,713 — 300,315 — 108,594 537,966 2,607,588 Other financial assets 2,747,958 50,573 231,435 20,162 122,642 353,707 3,526,477 ￦ 39,036,629 ￦ 1,263,185 ￦ 3,063,531 ￦ 425,339 ￦ 3,080,943 ￦ 8,053,274 ￦ 54,922,901 Financial liabilities Financial liabilities at fair value through profit or loss ￦ 1,267,690 ￦ — ￦ — ￦ — ￦ — ￦ — ￦ 1,267,690 Derivatives held for trading 497,975 21,221 84,712 1,817 42,023 36,625 684,373 Derivatives held for hedging 139,528 — — — — 14,050 153,578 Deposits 16,441,107 933,268 991,872 66,440 1,755,272 4,331,641 24,519,600 Borrowings 10,068,379 485,618 402,802 501,716 439 1,728,281 13,187,235 Debentures 5,135,667 — 666,873 — — 308,675 6,111,215 Other financial liabilities 3,407,300 38,979 98,093 9,911 51,331 237,281 3,842,895 ￦ 36,957,646 ￦ 1,479,086 ￦ 2,244,352 ￦ 579,884 ￦ 1,849,065 ￦ 6,656,553 ￦ 49,766,586 Off-balance ￦ 14,991,859 ￦ 32,200 ￦ 248,007 ￦ 741 ￦ 253,472 ￦ 906,502 ￦ 16,432,781
Disclosure Of Objectives Policies And Processes For Managing Capital Explanatory	The Group complies with the capital adequacy standard established by the Financial Services Commission. This capital adequacy standard is based on Basel III revised by Basel Committee on Banking Supervision in Bank for International Settlements in June 2011 and was implemented in Korea in December 2013. The Group is required to maintain a minimum Common Equity Tier 1 ratio of at least 8.0%, a minimum Tier 1 ratio of :9.5% and a minimum Total Regulatory Capital of 11.5% as of December 31, 2020. The Group’s equity capital is classified into three categories in accordance with the Supervisory Regulations and Detailed Supervisory Regulations on Financial Holding Companies: • Common Equity Tier 1 Capital: Common equity Tier 1 Capital is the first to take losses in the Group and is the last to be compensated in liquidation of the Group and not repaid except for liquidation. It includes capital, capital surplus, retained earnings, non-controlling • Additional Tier 1 Capital: Additional Tier 1 Capital includes capital, capital surplus, etc. related to the issuance of capital securities of a permanent nature that meets the conditional capital securities requirements. • Tier 2 Capital: Tier 2 Capital means capital that can compensate for losses of the Group upon liquidation, including (a) the amount of subordinated bonds with maturity of not less than 5 years that meet the conditional capital securities requirements, and (b) the allowance for credit losses accumulated on the loans which are classified as normal or precautionary in accordance with Regulation on Supervision of Financial Holding Companies and others. The risk-weighted assets are the magnitude of the amount of risk inherent in the total asset held by the Group. The Group calculates risk-weighted assets by each risk (credit risk, market risk, and operational risk) based on the Supervisory Regulations and Detailed Supervisory Regulations on Financial Holding Companies and uses them to calculate BIS ratio. The Group evaluates and manages capital adequacy through separate internal policies. The valuation of capital adequacy compares the size of available capital (the amount of capital actually available) to the size of internal capital (the amount of capital required to cover all the significant risks faced by the Group under its target credit rating), which monitors financial soundness and provides a risk-adjusted performance measurement basis. Internal capital refers to the capital required to prevent the insolvency from future unexpected losses. The Group operates a system to measure, allocate and manage internal capital to major subsidiaries by risk type. The Risk Management Committee of the Group determines the risk appetite of the Group, allocates internal capital by risk type and major subsidiaries, and major subsidiaries operate capital efficiently within the range of the allocated internal capital. The Risk Management Department of the Group monitors internal capital limit management and reports it to the management and the Risk Management Committee. If the limit of internal capital is expected to be exceeded due to new businesses or business expansion, the Group’s capital adequacy management is carried out through review and approval by the Risk Management Committee in advance. Details of the Group’s capital adequacy calculation in accordance with Basel III requirements as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Equity Capital: ￦ 36,995,181 ￦ 40,080,136 Tier 1 Capital 35,426,114 36,895,778 Common Equity Tier 1 Capital 34,709,873 34,886,283 Additional Tier 1 Capital 716,241 2,009,495 Tier 2 Capital 1,569,067 3,184,358 Risk-weighted assets: 255,549,020 262,349,242 Equity Capital (%): 14.48 15.28 Tier 1 Capital (%) 13.86 14.06 Common Equity Tier 1 Capital (%) 13.58 13.30
Disclosure of nature and extent of risks arising from financial instruments [Text Block]	4.2.1 Overview of credit risk Credit risk is the risk of loss from the portfolio of assets held due to the counterparty’s default, breach of contract and deterioration of credit quality. For risk management reporting purposes, the Group considers all factors of credit risk exposure, such as default risk of individual borrowers, country risk and risk of specific sectors. The Group defines default as the definition applied to the calculation of Capital Adequacy Ratio under the new Basel Accord (Basel III). 4.2.2 Credit risk management The Group measures the expected loss and economic capital for the assets subject to credit risk management, including on-balance off-balance In addition, to prevent excessive concentration of exposures by borrower and industry, the total exposure limit at the Group level is introduced, applied, and managed to control the credit concentration risk. All of the Kookmin Bank’s loan customers (individuals and corporates) are assigned with credit rating and managed by a comprehensive internal credit evaluation system. For individuals, the credit rating takes into account the personal information, income and job information, asset information, and bank transaction information. For corporates, the credit rating is evaluated by analyzing and utilizing financial and non-financial The credit rating, once assigned, serves as the fundamental instrument in Kookmin Bank’s credit risk management, and is applied in a wide range of credit risk management processes, including credit approval, credit limit management, loan pricing and computation of allowance for credit loss. For corporates, Kookmin Bank conducts a regular credit evaluation at least once a year, and the review and supervision departments regularly validate the adequacy of credit ratings to manage credit risks. KB Kookmin Card Co., Ltd.’s credit scoring system is divided into Application Scoring System (“ASS”) and Behavior Scoring System (“BSS”). For applications that meet the eligibility criteria for card issuance, the card will be issued only if the ASS credit rating is above the standard. KB Kookmin Card Co., Ltd.’s internal information, a credit bureau company’s external information and personal information on the application are used to calculate the ASS credit rating. The BSS, which is recalculated on a weekly basis, predicts the delinquency probability of cardholders, and utilizes it to monitor cardholders and portfolio risk. In order to establish a credit risk management system, the Group manages credit risk by forming a separate risk management organization. In particular, independent of the Sales Group, the Credit Analysis Group of Kookmin Bank, a subsidiary, is in charge of loan policy, loan system, credit rating, credit analysis, follow-up 4.3.1 Overview of liquidity risk Liquidity risk is a risk that the Group becomes insolvent due to the mismatch between the inflow and outflow of funds, unexpected cash outflows, or a risk of loss due to financing funds at a high interest rate or disposing of securities at an unfavorable price due to lack of available funds. The Group manages its liquidity risk through analysis of the contractual maturity of interest-bearing assets and liabilities, assets and liabilities related to the other inflows and outflows of funds, and off-balance 4.3.2 Liquidity risk management and indicator The liquidity risk is managed by risk management policies and liquidity risk management guidelines set forth in these policies applied to all risk management policies and procedures that may arise throughout the overall business of the Group. The Group calculates and manages cumulative liquidity gaps and liquidity ratio for all transactions and off-balance 4.4.1 Concept Market risk refers to risks that can result in losses due to changes in market factors such as interest rates, stock prices, and exchange rates etc., which arise from securities and derivatives and others. The most significant risks associated with trading position are interest rate risk and currency risk, and additional risks include stock price risk. The non-trading non-trading 4.4.2 Risk management The Group sets and monitors internal capital limits for market and interest rate risk to manage the risks of trading and non-trading non-trading 4.4.3 Trading position 4.4.3.1 Definition of a trading position The trading position, which is subject to market risk management, is the trading position defined in “Trading Policy and Guidelines” and the basic requirements for the trading position are as follows: • The target position has no restrictions on the sale, and the daily fair value assessment should be made and the embedded significant risk can be hedged in the market. • The trading position classification criteria should be clearly defined in the Trading Policy and Guidelines, and the trading position should be managed by a separate trading department. • The target position must be operated according to the documented trading strategy and the position’s limit management must be carried out. • The specialized dealer or operating department shall have the authority to execute the transaction without prior approval from the Risk Management Department, etc. within the pre-determined • Target positions should be periodically reported to management for risk management of the Group. Details of risk factors (a) Interest rate risk The interest rate risk for trading positions usually arises from debt securities denominated in Korean won. The Group’s trading strategy is to gain short-term trading gains from interest rate fluctuations. The Group manages interest rate risks associated with trading accounts using VaR and sensitivity analysis (Price Value of a Basis Point: PVBP). (b) Stock price risk Stock price risk occurs only in trading stocks denominated in Korean won because there are no trading stocks denominated in foreign currency. The portfolio of trading stocks denominated in Korean won consists of stocks listed on the exchange and derivatives linked to stocks and is managed by strict distributed investment limits. (c) Foreign exchange rate risk Foreign exchange rate risk arises from holding assets, liabilities and currency-related derivatives which are denominated in foreign currency. Most of the net foreign currency exposures occur in the US dollars and the Chinese Yuan. The Group also manages net foreign exchange exposures across trading and non-trading 4.5.1 Concept The Group defines operational risks broadly as all financial and non-financial 4.5.2 Risk management The purpose of operational risk management is not only to comply with supervisory and regulatory requirements, but also to spread risk management culture, strengthen internal control, improve processes and provide timely feedback to management and all employees. Kookmin Bank, a subsidiary, established a Business Continuity Planning (BCP) to carry out continuous work in emergency situations and established alternative facilities. The Group conducts simulation training for headquarters and IT departments to check the business continuity framework.

Segment Information(Table)

Segment Information(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Operating Segments Abstract [Abstract]
Disclosure Of Operating Segments Explanatory	Financial information by business segment for the years ended December 31, 2019 and 2020, are as follows: 2019 Banking business Corporate Retail Other banking Sub-total Securities Non-life Credit card Life Others Consolidation Total (In millions of Korean won) Operating revenues from external customers ￦ 2,375,800 ￦ 2,979,503 ￦ 1,591,323 ￦ 6,946,626 ￦ 1,113,200 ￦ 1,185,600 ￦ 1,470,910 ￦ 107,404 ￦ 608,111 ￦ — ￦ 11,431,851 Intersegment operating revenues (expenses) 204,476 — 167,966 372,442 (18,795 ) (54,160 ) (209,874 ) (22,742 ) 124,857 (191,728 ) — 2,580,276 2,979,503 1,759,289 7,319,068 1,094,405 1,131,440 1,261,036 84,662 732,968 (191,728) 11,431,851 Net interest income 2,844,880 3,148,061 370,846 6,363,787 529,888 616,378 1,230,288 159,248 296,512 686 9,196,787 Interest income 4,642,555 4,872,937 1,264,456 10,779,948 852,153 617,617 1,581,178 159,463 687,823 (38,995 ) 14,639,187 Interest expense (1,797,675 ) (1,724,876 ) (893,610 ) (4,416,161 ) (322,265 ) (1,239 ) (350,890 ) (215 ) (391,311 ) 39,681 (5,442,400 ) Net fee and commission income (expenses) 349,393 471,869 312,034 1,133,296 580,435 (152,597 ) 261,829 (16,792 ) 541,343 7,490 2,355,004 Fee and commission income 459,879 577,845 445,638 1,483,362 683,600 11,095 1,406,273 239 617,622 (322,944 ) 3,879,247 Fee and commission expense (110,486 ) (105,976 ) (133,604 ) (350,066 ) (103,165 ) (163,692 ) (1,144,444 ) (17,031 ) (76,279 ) 330,434 (1,524,243 ) Net insurance income (expenses) — — — — — 415,112 15,748 (122,295 ) — (9,053 ) 299,512 Insurance income — — — — — 11,375,543 28,874 942,662 — (29,897 ) 12,317,182 Insurance expenses — — — — — (10,960,431 ) (13,126 ) (1,064,957 ) — 20,844 (12,017,670 ) Net gains (losses) on financial instruments at fair value through profit or loss (2,526 ) — 425,150 422,624 (103,815 ) 265,187 371 66,773 137,680 (144,948 ) 643,872 Net other operating income (expenses) (611,471 ) (640,427 ) 651,259 (600,639 ) 87,897 (12,640 ) (247,200 ) (2,272 ) (242,567 ) (45,903 ) (1,063,324 ) General and administrative expenses ￦ (1,241,721 ) ￦ (1,982,375 ) ￦ (663,323 ) ￦ (3,887,419 ) ￦ (757,276 ) ￦ (843,800 ) ￦ (441,921 ) ￦ (66,514 ) ￦ (373,919 ) ￦ 99,832 ￦ (6,271,017 ) Operating profit before provision for credit losses 1,338,555 997,128 1,095,966 3,431,649 337,129 287,640 819,115 18,148 359,049 (91,896 ) 5,160,834 Reversal (provision) for credit losses 125,919 (235,995 ) 6,546 (103,530 ) (14,366 ) 12,959 (439,765 ) 3,084 (128,331 ) (236 ) (670,185 ) Net operating income 1,464,474 761,133 1,102,512 3,328,119 322,763 300,599 379,350 21,232 230,718 (92,132 ) 4,490,649 Share of profit (loss) of associates and joint ventures — — 29,240 29,240 (103 ) (21 ) 1,106 — 7,201 (20,972 ) 16,451 Net other non-operating (262 ) — (38,625 ) (38,887 ) 30,518 26,490 3,362 (30 ) 34,644 (29,211 ) 26,886 Segment profit before income tax 1,464,212 761,133 1,093,127 3,318,472 353,178 327,068 383,818 21,202 272,563 (142,315 ) 4,533,986 Income tax expense (404,426 ) (209,311 ) (265,656 ) (879,393 ) (95,271 ) (92,381 ) (67,262 ) (5,238 ) (90,366 ) 9,124 (1,220,787 ) Profit for the year ￦ 1,059,786 ￦ 551,822 ￦ 827,471 ￦ 2,439,079 ￦ 257,907 ￦ 234,687 ￦ 316,556 ￦ 15,964 ￦ 182,197 ￦ (133,191 ) ￦ 3,313,199 Profit attributable to shareholders of the Parent Company 1,059,786 551,822 827,471 2,439,079 257,893 234,326 316,545 15,964 179,783 (131,762 ) 3,311,828 Profit attributable to non-controlling — — — — 14 361 11 — 2,414 (1,429 ) 1,371 Total assets* 139,496,393 147,468,173 100,460,472 387,425,038 47,816,512 36,552,368 22,990,115 9,801,904 42,140,936 (28,188,756 ) 518,538,117 Total liabilities* 142,063,122 161,834,984 54,522,699 358,420,805 43,131,858 32,689,460 18,925,195 9,186,567 18,675,585 (1,610,678 ) 479,418,792 2020 Banking business Securities Non-life Credit card Life Others Consolidation Total Corporate Retail Other Sub-total (In millions of Korean won) Operating revenues from external customers ￦ 2,833,601 ￦ 2,918,826 ￦ 1,797,921 ￦ 7,550,348 ￦ 1,448,409 ￦ 1,027,269 ￦ 1,538,230 ￦ 237,416 ￦ 690,970 ￦ — ￦ 12,492,642 Intersegment operating revenues (expenses) 178,199 — 108,118 286,317 (6,366 ) 5,976 (183,480 ) (9,655 ) 324,910 (417,702 ) — 3,011,800 2,918,826 1,906,039 7,836,665 1,442,043 1,033,245 1,354,750 227,761 1,015,880 (417,702 ) 12,492,642 Net interest income 3,238,002 3,178,280 338,484 6,754,766 510,566 615,951 1,265,703 260,925 314,832 (469 ) 9,722,274 Interest income 4,899,943 4,519,579 1,036,643 10,456,165 820,100 616,852 1,631,520 261,056 726,668 (26,614 ) 14,485,747 Interest expense (1,661,941 ) (1,341,299 ) (698,159 ) (3,701,399 ) (309,534 ) (901 ) (365,817 ) (131 ) (411,836 ) 26,145 (4,763,473 ) Net fee and commission income (expenses) 363,459 406,603 297,860 1,067,922 916,758 (171,220 ) 400,485 (18,059 ) 776,282 (13,229 ) 2,958,939 Fee and commission income 480,190 529,178 440,319 1,449,687 1,037,545 8,571 1,485,718 98 871,499 (326,094 ) 4,527,024 Fee and commission expense (116,731 ) (122,575 ) (142,459 ) (381,765 ) (120,787 ) (179,791 ) (1,085,233 ) (18,157 ) (95,217 ) 312,865 (1,568,085 ) Net insurance income (expenses) — — — — — 376,827 13,283 (91,410 ) — 1,293 299,993 Insurance income — — — — — 12,367,894 23,989 2,026,052 — (31,295 ) 14,386,640 Insurance expenses — — — — — (11,991,067 ) (10,706 ) (2,117,462 ) — 32,588 (14,086,647 ) Net gains (losses) on financial instruments at fair value through profit or loss (52,493 ) — 296,676 244,183 117,792 259,274 5,904 71,350 396,626 (83,763 ) 1,011,366 Net other operating income (expenses) (537,168 ) (666,057 ) 973,019 (230,206 ) (103,073 ) (47,587 ) (330,625 ) 4,955 (471,860 ) (321,534 ) (1,499,930 ) General and administrative expenses ￦ (1,555,089) ￦ (2,072,515) ￦ (573,742) ￦ (4,201,346) ￦ (844,503) ￦ (829,263) ￦ (514,845) ￦ (152,271) ￦ (405,530) ￦ 114,606 ￦ (6,833,152) Operating profit before provision for credit losses 1,456,711 846,311 1,332,297 3,635,319 597,540 203,982 839,905 75,490 610,350 (303,096 ) 5,659,490 Reversal (provision) for credit losses (204,302 ) (264,943 ) (14,937 ) (484,182 ) (23,827 ) 7,569 (396,376 ) 472 (148,127 ) 973 (1,043,498 ) Net operating income 1,252,409 581,368 1,317,360 3,151,137 573,713 211,551 443,529 75,962 462,223 (302,123 ) 4,615,992 Share of profit (loss) of associates and joint ventures — — (48,158 ) (48,158 ) 3,598 (42 ) 1,127 1 553 (829 ) (43,750 ) Net other non-operating 5,490 — 23,354 28,844 4,472 16,142 (6,636 ) (16,270 ) 40,927 121,911 189,390 Segment profit before income tax 1,257,899 581,368 1,292,556 3,131,823 581,783 227,651 438,020 59,693 503,703 (181,041 ) 4,761,632 Income tax expense (339,728 ) (159,876 ) (312,700 ) (812,304 ) (156,135 ) (63,778 ) (114,027 ) (27,167 ) (97,268 ) 11,328 (1,259,351 ) Profit for the year ￦ 918,171 ￦ 421,492 ￦ 979,856 ￦ 2,319,519 ￦ 425,648 ￦ 163,873 ￦ 323,993 ￦ 32,526 ￦ 406,435 ￦ (169,713) ￦ 3,502,281 Profit attributable to shareholders of the Parent Company 917,956 421,492 958,747 2,298,195 425,622 163,884 324,662 32,526 404,381 (194,119 ) 3,455,151 Profit (loss) attributable to non-controlling 215 — 21,109 21,324 26 (11 ) (669 ) — 2,054 24,406 47,130 Total assets * 164,323,181 161,330,053 112,790,880 438,444,114 57,570,654 39,078,117 24,071,645 35,546,572 47,408,052 (31,446,962 ) 610,672,192 Total liabilities * 167,236,387 176,571,944 64,227,709 408,036,040 52,516,488 35,086,458 19,789,959 32,524,518 21,598,232 (2,240,962 ) 567,310,733 * Assets and liabilities of the reporting segments are amounts before intersegment transactions.
Disclosure Of Products And Services Explanatory	Operating revenues from external customers by services for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Banking service ￦ 6,579,169 ￦ 6,946,626 ￦ 7,550,348 Securities service 997,898 1,113,200 1,448,409 Non-life 1,183,394 1,185,600 1,027,269 Credit card service 1,524,695 1,470,910 1,538,230 Life insurance service 113,238 107,404 237,416 Other service 461,293 608,111 690,970 ￦ 10,859,687 ￦ 11,431,851 ￦ 12,492,642
Disclosure Of Geographical Areas Explanatory	Geographical operating revenues from external customers for the years ended December 31, 2018, 2019 and 2020, and major non-current Revenues from external customers Major non-current 2018 2019 2020 December 31, 2019 December 31, 2020 (In millions of Korean won) Domestic ￦ 10,666,586 ￦ 11,142,264 ￦ 11,891,540 ￦ 9,515,220 ￦ 10,603,254 United States 46,391 72,945 114,044 386,724 45,353 New Zealand 6,213 6,946 3,554 3,516 2,385 China 94,996 109,574 84,821 15,119 13,971 Cambodia 11,062 19,534 250,426 7,162 32,354 United Kingdom 8,119 10,037 28,681 85,634 81,879 Others 26,320 70,551 119,576 551,039 51,288 Consolidation — — — 68,764 487,742 ￦ 10,859,687 ￦ 11,431,851 ￦ 12,492,642 ￦ 10,633,178 ￦ 11,318,226

Financial Assets and Financia_2

Financial Assets and Financial Liabilities(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Financial Instruments Abstract [Abstract]
Disclosure Of Fair Value Measurement Explanatory	Carrying amount and fair value of financial assets and liabilities by category as of December 31, 2019 and 2020, are as follows: December 31, 2019 Carrying amount Fair value (In millions of Korean won) Financial assets Cash and due from financial institutions ￦ 20,837,878 ￦ 20,835,235 Financial assets at fair value through profit or loss 53,549,086 53,549,086 Due from financial institutions 216,367 216,367 Debt securities 50,721,526 50,721,526 Equity securities 2,103,843 2,103,843 Loans 427,545 427,545 Others 79,805 79,805 Derivatives held for trading 3,008,598 3,008,598 Derivatives held for hedging 182,075 182,075 Loans measured at amortized cost 339,684,059 340,836,884 Securities measured at amortized cost 25,346,555 26,570,494 Financial assets at fair value through other comprehensive income 46,436,051 46,436,051 Debt securities 43,556,848 43,556,848 Equity securities 2,504,105 2,504,105 Loans 375,098 375,098 Other financial assets 9,147,059 9,147,059 ￦ 498,191,361 ￦ 500,565,482 Financial liabilities Financial liabilities at fair value through profit or loss ￦ 2,663,327 ￦ 2,663,327 Financial liabilities designated at fair value through profit or loss 12,704,826 12,704,826 Derivatives held for trading 2,842,950 2,842,950 Derivatives held for hedging 164,391 164,391 Deposits 305,592,771 306,048,291 Borrowings 37,818,860 37,808,944 Debentures 50,935,583 51,558,748 Other financial liabilities 22,629,587 22,629,587 ￦ 435,352,295 ￦ 436,421,064 December 31, 2020 Carrying amount Fair value (In millions of Korean won) Financial assets Cash and due from financial institutions ￦ 25,608,842 ￦ 25,612,273 Financial assets at fair value through profit or loss 61,035,455 61,035,455 Due from financial institutions 100,094 100,094 Debt securities 58,415,100 58,415,100 Equity securities 2,092,313 2,092,313 Loans 337,983 337,983 Others 89,965 89,965 Derivatives held for trading 5,210,512 5,210,512 Derivatives held for hedging 334,873 334,873 Loans measured at amortized cost 377,166,984 378,791,808 Securities measured at amortized cost 36,870,229 38,026,073 Financial assets at fair value through other comprehensive income 61,825,197 61,825,197 Debt securities 58,456,889 58,456,889 Equity securities 3,074,899 3,074,899 Loans 293,409 293,409 Other financial assets 14,167,689 14,167,689 ￦ 582,219,781 ￦ 585,003,881 Financial liabilities Financial liabilities at fair value through profit or loss ￦ 2,025,951 ￦ 2,025,951 Financial liabilities designated at fair value through profit or loss 9,784,107 9,784,107 Derivatives held for trading 5,014,072 5,014,072 Derivatives held for hedging 208,825 208,825 Deposits 338,580,220 338,833,784 Borrowings 49,827,156 50,081,900 Debentures 62,760,687 63,189,132 Other financial liabilities 28,612,287 28,612,287 ￦ 496,813,305 ￦ 497,750,058 Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. The Group discloses the fair value of each class of assets and liabilities in a way that permits it to be compared with its carrying amount at the end of each reporting period. The best evidence of fair value of financial instruments is a quoted price in an active market. Methods of determining fair value of financial instruments are as follows: Cash and due from financial institutions Carrying amounts of cash and demand due from financial institutions and payment due from financial institutions are reasonable approximation of fair values. These financial instruments do not have a fixed maturity and are receivable on demand. Fair value of ordinary due from financial institutions is measured using Discounted Cash Flow (“DCF”) Model. Securities Fair value of financial instruments that are quoted in active markets is determined using the quoted prices. If there is no quoted price, fair value is determined using external professional valuation institution. The institutions use one or more of the following valuation techniques including DCF Model, Free Cash Flow to Equity Model, Comparable Company Analysis, Dividend Discount Model, Risk Adjusted Discount Rate Method, and Net Asset Value Method, deemed suitable considering the characteristics of the financial instruments. Loans measured at amortized cost DCF model is used to determine the fair value of loans. Fair value is determined by discounting the expected cash flows, which are contractual cash flows adjusted by the expected prepayment rate, at an appropriate discount rate. Derivatives and financial instruments at fair value through profit or loss For exchange traded derivatives, quoted price in an active market is used to determine fair value and for OTC derivatives, fair value is determined using valuation techniques. The Group uses internally developed valuation models that are widely used by market participants to determine fair values of plain vanilla OTC derivatives including options, interest rate swaps, and currency swaps, based on observable market parameters. However, some complex financial instruments are valued using appropriate models developed from generally accepted market valuation models including the Finite Difference Method (“FDM”), the MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Closed Form and Tree Model or valuation results from independent external professional valuation institution. Deposits Carrying amount of demand deposits is regarded as representative of fair value because they do not have a fixed maturity and are payable on demand. Fair value of time deposits is determined using a DCF model. Fair value is determined by discounting the expected cash flows, which are contractual cash flows adjusted by the expected prepayment rate, at an appropriate discount rate. Borrowings Carrying amount of overdraft in foreign currency is regarded as representative of fair value because they do not have a fixed maturity and are payable on demand. Fair value of other borrowings is determined using a DCF model discounting contractual future cash flows at an appropriate discount rate. Debentures Fair value is determined by using the valuation results of external professional valuation institution, which are calculated using market inputs. Other financial assets and liabilities Carrying amounts are reasonable approximation of fair values. These financial instruments are temporary accounts used for other various transactions and their maturities are relatively short or not defined. Fair value hierarchy of financial assets and liabilities at fair value in the consolidated statements of financial position as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value hierarchy Total Level 1 Level 2 Level 3 (In millions of Korean won) Financial assets Financial assets at fair value through profit or loss ￦ 11,177,716 ￦ 31,476,070 ￦ 10,895,300 ￦ 53,549,086 Due from financial institutions — 165,242 51,125 216,367 Debt securities 9,853,733 30,735,027 10,132,766 50,721,526 Equity securities 1,244,178 336,389 523,276 2,103,843 Loans — 239,412 188,133 427,545 Others 79,805 — — 79,805 Derivatives held for trading 72,983 2,398,831 536,784 3,008,598 Derivatives held for hedging — 182,075 — 182,075 Financial assets at fair value through other comprehensive income 15,188,993 29,764,660 1,482,398 46,436,051 Debt securities 14,236,566 29,320,282 — 43,556,848 Equity securities 952,427 69,280 1,482,398 2,504,105 Loans — 375,098 — 375,098 ￦ 26,439,692 ￦ 63,821,636 ￦ 12,914,482 ￦ 103,175,810 Financial liabilities Financial liabilities at fair value through profit or loss ￦ 2,663,327 ￦ — ￦ — ￦ 2,663,327 Financial liabilities designated at fair value through profit or loss 492 1,482,302 11,222,032 12,704,826 Derivatives held for trading 157,634 2,458,498 226,818 2,842,950 Derivatives held for hedging — 164,391 — 164,391 ￦ 2,821,453 ￦ 4,105,191 ￦ 11,448,850 ￦ 18,375,494 December 31, 2020 Fair value hierarchy Total Level 1 Level 2 Level 3* (In millions of Korean won) Financial assets Financial assets at fair value through profit or loss ￦ 14,508,028 ￦ 35,298,665 ￦ 11,228,762 ￦ 61,035,455 Due from financial institutions — 10,011 90,083 100,094 Debt securities 13,316,819 34,580,168 10,518,113 58,415,100 Equity securities 1,101,244 409,259 581,810 2,092,313 Loans — 299,227 38,756 337,983 Others 89,965 — — 89,965 Derivatives held for trading 90,459 4,678,185 441,868 5,210,512 Derivatives held for hedging — 334,873 — 334,873 Financial assets at fair value through other comprehensive income 18,731,801 40,645,505 2,447,891 61,825,197 Debt securities 18,147,167 40,309,722 — 58,456,889 Equity securities 584,634 70,357 2,419,908 3,074,899 Loans — 265,426 27,983 293,409 ￦33,330,288 ￦80,957,228 ￦14,118,521 ￦128,406,037 Financial liabilities Financial liabilities at fair value through profit or loss ￦ 2,025,951 ￦ — ￦ — ￦ 2,025,951 Financial liabilities designated at fair value through profit or loss 1,040 581,636 9,201,431 9,784,107 Derivatives held for trading 204,470 4,668,155 141,447 5,014,072 Derivatives held for hedging — 208,825 — 208,825 ￦2,231,461 ￦5,458,616 ￦9,342,878 ￦17,032,955 * Included KB Securities Co., Ltd.’s OTC derivatives consist of ￦ 635,920 million of financial assets at fair value through profit or loss (debt instruments), ￦ 9,201,431 million of financial liabilities designated at fair value through profit or loss, ￦ 441,775 million of derivative financial assets and ￦ 134,934 million of derivative financial liabilities. Valuation techniques and inputs of financial assets and liabilities classified as Level 2 and measured at fair value in the consolidated statements of financial position as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value Valuation techniques Inputs (In millions of Korean won) Financial assets Financial assets at fair value through profit or loss ￦ 31,476,070 Due from financial institutions 165,242 DCF Model, One factor Hull-White Model Discount rate, Volatility and others Debt securities 30,735,027 DCF Model, Closed Form, Option Model, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Net Asset Value Method and others Projected cash flow, Fair value of underlying asset, Dividend yield, Price of underlying asset, Interest rate, Discount rate, Volatility, Correlation coefficient and others Equity securities 336,389 DCF Model Interest rate, Discount rate and others Loans 239,412 DCF Model Interest rate, Discount rate and others Derivatives held for trading 2,398,831 DCF Model, Closed Form, FDM, Option Model, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model and others Discount rate, Underlying asset Index, Volatility, Correlation coefficient, Interest rate, Stock price, Foreign exchange rate, Dividend yield, Probability of default (PD), Credit spread and others Derivatives held for hedging 182,075 DCF Model, Closed Form, FDM and others Discount rate, Volatility, Foreign exchange rate and others Financial assets at fair value through other comprehensive income 29,764,660 Debt securities 29,320,282 DCF Model, Option Model, Market value approach Discount rate, Underlying asset Index, Volatility and others Equity securities 69,280 DCF Model, Black-Scholes Model Discount rate, Underlying asset Index, Volatility and others Loans 375,098 DCF Model Discount rate, Underlying asset Index, Volatility and others ￦ 63,821,636 Financial liabilities Financial liabilities designated at fair value through profit or loss ￦ 1,482,302 Derivatives held for trading 2,458,498 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Option Model, FDM and others Discount rate, Underlying asset Index, Volatility, Correlation coefficient, Interest rate, Stock price, Foreign exchange rate, Dividend yield, Probability of default (PD), Credit spread and others Derivatives held for hedging 164,391 DCF Model, Closed Form, FDM and others Discount rate, Volatility, Foreign exchange rate and others ￦ 4,105,191 December 31, 2020 Fair value Valuation techniques Inputs (In millions of Korean won) Financial assets Financial assets at fair value through profit or loss ￦ 35,298,665 Due from financial institutions 10,011 DCF Model Projected cash flow, Discount rate Debt securities 34,580,168 DCF Model, Closed Form, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Net Asset Value Method and others Projected cash flow, Fair value of underlying asset, Dividend yield, Price of underlying asset, Interest rate, Discount rate, Volatility, Correlation coefficient and others Equity securities 409,259 DCF Model Interest rate, Discount rate and others Loans 299,227 DCF Model Interest rate, Discount rate and others Derivatives held for trading 4,678,185 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Black-Scholes Discount rate, Underlying asset Index, Volatility, Interest rate, Stock price, Foreign exchange rate, Dividend yield and others Derivatives held for hedging 334,873 DCF Model, Closed Form, FDM and others Discount rate, Volatility, Foreign exchange rate and others Financial assets at fair value through other comprehensive income 40,645,505 Debt securities 40,309,722 DCF Model, Market value approach Discount rate, Volatility and others Equity securities 70,357 DCF Model Interest rate, Discount rate and others Loans 265,426 DCF Model Discount rate, Volatility and others ￦ 80,957,228 Financial liabilities Financial liabilities designated at fair value through profit or loss ￦ 581,636 Derivatives held for trading 4,668,155 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model and others Discount rate, Price of underlying asset, Volatility, Interest rate, Stock price, Foreign exchange rate, Dividend yield and others Derivatives held for hedging 208,825 DCF Model, Closed Form, FDM and others Discount rate, Foreign exchange rate and others ￦ 5,458,616 Fair value hierarchy of financial assets and liabilities whose fair value is disclosed Fair value hierarchy of financial assets and liabilities whose fair value is disclosed as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value hierarchy Total Level 1 Level 2 Level 3 (In millions of Korean won) Financial assets Cash and due from financial institutions 1 ￦ 3,015,104 ￦ 13,812,640 ￦ 4,007,491 ￦ 20,835,235 Loans measured at amortized cost — 372,988 340,463,896 340,836,884 Securities measured at amortized cost 9,587,770 16,979,656 3,068 26,570,494 Other financial assets 2 — — 9,147,059 9,147,059 ￦ 12,602,874 ￦ 31,165,284 ￦ 353,621,514 ￦ 397,389,672 Financial liabilities Deposits 1 ￦ — ￦ 142,021,800 ￦ 164,026,491 ￦ 306,048,291 Borrowings 3 — 1,469,263 36,339,681 37,808,944 Debentures — 46,969,992 4,588,756 51,558,748 Other financial liabilities 2 — — 22,629,587 22,629,587 ￦ — ￦ 190,461,055 ￦ 227,584,515 ￦ 418,045,570 December 31, 2020 Fair value hierarchy Total Level 1 Level 2 Level 3 (In millions of Korean won) Financial assets Cash and due from financial institutions 1 ￦ 3,362,096 ￦ 19,573,075 ￦ 2,677,102 ￦ 25,612,273 Loans measured at amortized cost — 271,241 378,520,567 378,791,808 Securities measured at amortized cost 19,438,941 18,584,264 2,868 38,026,073 Other financial assets 2 — — 14,167,689 14,167,689 ￦ 22,801,037 ￦ 38,428,580 ￦ 395,368,226 ￦ 456,597,843 Financial liabilities Deposits 1 ￦ — ￦ 181,472,846 ￦ 157,360,938 ￦ 338,833,784 Borrowings 3 — 1,149,734 48,932,166 50,081,900 Debentures — 57,916,235 5,272,897 63,189,132 Other financial liabilities 2 — — 28,612,287 28,612,287 ￦ — ￦ 240,538,815 ￦ 240,178,288 ￦ 480,717,103 1 The amounts included in Level 2 are the carrying amounts which are reasonable approximations of the fair value. 2 Other financial assets and other financial liabilities included in Level 3 are the carrying amounts which are reasonable approximation of fair value. 3 Borrowings of ￦ 4,685 million and ￦ 292 million included in Level 2 is the carrying amounts which are reasonable approximation of fair value as of December 31, 2019 and 2020, respectively. For financial assets and liabilities whose carrying amount is a reasonable approximation of fair value, valuation techniques and inputs are not disclosed. Valuation techniques and inputs of financial assets and liabilities classified as Level 2, and whose fair value is disclosed as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value Valuation techniques Inputs (In millions of Korean won) Financial assets Loans measured at amortized cost ￦ 372,988 DCF Model Discount rate Securities measured at amortized cost 16,979,656 DCF Model, MonteCarlo Simulation Discount rate, ￦ 17,352,644 Financial liabilities Borrowings ￦ 1,464,578 DCF Model Discount rate Debentures 46,969,992 DCF Model Discount rate ￦ 48,435,570 December 31, 2020 Fair value Valuation techniques Inputs (In millions of Korean won) Financial assets Loans measured at amortized cost ￦ 271,241 DCF Model Discount rate Securities measured at amortized cost 18,584,264 DCF Model, MonteCarlo Simulation Discount rate, ￦ 18,855,505 Financial liabilities Borrowings ￦ 1,149,442 DCF Model Discount rate Debentures 57,916,235 DCF Model Discount rate ￦ 59,065,677 Valuation techniques and inputs of financial assets and liabilities classified as Level 3 and, whose fair value is disclosed and as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value Valuation Inputs (In millions of Korean won) Financial assets Cash and due from financial institutions ￦ 4,007,491 DCF Model Credit spread, Other spread, Interest rate Loans measured at amortized cost 340,463,896 DCF Model Credit spread, Other spread, Prepayment rate, Interest rate Securities measured at amortized cost 3,068 DCF Model Interest rate ￦ 344,474,455 Financial liabilities Deposits ￦ 164,026,491 DCF Model Other spread, Prepayment rate, Interest rate Borrowings 36,339,681 DCF Model Other spread, Interest rate Debentures 4,588,756 DCF Model Other spread, Interest rate ￦ 204,954,928 December 31, 2020 Fair value Valuation Inputs ( In millions of Korean won) Financial assets Cash and due from financial institutions ￦ 2,677,102 DCF Model Credit spread, Other spread, Interest rate Loans measured at amortized cost 378,520,567 DCF Model Credit spread, Other spread, Prepayment rate, Interest rate Securities measured at amortized cost 2,868 DCF Model Interest rate ￦ 381,200,537 Financial liabilities Deposits ￦ 157,360,938 DCF Model Other spread, Prepayment rate, Interest rate Borrowings 48,932,166 DCF Model Other spread, Interest rate Debentures 5,272,897 DCF Model Other spread, Interest rate ￦ 211,566,001
Disclosure Of Fair Value Hierarchy Group Classifies And Discloses Fair Value Of Financial Instruments [Text Block]	The Group believes that valuation methods used for measuring the fair values of financial instruments are reasonable and that the fair values recognized in the consolidated statement of financial position are appropriate. However, the fair values of the financial instruments recognized in the consolidated statement of financial position may be different if other valuation methods or assumptions are used. Additionally, as there is a variety of valuation techniques and assumptions used in measuring fair value, it may be difficult to reasonably compare the fair value with that of other financial institutions. The Group classifies and discloses fair value of the financial instruments into the three-level hierarchy as follows: Level 1: The fair values are based on quoted prices (unadjusted) in active markets for identical assets or liabilities that the entity can access at the measurement date. Level 2: The fair values are based on inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Level 3: The fair values are based on unobservable inputs for the asset or liability. The fair value measurement is categorized in its entirety in the same level of the fair value hierarchy as the lowest level input that is significant to the entire measurement. If an observable input requires an adjustment using an unobservable input and that adjustment results in a significantly higher or lower fair value measurement, the resulting measurement would be categorized within Level 3 of the fair value hierarchy.
Disclosure Of Changes In Level 3 Of The Fair Value Hierarchy [Text Block]	Changes in financial instruments classified as Level 3 of the fair value hierarchy for the years ended December 31, 2019 and 2020, are as follows: 2019 Financial assets at fair Financial Financial liabilities at Net derivatives Due from financial Securities Loans measured at Financial assets Financial liabilities Derivatives held for (In millions of Korean won) Beginning ￦ 48,743 ￦ 7,464,860 ￦ 213,203 ￦ 1,332,718 ￦ (10,873,383 ) ￦ (300,131 ) Total gains or losses Profit or loss 1,207 (66,208 ) 10,412 — (1,285,157 ) 851,453 Other comprehensive income (loss) 1,175 111,826 — 55,993 (25,538 ) — Purchases — 4,544,254 154,005 95,359 — — Sales — (2,139,174 ) (189,487 ) (1,672 ) — (163,856 ) Issues — — — — (12,416,402 ) (59,202 ) Settlements — — — — 13,378,448 (1,316 ) Transfers into Level 3* — 851,457 — — — (16,982 ) Transfers out of Level 3* — (110,973 ) — — — — Ending ￦ 51,125 ￦ 10,656,042 ￦ 188,133 ￦ 1,482,398 ￦ (11,222,032 ) ￦ 309,966 2020 Financial assets at fair Financial Financial liabilities at Net derivatives Due from financial Securities Loans measured at Equity securities Loans measured Financial liabilities Derivatives held for (In millions of Korean won) Beginning ￦ 51,125 ￦ 10,656,042 ￦ 188,133 ￦ 1,482,398 ￦ — ￦ (11,222,032 ) ￦ 309,966 Total gains or losses Profit or loss (2,021 ) 22,069 627 (206 ) — (406,788 ) 400,241 Other comprehensive income (loss) (7,693 ) 144,963 — 815,244 (217 ) (27,876 ) — Purchases 135,227 3,519,573 — 122,827 40,000 — (24,165 ) Sales (86,555 ) (3,263,111 ) (150,004 ) (355 ) (11,800 ) — (328,348 ) Issues — — — — — (9,333,419 ) (42,732 ) Settlements — — — — — 11,788,684 90 Transfers into Level 3* — 129,580 — — — — (1,044 ) Transfers out of Level 3* — (109,193 ) — — — — (13,587 ) Ending ￦ 90,083 ￦ 11,099,923 ￦ 38,756 ￦ 2,419,908 ￦ 27,983 ￦ (9,201,431 ) ￦ 300,421 * Changes in levels for the financial instruments occurred due to the change in the availability of observable market data.
Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings Text Block [Text Block]	In relation to changes in Level 3 of the fair value hierarchy, total gains or losses recognized in profit or loss for the year, and total gains or losses recognized in profit or loss from financial instruments held at the end of the reporting period for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 Net gains (losses) Other operating Net interest Net losses on Other operating Net interest (In millions of Korean won) Total gains (losses) recognized in profit or loss for the year ￦ (36,466) ￦ (405) ￦ 617 ￦ (489,703) ￦ 1,388 ￦ 22 Total gains (losses) recognized in profit or loss from financial instruments held at the end of the reporting year 144,674 (289 ) 43 (37,668 ) 1,331 — 2020 Net gains on financial Other operating Net interest income (In millions of Korean won) Total gains (losses) recognized in profit or loss for the year ￦ 70,251 ￦ (56,329 ) ￦ — Total gains (losses) recognized in profit or loss from financial instruments held at the end of the reporting year 129,824 (60,884 ) —
Information About Fair Value Measurements Using Unobservable Inputs Assets[Text Block]	Information about fair value measurements using unobservable inputs as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value Valuation techniques Unobservable inputs Range of Relationship of unobservable inputs to (In millions of Financial assets Financial assets at fair value through profit or loss Due from financial institutions ￦ 51,125 Option Model Volatility of the underlying asset 11.43~34.39 The higher the volatility of the underlying asset, the higher the fair value fluctuation Correlation coefficient -4.84 The higher the correlation coefficient, the higher the fair value fluctuation Debt securities 10,132,766 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull-White Model, Black-Scholes Model, Option Model, Binomial Model, Net Asset Value, Income approach, Market approach and others Growth rate -1.00~1.00 The higher the growth rate, the higher the fair value Volatility 1.00~48.00 The higher the volatility, the higher the fair value fluctuation Discount rate 0.75~17.37 The lower the discount rate, the higher the fair value Recovery rate 40.00 The higher the recovery rate, the higher the fair value Correlation coefficient between underlying assets 3.11~95.67 The higher the correlation coefficient, the higher the fair value fluctuation Liquidation value 0.00 The higher the liquidation value, the higher the fair value Volatility of real estate price -1.00~1.00 The higher the price of real estate, the higher the fair value Equity securities 523,276 Income approach, Market value approach, Asset value approach, DCF Model, Comparable Company Analysis, Risk adjusted discount rate method, Dividend Discount Model, Usage of past transactions, Binomial Model and others Growth rate 0.00~2.20 The higher the growth rate, the higher the fair value Discount rate 2.00~22.00 The lower the discount rate, the higher the fair value Liquidation value -1.00~1.00 The higher the liquidation value, the higher the fair value Volatility 11.90 The higher the volatility, the higher the fair value fluctuation Loans 188,133 Binomial Model, DCF Model Volatility of the stock price 12.91~48.28 The higher the volatility, the higher the fair value fluctuation Discount rate 10.81 The lower the discount rate, the higher the fair value Derivatives held for trading Stock and index ￦ 416,486 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Volatility of the underlying asset 9.75~52.00 The higher the volatility, the higher the fair value fluctuation Model, Black-Scholes Model, Binomial Model Correlation coefficient between underlying assets 4.00~77.00 The higher the correlation coefficient, the higher the fair value fluctuation Currency and interest rate 120,298 DCF Model, Hull-White Model Volatility 2.00~58.00 The higher the volatility, the higher the fair value fluctuation Correlation coefficient between underlying assets -49.00~90.00 The higher the absolute value of correlation coefficient, the higher the fair value fluctuation Financial assets at fair value through other comprehensive income Equity securities 1,482,398 Risk adjusted discount rate method, IMV Model, DCF Model, Comparable Company Analysis, Dividend discount model, Option Model, Net Asset value method, Market approach, One Factor Hull-White Model and others Growth rate 0.00~2.20 The higher the growth rate, the higher the fair value Discount rate 3.04~16.37 The lower the discount rate, the higher the fair value Volatility 20.97~34.87 The higher the volatility, the higher the fair value fluctuation ￦12,914,482 December 31, 2020 Fair value Valuation techniques Unobservable inputs Range of Relationship of unobservable inputs to fair value (In millions of Financial assets Financial assets at fair value through profit or loss Due from financial institutions ￦ 90,083 MonteCarlo Simulation Volatility of the underlying asset 19.40 ~ 36.76 The higher the volatility of the underlying asset, the higher the fair value fluctuation Correlation coefficient 12.27 The higher the correlation coefficient, the higher the fair value fluctuation Debt securities 10,518,113 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull-White Model, Black-Scholes Model, Option Model, Binomial Model, Net Asset Value Method, Income approach, Market approach and others Growth rate 0.00 ~ 2.00 The higher the growth rate, the higher the fair value Volatility 8.00 ~ 179.75 The higher the volatility, the higher the fair value fluctuation Discount rate 0.00 ~ 21.37 The lower the discount rate, the higher the fair value Recovery rate 40 The higher the recovery rate, the higher the fair value Correlation coefficient between underlying assets -61.12 ~ 100.00 The higher the correlation coefficient, the higher the fair value fluctuation Liquidation value 0.00 The higher the liquidation value, the higher the fair value Volatility of real estate price 0.00 The higher the price of real estate, the higher the fair value Equity securities ￦ 581,810 Income approach, Market approach, Asset value approach, DCF Model, Comparable Company Analysis, Risk adjusted discount rate method, Dividend Discount Model, Usage of past transactions, Binomial Model and others Growth rate 0.00 ~ 1.10 The higher the growth rate, the higher the fair value Discount rate 0.60 ~ 18.67 The lower the discount rate, the higher the fair value Liquidation value 0.00 The higher the liquidation value, the higher the fair value Loans 38,756 Binomial Model, DCF Model Volatility of the stock price 0.00 The higher the volatility, the higher the fair value fluctuation Discount rate 7.86 The lower the discount rate, the higher the fair value Derivatives held for trading Stock and index ￦ 382,337 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Volatility of the underlying asset 20.00 ~ 72.00 The higher the volatility, the higher the fair value fluctuation Model, Black-Scholes Model, Binomial Model Correlation coefficient between underlying assets -61.12 ~ 89.01 The higher the correlation coefficient, the higher the fair value fluctuation Others 59,531 DCF Model, Hull-White Model Volatility 0.00 ~ 68.00 The higher the volatility, the higher the fair value fluctuation Correlation coefficient between underlying assets -50.48 ~ 90.95 The higher the correlation coefficient, the higher the fair value fluctuation Financial assets at fair value through other comprehensive income Equity securities 2,419,908 Risk adjusted discount rate method, IMV Model, DCF Model, Comparable Company Analysis, Dividend discount model, Option Model, Net Asset Value Method, Market approach, One Factor Hull-White Model and others Growth rate 0.00 ~ 2.00 The higher the growth rate, the higher the fair value Discount rate 7.60 ~ 19.67 The lower the discount rate, the higher the fair value Volatility 22.11 ~ 24.16 The higher the volatility, the higher the fair value fluctuation Loans 27,983 DCF Model Discount rate 2.21 ~ 4.21 The lower the discount rate, the higher the fair value ￦ 14,118,521
Information About Fair Value Measurements Using Unobservable Inputs Liabilities [Text Block]	Information about fair value measurements using unobservable inputs as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value Valuation techniques Unobservable inputs Range of Relationship of unobservable inputs to (In millions of Financial liabilities Financial liabilities designated at fair value through profit or loss Derivative-linked securities ￦ 11,222,032 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Model, Black-Scholes Model Volatility of the underlying asset 1.00~58.00 The higher the volatility, the higher the fair value fluctuation Correlation coefficient between underlying assets -49.00~90.00 The higher the absolute value of correlation coefficient, the higher the fair value fluctuation Derivatives held for trading Stock and index 54,341 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Model, Black-Scholes Model, Binomial Model Volatility 12.00~52.00 The higher the volatility, the higher the fair value fluctuation Correlation coefficient between underlying assets 9.00~77.00 The higher the correlation coefficient, the higher the fair value fluctuation Others 172,477 MonteCarlo Simulation, Hull and White Model, DCF Model, Closed Form Volatility 2.00~58.00 The higher the volatility, the higher the fair value fluctuation Volatility of the stock price 16.28 The higher the volatility, the higher the fair value fluctuation Volatility of the interest rate 0.52 The higher the volatility, the higher the fair value fluctuation Discount rate 1.94~2.00 The higher the discount rate, the lower the fair value Correlation coefficient between underlying assets 19.00~90.00 The higher the absolute value of correlation coefficient, the higher the fair value fluctuation ￦ 11,448,850 December 31, 2020 Fair value Valuation techniques Unobservable inputs Range of Relationship of unobservable inputs to fair value (In millions of Financial liabilities Financial liabilities designated at fair value through profit or loss Derivative-linked securities ￦ 9,201,431 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Volatility of the underlying asset 1.00 ~ 72.00 The higher the volatility, the higher the fair value fluctuation Model, Black-Scholes Model Correlation coefficient between underlying assets -61.12 ~ 90.95 The higher the absolute value of correlation coefficient, the higher the fair value fluctuation Derivatives held for trading Stock and index 60,291 DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Volatility 20.00 ~ 68.00 The higher the volatility, the higher the fair value fluctuation Model, Black-Scholes Model, Binomial Model Correlation coefficient between underlying assets -61.12 ~ 90.95 The higher the correlation coefficient, the higher the fair value fluctuation Others 81,156 MonteCarlo Simulation, Hull and White Model, DCF Model, Closed Form Volatility 21.00 ~ 68.00 The higher the volatility, the higher the fair value fluctuation Discount rate 1.15 ~ 1.29 The higher the discount rate, the lower the fair value Correlation coefficient between underlying assets -50.48 ~ 90.95 The higher the absolute value of correlation coefficient, the higher the fair value fluctuation ￦ 9,342,878
Sensitivity Analysis Of Changes In Unobservable Inputs Of Financial Assets [Text Block]	Results of the sensitivity analysis of changes in inputs as of December 31, 2019 and 2020, are as follows: December 31, 2019 Profit or loss Other comprehensive income (loss) Favorable changes Unfavorable Favorable Unfavorable (In millions of Korean won) Financial assets Financial assets at fair value through profit or loss 1 Due from financial institutions ￦ 3 ￦ (3) ￦ 2 ￦ (2) Debt securities 4 30,771 (27,062 ) 2,341 (2,276 ) Equity securities 3 24,456 (10,251 ) 1,110 (824 ) Loans 5 6,362 (4,344 ) — — Derivatives held for trading 2 25,830 (29,317 ) — — Financial assets at fair value through other comprehensive income Equity securities 3 — — 214,268 (110,687 ) ￦ 87,422 ￦ (70,977) ￦ 217,721 ￦ (113,789) December 31, 2020 Profit or loss Other comprehensive income (loss) Favorable changes Unfavorable changes Favorable Unfavorable (In millions of Korean won) Financial assets Financial assets at fair value through profit or loss 1 Due from financial institutions ￦ 2 ￦ (2 ) ￦ 199 ￦ (222 ) Debt securities 4 35,790 (12,826 ) 2,123 (2,122 ) Equity securities 3 16,125 (8,275 ) 973 (744 ) Loans 5 3,316 (2,952 ) — — Derivatives held for trading 2 22,783 (25,013 ) — — Financial assets at fair value through other comprehensive income Equity securities 3 — — 120,652 (73,434 ) Loans 6 — — 534 (518 ) ￦ 78,016 ￦ (49,068 ) ￦ 124,481 ￦ (77,040 ) 1 For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by ± 10%. 2 For derivatives financial instruments, changes in fair value are calculated by shifting principal unobservable input parameters; such as, price of underlying asset, volatility of stock price, volatility of interest rate by ± 10% and the loss given default ratio, discount rate by ± 1%. 3 For equity securities, changes in fair value are calculated by shifting principal unobservable input parameters; such as, correlation between growth rate (0~1%) and discount rate (-1~1%) (-1~1%) (-1~1%). 4 For beneficiary certificates, it is practically impossible to analyze sensitivity of changes in unobservable inputs. But only for beneficiary certificates whose underlying assets are real estates, changes in fair value are calculated by shifting correlation between discount rate of rent cashflow (-1~1%) (-1~1%). 5 For loans, changes in fair value are calculated by shifting principal unobservable input parameters such as stock price, volatility of stock price (-10~10%), (-1~1%). 6 For loans measured at fair value through other comprehensive income, changes in fair value are calculated by shifting principal unobservable input parameters such as discount rate, volatility of the underlying asset 1%, growth rate 10%.
Sensitivity Analysis Of Changes In Unobservable Inputs Of Liabilities [Text Block]	Results of the sensitivity analysis of changes in inputs as of December 31, 2019 and 2020, are as follows: December 31, 2019 Profit or loss Other comprehensive income (loss) Favorable changes Unfavorable Favorable Unfavorable (In millions of Korean won) Financial liabilities Financial liabilities designated at fair value through profit or loss 1 ￦ 49,730 ￦ (44,136) ￦ — ￦ — Derivatives held for trading 2 14,638 (13,572 ) — — ￦ 64,368 ￦ (57,708) ￦ — ￦ — December 31, 2020 Profit or loss Other comprehensive income (loss) Favorable changes Unfavorable changes Favorable Unfavorable Financial liabilities Financial liabilities designated at fair value through profit or loss 1 ￦ 46,859 ￦ (42,995 ) ￦ — ￦ — Derivatives held for trading 2 7,255 (7,139 ) — — ￦ 54,114 ￦ (50,134 ) ￦ — ￦ — 1 For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by ± 10%. 2 For derivatives financial instruments, changes in fair value are calculated by shifting principal unobservable input parameters; such as, price of underlying asset, volatility of stock price, volatility of interest rate by ± 10% and the loss given default ratio, discount rate by ± 1%. 3 For equity securities, changes in fair value are calculated by shifting principal unobservable input parameters; such as, correlation between growth rate (0~1%) and discount rate (-1~1%) (-1~1%) (-1~1%). 4 For beneficiary certificates, it is practically impossible to analyze sensitivity of changes in unobservable inputs. But only for beneficiary certificates whose underlying assets are real estates, changes in fair value are calculated by shifting correlation between discount rate of rent cashflow (-1~1%) (-1~1%). 5 For loans, changes in fair value are calculated by shifting principal unobservable input parameters such as stock price, volatility of stock price (-10~10%), (-1~1%). 6 For loans measured at fair value through other comprehensive income, changes in fair value are calculated by shifting principal unobservable input parameters such as discount rate, volatility of the underlying asset 1%, growth rate 10%.
Reconciliation Of Aggregate Difference Yet To Be Recognized In Profit Or Loss Table Text Block [Text Block]	Changes in aggregate deferred differences for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 (In millions of Korean won) Balance at the beginning of the year ￦ 62,155 ￦ 45,767 New transactions 168,225 166,555 Changes during the year (184,613 ) (150,929 ) Balance at the end of the year ￦ 45,767 ￦ 61,393
Carrying Amounts Of Financial Assets By Category [Text Block]	Financial assets and liabilities are measured at fair value or amortized cost. The carrying amounts of financial assets and liabilities by category as of December 31, 2019 and 2020, are as follows: December 31, 2019 Financial Financial Financial Financial Derivatives Total (In millions of Korean won) Financial assets Cash and due from financial institutions ￦ — ￦ — ￦ — ￦ 20,837,878 ￦ — ￦ 20,837,878 Financial assets at fair value through profit or loss 53,549,086 — — — — 53,549,086 Derivatives 3,008,598 — — — 182,075 3,190,673 Loans measured at amortized cost — — — 339,684,059 — 339,684,059 Financial investments — 43,931,946 2,504,105 25,346,555 — 71,782,606 Other financial assets — — — 9,147,059 — 9,147,059 ￦ 56,557,684 ￦ 43,931,946 ￦ 2,504,105 ￦ 395,015,551 ￦ 182,075 ￦ 498,191,361 December 31, 2020 Financial Financial Financial Financial Derivatives Total (In millions of Korean won) Financial assets Cash and due from financial institutions ￦ — ￦ — ￦ — ￦ 25,608,842 ￦ — ￦ 25,608,842 Financial assets at fair value through profit or loss 61,035,455 — — — — 61,035,455 Derivatives 5,210,512 — — — 334,873 5,545,385 Loans measured at amortized cost — — — 377,166,984 — 377,166,984 Financial investments — 58,750,298 3,074,899 36,870,229 — 98,695,426 Other financial assets — — — 14,167,689 — 14,167,689 ￦ 66,245,967 ￦ 58,750,298 ￦ 3,074,899 ￦ 453,813,744 ￦ 334,873 ￦ 582,219,781
Carrying Amounts Of Financial Liabilities By Category [Text Block]	Financial assets and liabilities are measured at fair value or amortized cost. The carrying amounts of financial assets and liabilities by category as of December 31, 2019 and 2020, are as follows: December 31, 2019 Financial Financial instruments Financial Derivatives Total (In millions of Korean won) Financial liabilities Financial liabilities at fair value through profit or loss ￦ 2,663,327 ￦ 12,704,826 ￦ — ￦ — ￦ 15,368,153 Derivatives 2,842,950 — — 164,391 3,007,341 Deposits — — 305,592,771 — 305,592,771 Borrowings — — 37,818,860 — 37,818,860 Debentures — — 50,935,583 — 50,935,583 Other financial liabilities — — 22,629,587 — 22,629,587 ￦ 5,506,277 ￦ 12,704,826 ￦ 416,976,801 ￦ 164,391 ￦ 435,352,295 December 31, 2020 Financial Financial Financial Derivatives held Total (In millions of Korean won) Financial liabilities Financial liabilities at fair value through profit or loss ￦ 2,025,951 ￦ 9,784,107 ￦ — ￦ — ￦ 11,810,058 Derivatives 5,014,072 — — 208,825 5,222,897 Deposits — — 338,580,220 — 338,580,220 Borrowings — — 49,827,156 — 49,827,156 Debentures — — 62,760,687 — 62,760,687 Other financial liabilities — — 28,612,288 — 28,612,288 ￦ 7,040,023 ￦ 9,784,107 ￦ 479,780,351 ￦ 208,825 ￦ 496,813,306
Disclosure Of Continuing Involvement In Derecognised Financial Assets Explanatory	The Group transferred loans and other financial assets that are derecognized in their entirety, to SPEs (special purpose entities), while the maximum exposure to loss (carrying amount) from its continuing involvement and fair value of its continuing involvement of the derecognized financial assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 Type of continuing Classification of financial Carrying amount Fair value of (In millions of Korean won) Discovery 2nd Securitization Specialty Co., Ltd. Subordinated debt Financial assets at fair value through profit or loss ￦ 5,596 ￦ 5,596 FK 1411 ABS Ltd. Subordinated debt Financial assets at fair value through profit or loss 5,428 5,428 AP 3B ABS Ltd. Subordinated debt Financial assets at fair value through profit or loss 3,205 3,205 AP 4D ABS Ltd. Subordinated debt Financial assets at fair value through profit or loss 6,175 6,175 ￦ 20,404 ￦ 20,404 December 31, 2020 Type of continuing Classification of financial Carrying amount Fair value of (In millions of Korean won) Discovery 2nd Securitization Specialty Co., Ltd. Subordinated debt Financial assets at fair value through profit or loss ￦ 5,190 ￦ 5,190 FK 1411 ABS Ltd. Subordinated debt Financial assets at fair value through profit or loss 1,062 1,062 AP 3B ABS Ltd. Subordinated debt Financial assets at fair value through profit or loss 646 646 AP 4D ABS Ltd. Subordinated debt Financial assets at fair value through profit or loss 6,304 6,304 ￦ 13,202 ￦ 13,202
Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Explanatory	Transferred financial assets that are not derecognized in their entirety The Group securitized the loans and issued the asset-backed debentures. The senior debentures and related securitized assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 Carrying amount Fair value of Carrying amount Fair value of (In millions of Korean won) KB Kookmin Card 3 rd ￦ 601,659 ￦ 592,358 ￦ 351,207 ￦ 342,204 KB Kookmin Card 4 th 560,903 552,216 347,387 340,820 KB Kookmin Card 5 th 542,861 534,630 299,795 304,835 KB Kookmin Card 6 th 795,884 784,080 461,909 469,600 ￦ 2,501,307 ￦ 2,463,284 ￦ 1,460,298 ￦ 1,457,459 December 31, 2020 Carrying amount Fair value of Carrying amount Fair value of (In millions of Korean won) KB Kookmin Card 4 th ￦ 490,465 ￦ 488,251 ￦ 219,419 ￦ 226,401 KB Kookmin Card 5 th 476,523 474,481 299,838 304,914 KB Kookmin Card 6 th 701,360 698,421 434,492 472,861 KB Kookmin Card 7 th 924,159 919,775 553,711 591,609 ￦ 2,592,507 ￦ 2,580,928 ￦ 1,507,460 ￦ 1,595,785 * The Group has an obligation to early redeem the asset-backed debentures upon occurrence of an event specified in the agreement such as when the outstanding balance of the eligible asset-backed securitization (ABS), a trust-type ABS, is below the solvency margin ratio (minimum rate: 104.5%) of the beneficiary interest in the trust. To avoid such early redemption, the Group entrusts credit card accounts and deposits in addition to the previously entrusted credit card accounts. Bonds sold under repurchase agreements and loaned securities The Group continues to recognize the financial assets related to bonds sold under repurchase agreements and securities lending transactions in the consolidated statement of financial position since those transactions are not qualified for derecognition even though the Group transfers the financial assets. Bonds sold under repurchase agreements are sold on the condition that they will be repurchased at a fixed price and loaned securities will be returned at the expiration of the loan period. Thus, the Group retains substantially all the risks and rewards of ownership of the financial assets. The carrying amount of transferred assets and related liabilities as of December 31, 2019 and 2020, are as follows: December 31, 2019 Carrying amount of Carrying amount of (In millions of Korean won) Bonds sold under repurchase agreements* ￦ 9,292,858 ￦ 8,884,847 Loaned securities Government bond 2,259,096 — Stock 25,725 — ￦ 11,577,679 ￦ 8,884,847 December 31, 2020 Carrying amount of Carrying amount of (In millions of Korean won) Bonds sold under repurchase agreements* ￦ 13,994,352 ￦ 13,398,140 Loaned securities Government bond 1,831,673 — Stock 19,811 — ￦ 15,845,836 ￦ 13,398,140 * Bonds sold under repurchase agreements using borrowed securities as collateral amounts to ￦4,126,274 million and ￦ 2,147,975 million as of December 31, 2019 and 2020, respectively.
Disclosure Of Offsetting Of Financial Assets Explanatory	Details of financial assets subject to offsetting, enforceable master netting arrangements or similar agreements as of December 31, 2019 and 2020, are as follows: December 31, 2019 Gross assets Gross liabilities Net amounts in Non-offsetting Net amount Financial Cash (In millions of Korean won) Derivatives held for trading and derivatives linked securities ￦ 3,043,757 ￦ — ￦ 3,043,757 ￦ (2,122,160 ) ￦ (288,040 ) ￦ 815,632 Derivatives held for hedging 182,075 — 182,075 Receivable spot exchange 3,051,390 — 3,051,390 (3,050,116 ) — 1,274 Bonds purchased under repurchase agreements 6,507,646 — 6,507,646 (6,507,046 ) — 600 Domestic exchange settlement debits 31,344,009 (30,794,160 ) 549,849 — — 549,849 Other financial instruments 1,043,320 (1,022,977 ) 20,343 (2,492 ) — 17,851 ￦ 45,172,197 ￦ (31,817,137 ) ￦ 13,355,060 ￦ (11,681,814 ) ￦ (288,040 ) ￦ 1,385,206 December 31, 2020 Gross assets Gross liabilities Net amounts in Non-offsetting Net amount Financial Cash (In millions of Korean won) Derivatives held for trading and derivatives linked securities ￦ 5,425,708 ￦ — ￦ 5,425,708 ￦ (3,940,729 ) ￦ (263,564 ) ￦ 1,556,289 Derivatives held for hedging 334,874 — 334,874 Receivable spot exchange 3,435,657 — 3,435,657 (3,434,222 ) — 1,435 Bonds purchased under repurchase agreements 3,600,447 — 3,600,447 (3,600,447 ) — — Domestic exchange settlement debits 37,549,292 (36,823,836 ) 725,456 — — 725,456 Other financial instruments 4,560,879 (4,474,909 ) 85,970 — — 85,970 ￦ 54,906,857 ￦ (41,298,745 ) ￦ 13,608,112 ￦ (10,975,398 ) ￦ (263,564 ) ￦ 2,369,150
Disclosure Of Offsetting Of Financial Liabilities Explanatory	Details of financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreement as of December 31, 2019 and 2020, are as follows: December 31, 2019 Gross liabilities Gross assets Net amounts in Non-offsetting Net amount Financial Cash (In millions of Korean won) Derivatives held for trading and derivatives linked securities ￦ 2,936,638 ￦ — ￦ 2,936,638 ￦ (2,182,243 ) ￦ (92,565 ) ￦ 826,221 Derivatives held for hedging 164,391 — 164,391 Payable spot exchange 3,050,982 — 3,050,982 (3,034,679 ) — 16,303 Bonds sold under repurchase agreements* 13,011,121 — 13,011,121 (13,000,321 ) — 10,800 Securities borrowing agreements 2,583,092 — 2,583,092 (2,583,092 ) — — Domestic exchange settlement credits 32,867,423 (30,794,160 ) 2,073,263 (2,073,263 ) — — Other financial instruments 1,156,345 (1,022,977 ) 133,368 (2,492 ) — 130,876 ￦ 55,769,992 ￦ (31,817,137 ) ￦ 23,952,855 ￦ (22,876,090 ) ￦ (92,565 ) ￦ 984,200 December 31, 2020 Gross liabilities Gross assets Net amounts in Non-offsetting Net amount Financial Cash (In millions of Korean won) Derivatives held for trading and derivatives linked securities ￦ 5,300,028 ￦ — ￦ 5,300,028 ￦ (3,365,443 ) ￦ (77,324 ) ￦ 2,066,086 Derivatives held for hedging 208,825 — 208,825 Payable spot exchange 3,434,887 — 3,434,887 (3,434,222 ) — 665 Bonds sold under repurchase agreements* 16,329,799 (11,800 ) 16,317,999 (16,317,999 ) — — Securities borrowing agreements 1,934,736 — 1,934,736 (1,934,736 ) — — Domestic exchange settlement credits 37,757,164 (36,823,835 ) 933,329 (933,329 ) — — Other financial instruments 4,764,991 (4,474,909 ) 290,082 — — 290,082 ￦ 69,730,430 ￦ (41,310,544 ) ￦ 28,419,886 ￦ (25,985,729 ) ￦ (77,324 ) ￦ 2,356,833

Due From Financial Institutio_2

Due From Financial Institutions At Amortized Cost(Table)	12 Months Ended
	Dec. 31, 2020
Due From Financial Institution Abstract [Abstract]
Details Of Due From Financial Institutions Text Block [Text Block]	Details of due from financial institutions as of December 31, 2019 and 2020, are as follows: Financial institutions Interest rate December 31, 2019 December 31, 2020 (In millions of Korean won) Due from financial institutions in Korean won Due from the Bank of Korea The Bank of Korea 0.00 ￦ 8,117,840 ￦ 11,242,803 Due from banking institutions Hana Bank and others 0.00 ~ 1.90 4,641,714 3,692,044 Due from others NH Investment & Securities Co., Ltd. and others 0.00 ~ 1.63 654,981 753,581 13,414,535 15,688,428 Due from financial institutions in foreign currencies Due from banking institutions in foreign currencies Wells Fargo Bank N.A. and others 0.00 ~ 3.50 2,351,929 4,215,918 Time deposits in foreign currencies Bank of Shanghai, Beijing Branch and others 0.00 ~ 7.05 1,053,776 739,637 Due from others Societe Generale (Paris) and others 0.00 ~7.70 1,327,432 2,079,371 4,733,137 7,034,926 ￦ 18,147,672 ￦ 22,723,354 * Before netting of allowance
Disclosure Of Restricted Cash And Cash Equivalents Explanatory	Details of restricted due from financial institutions as of December 31, 2019 and 2020, are as follows: Financial institutions December 31, 2019 December 31, Reasons of restriction (In millions of Korean won) Due from financial institutions in Korean won Due from the Bank of Korea The Bank of Korea ￦ 8,117,840 ￦ 11,242,803 Bank of Korea Act Due from banking institutions Shinhan Bank and others 3,027,963 772,986 Net settlement and others Due from others NH Investment & Securities Co., Ltd. and others 555,294 545,457 Derivatives margin account and others 11,701,097 12,561,246 Due from financial institutions in foreign currencies Due from banking institutions in foreign currencies People’s Bank of China and others 490,071 1,097,729 Cambodian law and others Time deposits in foreign currencies Bank of Communications Co., Ltd. New York Branch 31,443 46,428 Bank Act of the State of New York and others Due from others Societe Generale (Paris) and others 1,150,355 1,597,960 Derivatives margin account and others 1,671,869 2,742,117 ￦ 13,372,966 ￦15,303,363 * Before netting of allowance
Disclosure Of Changes In The Allowances For Due From Financial Institutions Losses [Text Block]	Changes in allowances for credit losses of due from financial institutions for the years ended December 31, 2019 and 2020, are as follows: 2019 12-month Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 2,019 ￦ — ￦ — Transfer between stages Transfer to 12-month — — — Transfer to lifetime expected credit losses — — — Impairment — — — Disposal — — — Provision for credit losses 1,116 1,210 360 Others 29 (22 ) — Ending ￦ 3,164 ￦ 1,188 ￦ 360 2020 12-month Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 3,164 ￦ 1,188 ￦ 360 Transfer between stages Transfer to 12-month — — — Transfer to lifetime expected credit losses — — — Impairment — — — Disposal — — — Reversal of credit losses (416 ) (1,128 ) — Business combination 154 — — Others 45 (26 ) (78 ) Ending ￦ 2,947 ￦ 34 ￦ 282

Assets Pledged As Collateral(Ta

Assets Pledged As Collateral(Table)	12 Months Ended
	Dec. 31, 2020
Pledged Assets Abstract [Abstract]
Schedule Of Financial Instruments Owned And Pledged As Collateral Text Block [Text Block]	Details of assets pledged as collateral as of December 31, 2019 and 2020, are as follows: December 31, 2019 Assets pledged Pledgee Carrying amount Reasons of pledge (In millions of Due from financial institutions Korea Federation of Savings Banks and others ￦ 3,752,497 Borrowings from bank and others Financial assets at fair value through profit or loss The Korea Securities Depository and others 7,561,287 Repurchase agreements The Korea Securities Depository and others 7,745,154 Securities borrowing transactions Samsung Futures Inc. and others 1,090,495 Derivatives transactions 16,396,936 Financial assets at fair value through other comprehensive income The Korea Securities Depository and others 1,139,852 Repurchase agreements The Korea Securities Depository and others 1,168,515 Securities borrowing transactions The Bank of Korea 1,212,021 Borrowings from the Bank of Korea The Bank of Korea 653,825 Settlement risk of the Bank of Korea Samsung Futures Inc. and others 167,600 Derivatives transactions 4,341,813 Securities measured at amortized cost The Korea Securities Depository and others 581,268 Repurchase agreements The Bank of Korea 1,767,559 Borrowings from the Bank of Korea The Bank of Korea 3,077,151 Settlement risk of the Bank of Korea Samsung Futures Inc. and others 247,301 Derivatives transactions Others 494,785 Others 6,168,064 Mortgage loans Others 6,487,022 Covered bond Real estate NATIXIS REAL ESTATE CAPITAL LLC and others 1,665,368 Borrowings from bank and others ￦ 38,811,700 December 31, 2020 Assets pledged Pledgee Carrying amount Reasons of pledge (In millions of Due from financial institutions Korea Federation of Savings Banks and others ￦ 1,293,930 Borrowings from bank and others Financial assets at fair value through profit or loss The Korea Securities Depository and others 10,733,047 Repurchase agreements The Korea Securities Depository and others 7,009,580 Securities borrowing transactions Samsung Futures Inc. and others 730,774 Derivatives transactions 18,473,401 Financial assets at fair value through other comprehensive income The Korea Securities Depository and others 2,216,165 Repurchase agreements The Korea Securities Depository and others 1,322,998 Securities borrowing transactions The Bank of Korea 2,837,452 Borrowings from the Bank of Korea The Bank of Korea 1,610,691 Settlement risk of the Bank of Korea Samsung Futures Inc. and others 270,089 Derivatives transactions 8,257,395 Securities measured at amortized cost The Korea Securities Depository and others 664,438 Repurchase agreements The Bank of Korea 4,295,149 Borrowings from the Bank of Korea The Bank of Korea 3,677,922 Settlement risk of the Bank of Korea Samsung Futures Inc. and others 103,748 Derivatives transactions Others 598,187 Others 9,339,444 Mortgage loans Others 10,699,721 Covered bond Real estate LGIM COMMERCIAL LENDING Ltd and others 1,480,942 Borrowings from bank and others ￦ 49,544,833 In addition, the Group provided ￦ 7,320,220 million and ￦ 4,680,816 million of its borrowed securities and assets held as collateral to Korea Securities Finance Corporation and others as collateral as of December 31, 2019 and 2020, respectively.
The Fair Values Of Collateral Available To Sell Or Repledge And Collateral Sold Or Repledged [Text Block]	Fair value of collateral available to sell or repledge, and collateral sold or repledged, regardless of debtor’s default as of December 31, 2019 and 2020, are as follows: December 31, 2019 Fair value of collateral Fair value of collateral Total (In millions of Korean won) Securities ￦ 6,726,632 ￦ — ￦ 6,726,632 December 31, 2020 Fair value of collateral Fair value of collateral Total (In millions of Korean won) Securities ￦ 3,732,013 ￦ — ￦ 3,732,013

Derivative Financial Instrume_2

Derivative Financial Instruments and Hedge Accounting(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Hedge Accounting Abstract [Abstract]
Disclosure of derivative financial instruments [Text Block]	Details of derivative financial instruments held for trading as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 Notional amount Assets Liabilities Notional amount Assets Liabilities (In millions of Korean won) Interest rate Forwards ￦ 570,000 ￦ 206 ￦ 84,126 ￦ 1,824,000 ￦ 50,580 ￦ 107,218 Futures* 2,951,770 698 235 4,540,235 43 1,834 Swaps 270,091,778 512,145 557,511 300,105,350 631,917 682,401 Options 17,521,156 267,697 379,262 14,779,000 248,437 302,134 291,134,704 780,746 1,021,134 321,248,585 930,977 1,093,587 Currency Forwards 87,373,417 942,632 750,380 78,255,991 1,712,560 1,986,239 Futures* 107,793 — 349 376,281 158 695 Swaps 46,501,399 606,464 610,275 49,756,478 1,897,636 1,349,919 Options 2,789,562 5,438 14,346 2,377,775 33,421 28,012 136,772,171 1,554,534 1,375,350 130,766,525 3,643,775 3,364,865 Stock and index Futures* 1,646,785 22,451 20,704 1,027,347 20,061 2,246 Swaps 6,773,467 448,803 86,100 5,434,057 423,297 123,242 Options 5,559,865 99,013 176,141 6,482,510 135,805 275,282 13,980,117 570,267 282,945 12,943,914 579,163 400,770 Credit Swaps 4,433,960 19,178 13,659 3,015,782 19,395 9,700 4,433,960 19,178 13,659 3,015,782 19,395 9,700 Commodity Futures* 3,281 68 3 11,609 151 81 Swaps 105,658 2,948 474 13,923 268 991 108,939 3,016 477 25,532 419 1,072 Other 3,160,013 80,857 149,385 1,476,310 36,783 144,076 ￦ 449,589,904 ￦ 3,008,598 ￦ 2,842,950 ￦ 469,476,648 ￦ 5,210,512 ￦ 5,014,070 * Gains or losses arising from daily mark-to-market Details of derivative instruments designated as fair value hedge as of and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019 2019 Notional amount Assets Liabilities Changes in fair value (In millions of Korean won) Interest rate Swaps ￦ 5,326,500 ￦ 129,085 ￦ 29,676 ￦ 101,448 Currency Forwards 2,218,789 22,503 27,862 (74,372) ￦ 7,545,289 ￦ 151,588 ￦ 57,538 ￦ 27,076 December 31, 2020 2020 Notional amount Assets Liabilities Changes in fair value (In millions of Korean won) Interest rate Swaps ￦ 9,217,731 ￦ 158,914 ￦ 51,842 ￦ (23,022 ) Currency Forwards 2,172,192 128,038 2,616 97,394 ￦ 11,389,923 ￦ 286,952 ￦ 54,458 ￦ 74,372 Details of derivative instruments designated as cash flow hedge as of and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019 2019 Notional Assets Liabilities Changes in fair value (In millions of Korean won) Interest rate Swaps ￦ 3,600,334 ￦ 3,698 ￦ 28,484 ￦ (25,997 ) Currency Swaps 2,613,901 23,382 73,067 (38,534 ) ￦ 6,214,235 ￦ 27,080 ￦ 101,551 ￦ (64,531 ) December 31, 2020 2020 Notional Assets Liabilities Changes in fair value (In millions of Korean won) Interest rate Swaps ￦ 3,532,480 ￦ 1,286 ￦ 37,120 ￦ (11,940 ) Currency Swaps 2,857,435 40,835 116,124 (43,300 ) ￦ 6,389,915 ￦ 42,121 ￦ 153,244 ￦ (55,240 ) Details of financial instruments designated as hedge of net investments in foreign operations as of and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019 2019 Notional Amount Assets Liabilities Changes in fair value (In millions of Korean won) Currency Forwards ￦ 275,569 ￦ 3,407 ￦ 5,302 ￦ (10,330 ) Debentures in foreign currencies 97,255 — 97,255 (3,080 ) ￦ 372,824 ￦ 3,407 ￦ 102,557 ￦ (13,410 ) December 31, 2020 2020 Notional amount Assets Liabilities Changes in fair value (In millions of Korean won) Currency Forwards ￦ 243,957 ￦ 5,800 ￦ 1,125 ￦ 14,406 Debentures in foreign currencies 842,112 — 842,112 74,363 ￦ 1,086,069 ￦ 5,800 ￦ 843,237 ￦ 88,769
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Text Block]	Average price condition of future nominal cash flows by type of hedge accounting as of December 31, 2019 and 2020, are as follows: December 31, 2019 1 year 2 years 3 years 4 years 5 years Over 5 years Total (In millions of Korean won) Fair value hedge Nominal amount of the hedging instrument ￦ 2,649,272 ￦ 1,807,950 ￦ 897,562 ￦ 309,882 ￦ 466,053 ￦ 1,414,570 ￦ 7,545,289 Average price condition (%) 2.29 2.70 2.29 3.16 2.50 3.92 2.91 Average price condition (USD/KRW) 1,149.90 1,138.82 1,094.35 — — — 1,146.84 Average price condition (EUR/KRW) 1,319.66 1,346.38 — — — — 1,327.68 Average price condition (AUD/KRW) 803.71 — — — — — 803.71 Cash flow hedge Nominal amount of the hedging instrument ￦ 2,450,918 ￦ 1,199,124 ￦ 1,764,991 ￦ 529,202 ￦ 120,000 ￦ 150,000 ￦ 6,214,235 Average price condition (%) 2.64 2.56 2.66 2.79 2.00 1.67 2.59 Average price condition (USD/KRW) 1,129.58 1,111.66 1,153.15 1,095.73 — — 1,132.99 Average price condition (EUR/KRW) 1,305.22 1,306.76 1,312.75 — — — 1,306.91 Average price condition (AUD/KRW) — 837.00 — — — — 837.00 Average price condition (SGD/KRW) 815.80 831.49 — — — — 823.54 Hedge of net investments in foreign operations Nominal amount of the hedging instrument ￦ 248,233 ￦ — ￦ 27,336 ￦ — ￦ — ￦ — ￦ 275,569 Average price condition (USD/KRW) 1,151.49 — — — — — 1,151.49 Average price condition (GBP/KRW) — — 1,465.26 — — — 1,465.26 December 31, 2020 1 year 2 years 3 years 4 years 5 years Over 5 years Total (In millions of Korean won) Fair value hedge Nominal amount of the hedging instrument ￦ 5,266,994 ￦ 1,083,877 ￦ 512,608 ￦ 620,788 ￦ 1,462,964 ￦ 2,442,692 ￦ 11,389,923 Average price condition (%) 0.76 0.81 1.00 1.07 1.21 1.14 0.97 Average price condition (USD/KRW) 1,160.33 1,115.45 1,151.50 — — — 1,157.28 Average price condition (EUR/KRW) 1,353.28 — 1,366.30 — — — 1,353.36 Average price condition (AUD/KRW) 835.43 — — — — — 835.43 Average price condition (GBP/KRW) 1,546.54 — — — — — 1,546.54 Cash flow hedge Nominal amount of the hedging instrument ￦ 2,568,922 ￦ 1,767,357 ￦ 1,277,053 ￦ 166,643 ￦ 509,940 ￦ 100,000 ￦ 6,389,915 Average price condition (%) 0.83 1.66 2.48 2.00 1.63 1.67 1.36 Average price condition (USD/KRW) 1,113.33 1,160.46 1,181.36 1,128.30 1,142.05 — 1,152.37 Average price condition (EUR/KRW) 1,306.76 1,312.75 1,321.00 — 1,340.64 — 1,312.93 Average price condition (AUD/KRW) 837.00 — — — — — 837.00 Average price condition (SGD/KRW) 831.49 — 866.14 — — — 858.33 Hedge of net investments in foreign operations Nominal amount of the hedging instrument ￦ 217,274 ￦ 26,683 ￦ — ￦ — ￦ — ￦ — ￦ 243,957 Average price condition (USD/KRW) 1,111.45 — — — — — 1,111.45 Average price condition (GBP/KRW) — 1,465.26 — — — — 1,465.26
Disclosure of detailed information about hedged items [Text Block]	Details of fair value hedged items as of and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019 2019 Carrying amount Accumulated amount of Changes in fair value Assets Liabilities Assets Liabilities (In millions of Korean won) Hedge accounting Interest rate Debt securities in Korean won ￦ 549,526 ￦ — ￦ 5,485 ￦ — ￦ 5,502 Debt securities in foreign currencies 1,670,838 — 19,243 — 25,540 Deposits in foreign currencies — 780,491 — (18,391 ) (62,439 ) Debentures in Korean won — 351,070 — 21,070 (1,818 ) Debentures in foreign currencies — 2,067,556 — 41,406 (65,480 ) 2,220,364 3,199,117 24,728 44,085 (98,695 ) Currency Debt securities in foreign currencies 2,339,239 — 24,181 — 61,133 2,339,239 — 24,181 — 61,133 ￦ 4,559,603 ￦ 3,199,117 ￦ 48,909 ￦ 44,085 ￦ (37,562 ) December 31, 2020 2020 Carrying amount Accumulated amount of Changes in fair value Assets Liabilities Assets Liabilities (In millions of Korean won) Hedge accounting Interest rate Debt securities in Korean won ￦ 1,001,957 ￦ — ￦ 5,888 ￦ — ￦ 402 Debt securities in foreign currencies 2,712,980 — 62,922 — 42,382 Deposits in foreign currencies — 121,768 — 2,088 (4,491 ) Debentures in Korean won — 3,623,161 — (6,839 ) 27,909 Debentures in foreign currencies — 1,985,333 — 81,333 (37,438 ) 3,714,937 5,730,262 68,810 76,582 28,764 Currency Debt securities in foreign currencies 2,669,410 — 310,745 — (40,710 ) 2,669,410 — 310,745 — (40,710 ) ￦ 6,384,347 ￦ 5,730,262 ￦ 379,555 ￦ 76,582 ￦ (11,946 )
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [Text Block]	Details of hedge ineffectiveness recognized in profit or loss from derivatives for the years ended December 31, 2018, 2019 and 2020, are as follows: Hedge ineffectiveness recognized in profit or loss (In millions of Korean won) 2018 2019 2020 Hedge accounting Interest rate ￦ 1,186 ￦ 2,753 ￦ 5,742 Currency (20,694 ) (13,239 ) 56,684 ￦ (19,508 ) ￦ (10,486 ) ￦ 62,426 Gains or losses from fair value hedging instruments and hedged items attributable to the hedged risk for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Gains (losses) on hedging instruments ￦ (160,416 ) ￦ 34,070 ￦ 89,179 Gains (losses) on the hedged items attributable to the hedged risk 135,556 (44,655 ) (26,899 ) ￦ (24,860 ) ￦ (10,585 ) ￦ 62,280 Details of cash flow hedged items as of and for the years ended December 31, 2019 and 2020, are as follows: Cash flow hedge reserve Changes in fair value December 31, 2019 December 31, 2020 2019 2020 (In millions of Korean won) Hedge accounting Interest rate risk ￦ (15,670 ) ￦ (22,439 ) ￦ 25,671 ￦ 12,172 Foreign currency change risk (11,663 ) (6,158 ) 42,357 1,065 ￦ (27,333 ) ￦ (28,597 ) ￦ 68,028 ￦ 13,237 Gains or losses from cash flow hedging instruments and hedged items attributable to the hedged risk for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Losses on hedging instruments ￦ (23,022) ￦ (64,531) ￦ (55,240) Effective portion of losses on cash flow hedging instruments (amount recognized in other comprehensive income) (24,672 ) (65,323 ) (48,034 ) Ineffective portion of losses on cash flow hedging instruments (amount recognized in profit or loss) 1,650 792 (7,206 ) Amounts recognized in other comprehensive income (loss) and reclassified from equity to profit or loss for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Other comprehensive loss ￦ (24,672 ) ￦ (65,323 ) ￦ (48,034 ) Reclassification to profit or loss 15,234 21,604 39,190 Income tax effect 400 10,537 7,580 ￦ (9,038 ) ￦ (33,182 ) ￦ (1,264 ) Details of net investments in foreign operations hedged items as of and for the years ended December 31, 2019 and 2020, are as follows: Foreign currency translation reserve Changes in fair value December 31, 2019 December 31, 2020 2019 2020 (In millions of Korean won) Hedge accounting Currency (foreign currency exchange risk) ￦ (41,992 ) ￦ 22,278 ￦ 13,410 ￦ (88,769 )
Schedule Of Fair Value Of Non Derivative Financial Instruments Designated As Hedging Instruments Table Text Block [Text Block]	Fair value of non-derivative financial instruments designated as hedge of net investments in foreign operations as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Debentures in foreign currencies ￦ 97,737 ￦ 852,570
Disclosure of Gains or losses from hedging instruments and hedged items attributable to the hedged risk [Text Block]	Gains or losses from hedging instruments in hedge of net investments in foreign operations and hedged items attributable to the hedged risk for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Gains (losses) on hedging instruments ￦ (25,096 ) ￦ (13,410 ) ￦ 88,769 Effective portion of gains (losses) on hedge of net investments in foreign operations (amount recognized in other comprehensive income) (25,096 ) (13,410 ) 88,769 Ineffective portion of gains (losses) on hedge of net investments in foreign operations (amount recognized in profit or loss) — — —
Disclosure of Effective portion of gains or losses on hedging instruments recognized in other comprehensive income [Text Block]	Amounts recognized in other comprehensive income (loss) and reclassified from equity to profit or loss for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Other comprehensive loss ￦ (24,672 ) ￦ (65,323 ) ￦ (48,034 ) Reclassification to profit or loss 15,234 21,604 39,190 Income tax effect 400 10,537 7,580 ￦ (9,038 ) ￦ (33,182 ) ￦ (1,264 )
Disclosure of Exposure to hedging relationships related to the interest rate benchmark reform [Text Block]	The Group’s exposure to hedging relationships related to the interest rate benchmark reform as of December 31, 2020, is as follows. The USD LIBOR interest rate will be replaced by the Secured Overnight Financing Rate (“SOFR”) based on actual transactions starting in 2022 and the KRW CD rate is currently under consideration for improving the calculation methodology. In this hedging relationship, the Group assumed that the spread to be changed on a SOFR basis in 2022 would be similar to that included in the interest rate swap used as a hedging instrument, and no other changes were assumed. December 31, 2020 Interest rate benchmark Currency Carrying amount of non-derivative assets Carrying amount of non-derivative liabilities Notional amount of (In millions of Korean won and millions of US dollars) CD#3M KRW 1,807,701 3,623,161 5,430,000 USD#LIBOR#3M USD 78,083 3,276 82,907 USD#LIBOR#6M USD 213 10 206

Loans Measured At Amortized C_2

Loans Measured At Amortized Cost(Table)	12 Months Ended
	Dec. 31, 2020
Trade And Other Receivables Abstract [Abstract]
Schedule Of Details Of Loans Table Text Block [Text Block]	Details of loans as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Loans measured at amortized cost ￦ 341,363,805 ￦ 379,734,020 Deferred loan origination fees and costs 728,270 716,327 Less: Allowances for credit losses (2,408,016 ) (3,283,363 ) Carrying amount ￦ 339,684,059 ￦ 377,166,984
Schedule Of Details Of Loans For Other Banks Table Text Block [Text Block]	Details of loans to banks as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Loans measured at amortized cost ￦ 4,011,246 ￦ 5,577,728 Less: Allowances for credit losses (432 ) (682 ) Carrying amount ￦ 4,010,814 ￦ 5,577,046
Schedule Of Details Of Loan Types And Customer Types Of Loans Other Than Banks Table Text Block [Text Block]	Details of loan types and customer types of loans to customers other than banks as of December 31, 2019 and 2020, are as follows: December 31, 2019 Retail Corporate Credit card Total (In millions of Korean won) Loans in Korean won ￦ 159,232,495 ￦ 130,383,260 ￦ — ￦ 289,615,755 Loans in foreign currencies 433,399 8,125,029 — 8,558,428 Domestic import usance bills — 2,617,862 — 2,617,862 Off-shore — 1,387,798 — 1,387,798 Call loans — 610,001 — 610,001 Bills bought in Korean won — 2,843 — 2,843 Bills bought in foreign currencies — 2,158,877 — 2,158,877 Guarantee payments under acceptances and guarantees 36 3,312 — 3,348 Credit card receivables in Korean won — — 18,642,111 18,642,111 Credit card receivables in foreign currencies — — 6,299 6,299 Bonds purchased under repurchase agreements — 6,149,458 — 6,149,458 Privately placed bonds — 971,414 — 971,414 Factored receivables 117 167 — 284 Lease receivables 1,385,617 194,576 — 1,580,193 Loans for installment credit 5,737,458 38,700 — 5,776,158 166,789,122 152,643,297 18,648,410 338,080,829 Proportion (%) 49.33 45.15 5.52 100.00 Less: Allowances for credit losses (711,322 ) (956,554 ) (739,708 ) (2,407,584 ) ￦ 166,077,800 ￦ 151,686,743 ￦ 17,908,702 ￦ 335,673,245 December 31, 2020 Retail Corporate Credit card Total (In millions of Korean won) Loans in Korean won ￦ 175,062,187 ￦ 142,812,751 ￦ — ￦ 317,874,938 Loans in foreign currencies 3,092,630 16,159,722 — 19,252,352 Domestic import usance bills — 2,152,059 — 2,152,059 Off-shore — 1,203,737 — 1,203,737 Call loans — 1,582,251 — 1,582,251 Bills bought in Korean won — 1,620 — 1,620 Bills bought in foreign currencies — 1,739,262 — 1,739,262 Guarantee payments under acceptances and guarantees 10 8,011 — 8,021 Credit card receivables in Korean won — — 18,734,560 18,734,560 Credit card receivables in foreign currencies — — 63,071 63,071 Bonds purchased under repurchase agreements — 3,175,080 — 3,175,080 Privately placed bonds — 1,154,162 — 1,154,162 Factored receivables 104 3 — 107 Lease receivables 1,105,001 335,582 — 1,440,583 Loans for installment credit 6,440,521 50,295 — 6,490,816 185,700,453 170,374,535 18,797,631 374,872,619 Proportion (%) 49.54 45.45 5.01 100.00 Less: Allowances for credit losses (910,088 ) (1,671,098 ) (701,495 ) (3,282,681 ) ￦ 184,790,365 ￦ 168,703,437 ￦ 18,096,136 ￦ 371,589,938
Schedule Of Changes In Deffered Loan Origination Fees And Costs Table Text Block [Text Block]	Changes in deferred loan origination fees and costs for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Increase Decrease Others Ending (In millions of Korean won) Deferred loan origination costs Loans in Korean won ￦ 664,237 ￦ 387,420 ￦ (406,352 ) ￦ — ￦ 645,305 Others 119,780 56,030 (79,432 ) — 96,378 784,017 443,450 (485,784 ) — 741,683 Deferred loan origination fees Loans in Korean won 9,055 7,238 (7,693 ) — 8,600 Others 21,836 3,415 (20,439 ) 1 4,813 30,891 10,653 (28,132 ) 1 13,413 ￦ 753,126 ￦ 432,797 ￦ (457,652 ) ￦ (1 ) ￦ 728,270 2020 Beginning Increase Decrease Business combination Others Ending (In millions of Korean won) Deferred loan origination costs Loans in Korean won ￦ 645,305 ￦ 502,044 ￦ (473,392 ) ￦ — ￦ — ￦ 673,957 Others 1 96,378 53,345 (63,509 ) 9,376 — 95,590 741,683 555,389 (536,901 ) 9,376 — 769,547 Deferred loan origination fees Loans in Korean won 8,600 6,681 (6,133 ) — — 9,148 Others 2 4,813 21,636 (26,396 ) 48,117 (4,098 ) 44,072 13,413 28,317 (32,529 ) 48,117 (4,098 ) 53,220 ￦ 728,270 ￦ 527,072 ￦ (504,372 ) ￦ (38,741 ) ￦ 4,098 ￦ 716,327 1 Includes deferred loan origination costs to credit card receivables, loans for installment credit and financial lease receivables. 2 Includes deferred loan origination fees to loans in foreign currencies from PT Bank Bukopin TBK and PRASAC Microfinance Institution Limited.

Allowances for Credit Losses(Ta

Allowances for Credit Losses(Table)	12 Months Ended
	Dec. 31, 2020
Reconciliation Of Changes In Allowance Account For Credit Losses Of Financial Assets Abstract [Abstract]
Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans [Text Block]	Changes in allowances for credit losses of loans measured at amortized cost for the years ended December 31, 2019 and 2020, are as follows: 2019 Retail Corporate Credit card 12-month Lifetime expected credit 12-month Lifetime expected credit 12-month Lifetime expected credit Non-impaired Impaired Non-impaired Impaired Non-impaired Impaired (In millions of Korean won) Beginning ￦ 237,440 ￦ 215,743 ￦ 189,714 ￦ 214,312 ￦ 318,656 ￦ 722,875 ￦ 180,467 ￦ 290,025 ￦ 240,449 Transfer between stages Transfer to 12-month 168,460 (167,957 ) (503 ) 59,848 (46,312 ) (13,536 ) 51,542 (50,627 ) (915 ) Transfer to lifetime expected credit losses (144,590 ) 160,509 (15,919 ) (53,696 ) 141,398 (87,702 ) (23,537 ) 24,529 (992 ) Impairment (1,619 ) (54,736 ) 56,355 (2,250 ) (36,656 ) 38,906 (2,388 ) (14,377 ) 16,765 Write-offs (2 ) 24 (443,034 ) — 2 (239,319 ) — — (506,255 ) Sales (486 ) (70 ) (782 ) — — (8,909 ) — — — Provision (reversal) for credit losses 1,2 19,152 71,231 424,758 (3,540 ) (89,234 ) 80,216 3,567 16,633 524,652 Others (exchange differences, etc.) 25 161 (2,552 ) 395 2,456 (40,924 ) — — (9,830 ) Ending ￦ 278,380 ￦ 224,905 ￦ 208,037 ￦ 215,069 ￦ 290,310 ￦ 451,607 ￦ 209,651 ￦ 266,183 ￦ 263,874 2020 Retail Corporate Credit card 12-month Lifetime expected credit losses 12-month Lifetime expected credit losses 12-month Lifetime expected credit losses Non-impaired Impaired Non-impaired Impaired Non-impaired Impaired (In millions of Korean won) Beginning ￦ 278,380 ￦ 224,905 ￦ 208,037 ￦ 215,069 ￦ 290,310 ￦ 451,607 ￦ 209,651 ￦ 266,183 ￦ 263,874 Transfer between stages Transfer to 12-month 123,666 (121,970 ) (1,696 ) 119,723 (111,708 ) (8,015 ) 48,959 (47,611 ) (1,348 ) Transfer to lifetime expected credit losses (91,410 ) 182,076 (90,666 ) (56,655 ) 146,690 (90,035 ) (25,227 ) 26,379 (1,152 ) Impairment (3,301 ) (131,852 ) 135,153 (3,365 ) (48,773 ) 52,138 (2,273 ) (13,657 ) 15,930 Write-offs — (5 ) (460,734 ) — (1 ) (321,583 ) — — (502,275 ) Sales (1,561 ) (99 ) (1,131 ) (8 ) — (21,069 ) — — — Provision (reversal) for credit losses 1,2,3 49,459 78,413 428,220 (2,059 ) 113,335 180,162 (26,042 ) 2,925 496,162 Business combination 50,664 9,545 53,532 99,824 24,303 668,426 89 — 4,409 Others (exchange differences, etc.) (2,092 ) (435 ) (5,010 ) (3,747 ) (3,219 ) (19,570 ) — — (13,481 ) Ending ￦ 403,805 ￦ 240,578 ￦ 265,705 ￦ 368,782 ￦ 410,937 ￦ 892,061 ￦ 205,157 ￦ 234,219 ￦ 262,119 1 Provision for credit losses in the consolidated statements of comprehensive income also include provision (reversal) for credit losses of due from financial institutions (Note 7.3), and provision (reversal) for credit losses of financial investments (Note 12.5), provision for credit losses of unused commitments and guarantees (Note 24.2), provision (reversal) for credit losses of financial guarantees contracts (Note 24.3), and provision (reversal) for credit losses of other financial assets (Note 19.2). 2 Includes ￦ 390,041 million and ￦ 379,179 million of collections from written-off 3 Includes additional provision of ￦ 43,777 million for industries and borrowers which are highly affected by COVID-19, (non-impaired) The Group manages the written-off
Disclosure Of Changes In The Book Value Of Loans At Amortized Cost[Text Block]	Changes in gross carrying amount of loans for the years ended December 31, 2019 and 2020, are as follows: 2019 12-month credit losses Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 293,296,370 ￦ 26,417,165 ￦ 2,097,749 Transfer between stages Transfer to 12-month 54,530,173 (54,412,664 ) (117,509 ) Transfer to lifetime expected credit losses (non-impaired) (57,514,696 ) 58,078,679 (563,983 ) Transfer to lifetime expected credit losses (impaired) (564,375 ) (1,792,641 ) 2,357,016 Write-offs (2 ) 26 (1,188,608 ) Sales (889,880 ) (18,163 ) (188,080 ) Net increase (decrease) (execution, repayment and others) 27,519,419 (4,458,294 ) (495,627 ) Ending ￦ 316,377,009 ￦ 23,814,108 ￦ 1,900,958 2020 12-month credit losses Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 316,377,009 ￦ 23,814,108 ￦ 1,900,958 Transfer between stages Transfer to 12-month 26,751,021 (26,629,210 ) (121,811 ) Transfer to lifetime expected credit losses (non-impaired) (33,475,491 ) 34,603,648 (1,128,157 ) Transfer to lifetime expected credit losses (impaired) (596,861 ) (2,287,196 ) 2,884,057 Write-offs — (6 ) (1,284,592 ) Sales (4,324,146 ) (20,907 ) (200,182 ) Business combination 7,029,580 570,710 1,711,823 Net increase (decrease) (execution, repayment and others) 36,757,668 (1,546,945 ) (334,731 ) Ending ￦ 348,518,780 ￦ 28,504,202 ￦ 3,427,365

Financial Assets At Fair Valu_2

Financial Assets At Fair Value Through Profit Or Loss And Financial Investments(Table)	12 Months Ended
	Dec. 31, 2020
Current Financial Assets At Fair Value Through Profit Or Loss Abstract [Abstract]
Schedule Of Financial Assets At Fair Value Through Profit Or Loss And Financial Investments Table Text Block [Text Block]	Details of financial assets at fair value through profit or loss and financial investments as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Financial assets at fair value through profit or loss Debt securities: Government and public bonds ￦ 6,569,472 ￦ 9,315,317 Financial bonds 16,360,495 17,897,348 Corporate bonds 3,218,480 3,997,753 Asset-backed securities 124,898 236,130 Beneficiary certificates 12,375,326 14,200,802 Derivatives linked securities 3,623,648 2,218,502 Other debt securities 8,449,207 10,549,248 Equity securities: Stocks 1,716,149 1,632,619 Other equity securities 387,694 459,694 Loans: Privately placed bonds 265,499 212,021 Other loans 162,046 125,962 Due from financial institutions: Other due from financial institutions 216,367 100,094 Others 79,805 89,965 ￦ 53,549,086 ￦ 61,035,455 Financial Investments Financial assets at fair value through other comprehensive income Debt securities: Government and public bonds ￦ 9,501,642 ￦ 14,735,340 Financial bonds 20,913,361 23,194,387 Corporate bonds 12,289,820 18,721,327 Asset-backed securities 832,160 1,795,840 Other debt securities 19,865 9,995 Equity securities: Stocks 2,377,994 2,852,158 Equity investments 41,042 37,602 Other equity securities 85,069 185,139 Loans: Privately placed bonds 375,098 265,426 Other loans — 27,983 46,436,051 61,825,197 Financial assets at amortized cost Debt securities: Government and public bonds 5,395,720 17,193,289 Financial bonds 8,157,428 5,678,949 Corporate bonds 7,536,805 8,181,961 Asset-backed securities 4,258,274 5,788,587 Other debt securities — 30,392 Allowances for credit losses (1,672 ) (2,949 ) 25,346,555 36,870,229 ￦ 71,782,606 ￦ 98,695,426
Disclosure Of Dividend Incomes From The Equity Securities Measured At Fair Value Through Other Comprehensive Income [Text Block]	Dividend income from equity securities designated at fair value through other comprehensive income for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 From the financial assets From the remaining financial assets From the financial assets From the (In millions of Korean won) Equity securities measured at fair value through other comprehensive income Stocks Listed ￦ — ￦ 26,121 ￦ 7,000 ￦ 11,843 Unlisted — 25,599 — 22,241 Equity investments — 95 — 285 Other equity securities — 2,953 — 3,755 ￦ — ￦ 54,768 ￦ 7,000 ￦ 38,124
Disclosure Of Derecognized Equity Securities Measured At Fair Value Through Other Comprehensive Income [Text Block]	Derecognized equity securities measured at fair value through other comprehensive income for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 Disposal price Accumulated disposal date Disposal price Accumulated disposal date (In millions of Korean won) Equity securities measured at fair value through other comprehensive income Stocks Listed ￦ 18,342 ￦ (25,652 ) ￦ 516,883 ￦ 326,394 Unlisted 1,671 169 13 13 Equity investments — — 3 3 ￦ 20,013 ￦ (25,483 ) ￦ 516,899 ￦ 326,410
Disclosure Of Provision And Reversal For The Allowance Of Financial Investments [Text Block]	Provision (reversal) for credit losses of financial investments for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 Provision Reversal Total (In millions of Korean won) Securities measured at fair value through other comprehensive income ￦ 860 ￦ (873 ) ￦ (13 ) Loans measured at fair value through other comprehensive income 963 (826 ) 137 Securities measured at amortized cost 296 (282 ) 14 ￦ 2,119 ￦ (1,981 ) ￦ 138 2019 Provision Reversal Total (In millions of Korean won) Securities measured at fair value through other comprehensive income ￦ 1,537 ￦ (1,144 ) ￦ 393 Loans measured at fair value through other comprehensive income 170 (982 ) (812 ) Securities measured at amortized cost 216 (280 ) (64 ) ￦ 1,923 ￦ (2,406 ) ￦ (483 ) 2020 Provision Reversal Total (In millions of Korean won) Securities measured at fair value through other comprehensive income ￦ 4,297 ￦ (229 ) ￦ 4,068 Loans measured at fair value through other comprehensive income 202 (316 ) (114 ) Securities measured at amortized cost 1,916 (636 ) 1,280 ￦ 6,415 ￦ (1,181 ) ￦ 5,234
Disclosure Of Changes In The Allowances For Debt Securities [Text Block]	Changes in allowances for credit losses of financial investments for the years ended December 31, 2019 and 2020, are as follows: 2019 12-month expected credit losses Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 5,657 ￦ 192 ￦ 322 Transfer between stages Transfer to 12-month 437 (188 ) (249 ) Transfer to lifetime expected credit losses (669 ) 669 — Sales (329 ) — — Provision (reversal) for credit losses 219 (702 ) — Others 55 29 (73 ) Ending ￦ 5,370 ￦ — ￦ — 2020 12-month expected credit losses Lifetime expected credit losses Non-impaired Impaired (In millions of Korean won) Beginning ￦ 5,370 ￦ — ￦ — Transfer between stages Transfer to 12-month — — — Transfer to lifetime expected credit losses — — — Sales (589 ) — — Provision for credit losses 5,195 39 — Others (68 ) — 73 Ending ￦ 9,908 ￦ 39 ￦ 73

Investments in Associates and_2

Investments in Associates and Joint Ventures(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Significant Investments In Associates Abstract [Abstract]
Disclosure Of Interests In Associates Explanatory	Investments in associates and joint ventures as of December 31, 2019 and 2020, are as follows: December 31, 2019 Ownership Acquisition Share of net Carrying Industry Location (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 1 15.19 ￦ 1,137 ￦ 1,705 ￦ 1,705 Investment finance Korea KB GwS Private Securities Investment Trust 26.74 113,880 138,013 136,168 Investment finance Korea KB-KDBC Pre-IPO 2 66.66 20,000 18,988 18,988 Investment finance Korea KB Star Office Private Real Estate Investment Trust No.1 21.05 20,000 19,839 19,839 Investment finance Korea PT Bank Bukopin TBK 22.00 116,422 115,321 121,381 Banking and foreign exchange transaction Indonesia Balhae Infrastructure Company 1 12.61 105,214 101,391 101,391 Investment finance Korea Aju Good Technology Venture Fund 38.46 19,998 23,016 23,016 Investment finance Korea SY Auto Capital Co., Ltd. 49.00 9,800 17,736 12,725 Installment loan Korea Incheon Bridge Co., Ltd. 1 14.99 9,158 (14,746 ) — Operation of highways and related facilities Korea Big Dipper Co., Ltd. 29.33 440 10 125 Research, consulting and big data Korea Paycoms Co., Ltd. 3 11.70 800 17 45 System software publishing Korea Food Factory Co., Ltd. 4 22.22 1,000 398 1,000 Farm product distribution industry Korea KBSP Private Equity Fund No.4 1 14.95 6,100 5,904 5,904 Investment finance Korea KB Private Equity Fund No.3 1 15.69 8,000 7,754 7,754 Investment finance Korea Korea Credit Bureau Co., Ltd. 1 9.00 4,500 5,991 5,991 Credit information Korea KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 25.00 12,970 13,616 13,616 Investment finance Korea Keystone-Hyundai Securities No.1 Private Equity Fund 1 4.49 1,908 1,625 1,625 Investment finance Korea KB Social Impact Investment Fund 30.00 1,500 1,465 1,465 Investment finance Korea KB-Solidus 43.33 42,697 45,021 45,718 Investment finance Korea POSCO-KB 31.25 7,500 6,847 6,847 Investment finance Korea KB-TS 2 56.00 19,824 19,731 19,731 Investment finance Korea KB-Brain Scale-up 2 42.55 21,250 20,504 19,752 Investment finance Korea KB-SJ 1 18.52 3,000 2,761 2,761 Investment finance Korea UNION Media Commerce Fund 28.99 1,000 961 961 Investment Korea KB-Stonebridge 1 14.56 5,215 4,944 4,944 Investment finance Korea KB SPROTT Renewable Private Equity Fund No.1 37.69 1,667 1,295 1,295 Investment finance Korea KB-UTC 44.29 450 417 417 Investment finance Korea APRO Co., Ltd. 1 15.19 1,500 2,565 2,790 Manufacture of electric power storage system Korea GH Real Estate I LP 42.00 17,678 19,042 19,042 Asset management Guernsey Others 2,505 2,243 1,244 ￦ 577,113 ￦ 584,374 ￦ 598,240 December 31, 2020 Ownership Acquisition Share of net Carrying Industry Location (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 1 15.19 ￦ 551 ￦ 1,279 ￦ 1,279 Investment finance Korea KB GwS Private Securities Investment Trust 26.74 113,880 142,799 141,359 Investment finance Korea KB-KDBC Pre-IPO 2 66.66 13,601 16,042 16,042 Investment finance Korea KB Star Office Private Real Estate Investment Trust No.1 21.05 20,000 20,413 20,066 Investment finance Korea Balhae Infrastructure Company 1 12.61 106,107 106,624 106,624 Investment finance Korea Aju Good Technology Venture Fund 38.46 17,113 21,351 21,348 Investment finance Korea SY Auto Capital Co., Ltd. 49.00 9,800 18,713 16,144 Installment loan Korea Incheon Bridge Co., Ltd. 1 14.99 9,158 (18,100 ) — Operation of highways and related facilities Korea Big Dipper Co., Ltd. 25.14 440 (5 ) — Research, consulting and big data Korea Paycoms Co., Ltd. 3 11.70 800 72 198 System software publishing Korea Food Factory Co., Ltd. 4 22.22 1,000 632 1,281 Farm product distribution industry Korea KBSP Private Equity Fund No.4 1 14.95 6,100 5,950 5,950 Investment finance Korea KB Private Equity Fund No.3 1 15.69 — 94 94 Investment finance Korea Korea Credit Bureau Co., Ltd. 1 9.00 4,500 7,153 7,153 Credit information Korea KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 25.00 9,739 9,845 9,845 Investment finance Korea Keystone-Hyundai Securities No.1 Private Equity Fund 1 4.49 1,908 1,556 1,556 Investment finance Korea KB Social Impact Investment Fund 30.00 3,000 2,874 2,874 Investment finance Korea KB-Solidus 43.33 48,677 45,516 46,213 Investment finance Korea POSCO-KB 31.25 10,375 12,895 12,895 Investment finance Korea KB-TS 2 56.00 16,576 17,630 17,630 Investment finance Korea KB-Brain Scale-up 2 42.55 26,050 27,513 26,763 Investment finance Korea KB-SJ 1 18.52 4,500 4,133 4,133 Investment finance Korea UNION Media Commerce Fund 28.99 1,000 960 960 Investment Korea KB-Stonebridge 1 14.56 14,308 16,636 16,636 Investment finance Korea KB SPROTT Renewable Private Equity Fund No.1 37.69 5,795 5,049 5,049 Investment finance Korea KB-UTC 44.29 17,416 16,999 16,999 Investment finance Korea WJ Private Equity Fund No.1 26.95 10,000 9,711 9,711 Investment finance Korea All Together Korea Fund No.2 99.99 10,000 10,023 10,023 Asset management Korea KB-NAU 1 12.00 5,700 5,611 5,611 Asset management Korea JR GLOBAL REIT 26.07 215,854 215,854 215,854 Real estate management Korea Project Vanilla Co., Ltd. 49.00 2,450 2,151 2,151 System software publishing Korea December & Company Inc. 1 17.63 24,849 24,402 24,402 System software publishing Korea 2020 KB Fintech Renaissance Fund 1 5.05 550 547 547 Investment finance Korea KB Material and Parts No.1 PEF 1 14.47 3,400 3,371 3,371 Investment finance Korea FineKB Private Equity Fund No.1 25.00 — — — Investment finance Korea Others 2,475 1,004 674 ￦ 737,672 ￦ 757,297 ￦ 771,435 1 As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate’s financial and business policies through participation in governing bodies. 2 In order to direct relevant activities, it is necessary to obtain the consent of the two co-operative 3 The ownership of Paycoms Co., Ltd. would be 22.96% and 22.96% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond. 4 The ownership of Food Factory Co., Ltd. would be 30.00% and 30.00% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond. In accordance with IAS No.28 Investments in Associates and Joint Ventures Although the Group holds more than 20% of ownership, the entities that the Group has a limited influence on due to the trust agreement on related activities, bankruptcy and rehabilitation procedures have been excluded from the investment in associates by limited influence
Disclosure Of Reconciliation Of Summarised Financial Information Of Associate Accounted For Using Equity Method To Carrying Amount Of Interest In Associate Explanatory	Condensed financial information, adjustments to the carrying amount and dividend from major investments in associates and joint ventures as of December 31, 2019 and 2020, and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019* Total assets Total Paid-in Equity Share of net Unrealized Consoli- (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 11,237 ￦ 20 ￦ 8,690 ￦ 11,217 ￦ 1,705 ￦ — ￦ 1,705 KB GwS Private Securities Investment Trust 522,865 741 425,814 522,124 138,013 (1,845 ) 136,168 KB-KDBC Pre-IPO 29,086 603 30,000 28,483 18,988 — 18,988 KB Star Office Private Real Estate Investment Trust No.1 218,611 122,465 95,000 96,146 19,839 — 19,839 PT Bank Bukopin TBK 8,148,013 7,623,829 106,536 524,184 115,321 6,060 121,381 Balhae Infrastructure Company 806,218 1,854 834,695 804,364 101,391 — 101,391 Aju Good Technology Venture Fund 60,675 828 52,000 59,847 23,016 — 23,016 SY Auto Capital Co., Ltd. 88,611 52,415 20,000 36,196 17,736 (5,011 ) 12,725 Incheon Bridge Co., Ltd. 609,194 707,563 61,096 (98,369 ) (14,746 ) 14,746 — Big Dipper Co., Ltd. 370 336 1,500 34 10 115 125 APRO Co., Ltd. 47,164 30,281 2,468 16,883 2,565 225 2,790 Paycoms Co., Ltd. 1,763 1,620 855 143 17 28 45 Food Factory Co., Ltd. 5,587 3,797 450 1,790 398 602 1,000 KBSP Private Equity Fund No.4 39,492 2 40,800 39,490 5,904 — 5,904 KB Private Equity Fund No.3 49,437 4 51,000 49,433 7,754 — 7,754 Korea Credit Bureau Co., Ltd. 96,855 30,289 10,000 66,566 5,991 — 5,991 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 55,524 1,063 51,880 54,461 13,616 — 13,616 Keystone-Hyundai Securities No.1 Private Equity Fund 187,156 153,842 42,837 33,314 1,625 — 1,625 KB Social Impact Investment Fund 4,885 3 5,000 4,882 1,465 — 1,465 KB-Solidus 103,896 5 61,800 103,891 45,021 697 45,718 POSCO-KB 21,916 4 24,000 21,912 6,847 — 6,847 GH Real Estate I LP 45,340 61 42,093 45,279 19,042 — 19,042 KB-TS 36,445 1,212 35,400 35,233 19,731 — 19,731 KB-Brain Scale-up 48,369 185 51,700 48,184 20,504 (752 ) 19,752 KB-SJ 14,914 4 16,200 14,910 2,761 — 2,761 UNION Media Commerce Fund 3,318 4 3,450 3,314 961 — 961 KB-Stonebridge 34,450 507 35,805 33,943 4,944 — 4,944 KB SPROTT Renewable Private Equity Fund No.1 3,686 249 9,640 3,437 1,295 — 1,295 KB-UTC 1,016 75 1,016 941 417 — 417 2019* Operating Net profit Other Total Dividends (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 3,225 ￦ 2,452 ￦ — ￦ 2,452 ￦ — KB GwS Private Securities Investment Trust 42,503 41,524 — 41,524 9,297 KB-KDBC Pre-IPO 371 (638 ) — (638 ) — KB Star Office Private Real Estate Investment Trust No.1 14,455 6,004 — 6,004 — PT Bank Bukopin TBK 721,169 (5,612 ) 45,780 40,168 — Balhae Infrastructure Company 62,113 (3,153 ) — (3,153 ) 6,855 Aju Good Technology Venture Fund 9,288 7,734 — 7,734 — SY Auto Capital Co., Ltd. 20,394 5,292 (215 ) 5,077 — Incheon Bridge Co., Ltd. 107,178 9,127 — 9,127 — Big Dipper Co., Ltd. 598 (532 ) — (532 ) — APRO Co., Ltd. 47,725 7,702 — 7,702 — Paycoms Co., Ltd. 262 (343 ) — (343 ) — Food Factory Co., Ltd. 6,807 664 — 664 — KBSP Private Equity Fund No.4 39 (1,304 ) — (1,304 ) — KB Private Equity Fund No.3 — (485 ) — (485 ) — Korea Credit Bureau Co., Ltd. 91,200 1,480 — 1,480 135 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 4,077 (3,911 ) — (3,911 ) — Keystone-Hyundai Securities No.1 Private Equity Fund 18,342 (572 ) — (572 ) — KB Social Impact Investment Fund 8 (118 ) — (118 ) — KB-Solidus 13,085 8,708 — 8,708 — POSCO-KB 1,000 (371 ) — (371 ) — GH Real Estate I LP 5,043 3,698 565 4,263 — KB-TS 1,643 632 — 632 — KB-Brain Scale-up 138 (3,355 ) — (3,355 ) — KB-SJ — (673 ) — (673 ) — UNION Media Commerce Fund — (3 ) — (3 ) — KB-Stonebridge 346 (1,856 ) — (1,856 ) — KB SPROTT Renewable Private Equity Fund No.1 1 (986 ) — (986 ) — KB-UTC — (75 ) — (75 ) — December 31, 2020* Total assets Total Paid-in Equity Share Unrealized Consolidated (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 8,423 ￦ 3 ￦ 5,940 ￦ 8,420 ￦ ￦ — ￦ 1,279 KB GwS Private Securities Investment Trust 534,764 741 425,814 534,023 142,799 (1,440 ) 141,359 KB-KDBC Pre-IPO 24,655 592 20,400 24,063 16,042 — 16,042 KB Star Office Private Real Estate Investment Trust No.1 231,018 122,298 95,000 108,720 20,413 (347 ) 20,066 Balhae Infrastructure Company 847,758 1,870 841,784 845,888 106,624 — 106,624 Aju Good Technology Venture Fund 57,776 2,265 44,500 55,511 21,351 (3 ) 21,348 SY Auto Capital Co., Ltd. 89,462 51,272 20,000 38,190 18,713 (2,569 ) 16,144 Incheon Bridge Co., Ltd. 579,386 700,133 61,096 (120,747 ) (18,100 ) 18,100 — Big Dipper Co., Ltd. 285 306 1,750 (21 ) (5 ) 5 — Paycoms Co., Ltd. 2,690 2,073 855 617 72 126 198 Food Factory Co., Ltd. 7,613 4,767 450 2,846 632 649 1,281 KBSP Private Equity Fund No.4 39,795 — 40,800 39,795 5,950 — 5,950 KB Private Equity Fund No.3 1,132 533 — 599 94 — 94 Korea Credit Bureau Co., Ltd. 117,077 37,599 10,000 79,478 7,153 — 7,153 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 42,585 3,205 38,960 39,380 9,845 — 9,845 Keystone-Hyundai Securities No.1 Private Equity Fund 178,848 132,123 42,837 46,725 1,556 — 1,556 KB Social Impact Investment Fund 9,585 4 10,000 9,581 2,874 — 2,874 KB-Solidus 106,215 1,179 75,600 105,036 45,516 697 46,213 POSCO-KB 41,807 541 33,200 41,266 12,895 — 12,895 KB-TS 34,972 3,490 29,600 31,482 17,630 — 17,630 KB-Brain Scale-up 64,968 313 62,980 64,655 27,513 (750 ) 26,763 KB-SJ 22,327 6 24,300 22,321 4,133 — 4,133 UNION Media Commerce Fund 3,318 7 3,450 3,311 960 — 960 KB-Stonebridge 114,712 496 98,235 114,216 16,636 — 16,636 KB SPROTT Renewable Private Equity Fund No.1 13,896 497 15,376 13,399 5,049 — 5,049 KB-UTC 38,585 207 39,319 38,378 16,999 — 16,999 WJ Private Equity Fund No.1 36,197 170 37,100 36,027 9,711 — 9,711 All Together Korea Fund No.2 10,025 1 10,001 10,024 10,023 — 10,023 KB-NAU 47,607 850 47,500 46,757 5,611 — 5,611 JR GLOBAL REIT 1,859,214 1,043,068 165,600 816,146 215,854 — 215,854 Project Vanilla Co., Ltd. 4,445 132 5,000 4,313 2,151 — 2,151 December & Company Inc. 68,173 3,305 35,441 64,868 24,402 — 24,402 2020 KB Fintech Renaissance Fund 10,841 5 10,900 10,836 547 — 547 KB Material and Parts No.1 PEF 23,296 — 23,500 23,296 3,371 — 3,371 FineKB Private Equity Fund No.1 — 77 — (77 ) — — — 2020* Operating Net profit Other Total Dividends (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 1,942 ￦ 1,053 ￦ — ￦ 1,053 ￦ — KB GwS Private Securities Investment Trust 48,501 47,520 — 47,520 9,525 KB-KDBC Pre-IPO 5,151 4,421 — 4,421 — KB Star Office Private Real Estate Investment Trust No.1 2,392 1,076 — 1,076 — Balhae Infrastructure Company 63,781 89,757 — 89,757 6,973 Aju Good Technology Venture Fund 8,685 2,815 — 2,815 — SY Auto Capital Co., Ltd. 17,404 2,057 (49 ) 2,008 — Incheon Bridge Co., Ltd. 70,345 (23,200 ) — (23,200 ) — Big Dipper Co., Ltd. 942 (305 ) — (305 ) — Paycoms Co., Ltd. 1,391 505 — 505 — Food Factory Co., Ltd. 9,282 407 — 407 — KBSP Private Equity Fund No.4 2 306 — 306 — KB Private Equity Fund No.3 — 15,442 — 15,442 2,082 Korea Credit Bureau Co., Ltd. 107,810 13,391 — 13,391 89 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 1,629 626 — 626 — Keystone-Hyundai Securities No.1 Private Equity Fund 16,586 (1,536 ) — (1,536 ) — KB Social Impact Investment Fund 8 (301 ) — (301 ) — KB-Solidus 6,435 (12,655 ) — (12,655 ) — POSCO-KB 12,842 10,154 — 10,154 — KB-TS 5,342 4,051 — 4,051 — KB-Brain Scale-up 5,257 3,013 — 3,013 — KB-SJ — (689 ) — (689 ) — UNION Media Commerce Fund — (3 ) — (3 ) — KB-Stonebridge 20,068 17,842 — 17,842 — KB SPROTT Renewable Private Equity Fund No.1 1 (991 ) — (991 ) — KB-UTC — (866 ) — (866 ) — WJ Private Equity Fund No.1 2 (1,073 ) — (1,073 ) — All Together Korea Fund No.2 187 150 — 150 — KB-NAU 2,901 (743 ) — (743 ) — JR GLOBAL REIT — — — — — Project Vanilla Co., Ltd. — (611 ) — (611 ) — December & Company Inc. 756 (2,469 ) — (2,469 ) — 2020 KB Fintech Renaissance Fund 1 (64 ) — (64 ) — KB Material and Parts No.1 PEF — (204 ) — (204 ) — FineKB Private Equity Fund No.1 — (77 ) — (77 ) — * The condensed financial information of the associates and joint ventures is adjusted to reflect adjustments made by the Group, such as fair value adjustments made at the time of acquisition and adjustments for differences in accounting policies.
Schedule Of Changes Investments In Associates Text Block [Text Block]	Changes in carrying amount of investments in associates and joint ventures for the years ended December 31, 2019 and 2020, are as follows: 2019 1 Beginning Acquisition Disposal Dividends Gains Other hensive income Impairment Ending (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 1,649 ￦ — ￦ (317 ) ￦ — ￦ 373 ￦ — ￦ — ￦ 1,705 KB GwS Private Securities Investment Trust 134,362 — — (9,297 ) 11,103 — — 136,168 KB-KDBC Pre-IPO 14,594 5,000 — — (606 ) — — 18,988 KB Star Office Private Real Estate Investment Trust No.1 19,839 — — — — — — 19,839 PT Bank Bukopin 2 113,932 — — — (1,236 ) 10,408 (1,723 ) 121,381 Balhae Infrastructure Company 108,050 592 — (6,855 ) (396 ) — — 101,391 Aju Good Technology Venture Fund 18,134 1,960 — — 2,922 — — 23,016 SY Auto Capital Co., Ltd. 10,672 — — — 2,158 (105 ) — 12,725 Big Dipper Co., Ltd. 280 — — — (155 ) — — 125 APRO Co., Ltd. 1,403 — — — 1,386 1 — 2,790 Paycoms Co., Ltd. 103 — — — (58 ) — — 45 Food Factory Co., Ltd. 928 — — — 72 — — 1,000 KBSP Private Equity Fund No.4 — 6,100 — — (196 ) — — 5,904 KB Private Equity Fund No.3 7,830 — — — (76 ) — — 7,754 Korea Credit Bureau Co., Ltd. 5,941 — — (135 ) 185 — — 5,991 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 14,601 — — — (985 ) — — 13,616 Keystone-Hyundai Securities No.1 Private Equity Fund 1,581 66 — — (26 ) 4 — 1,625 KB Social Impact Investment Fund — 1,500 — — (35 ) — — 1,465 KB-Solidus — 42,697 — — 3,021 — — 45,718 POSCO-KB 4,463 2,500 — — (116 ) — — 6,847 GH Real Estate I LP 17,252 — — — 1,553 237 — 19,042 KB-TS 13,777 7,440 (1,840 ) — 269 85 — 19,731 KB-Brain Scale-up 7,930 13,250 — — (1,428 ) — — 19,752 KB-SJ 1,386 1,500 — — (125 ) — — 2,761 UNION Media Commerce Fund 962 — — — (1 ) — — 961 KB-Stonebridge — 7,070 (1,855 ) — (271 ) — — 4,944 KB SPROTT Renewable Private Equity Fund No.1 — 1,667 — — (372 ) — — 1,295 KB-UTC — 450 — — (33 ) — — 417 Others 5,263 408 (4,463 ) — 667 212 (843 ) 1,244 ￦ 504,932 ￦ 92,200 ￦ (8,475 ) ￦ (16,287 ) ￦ 17,594 ￦ 10,842 ￦ (2,566 ) ￦ 598,240 2020 1 Beginning Acquisition Disposal Dividends Gains Other hensive income Ending (In millions of Korean won) KB Pre IPO Secondary Venture Fund No.1 ￦ 1,705 ￦ — ￦ (586 ) ￦ — ￦ 160 ￦ — ￦ 1,279 KB GwS Private Securities Investment Trust 136,168 — — (9,525 ) 14,716 — 141,359 KB-KDBC Pre-IPO 18,988 — (6,399 ) — 3,453 — 16,042 KB Star Office Private Real Estate Investment Trust No.1 19,839 — — — 227 — 20,066 PT Bank Bukopin TBK 2 121,381 43,909 (54,069 ) — (107,258 ) (3,963 ) — Balhae Infrastructure Company 101,391 893 — (6,973 ) 11,313 — 106,624 Aju Good Technology Venture Fund 23,016 — (2,885 ) — 1,217 — 21,348 SY Auto Capital Co., Ltd. 12,725 — — — 3,422 (3 ) 16,144 Incheon Bridge Co., Ltd. — — — — — — — Big Dipper Co., Ltd. 125 — — — (125 ) — — Paycoms Co., Ltd. 45 — — — 153 — 198 Food Factory Co., Ltd. 1,000 — — — 247 34 1,281 KBSP Private Equity Fund No.4 5,904 — — — 46 — 5,950 KB Private Equity Fund No.3 7,754 — (8,000 ) (2,082 ) 2,422 — 94 Korea Credit Bureau Co., Ltd. 5,991 — — (89 ) 1,251 — 7,153 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 13,616 — (3,231 ) — (540 ) — 9,845 Keystone-Hyundai Securities No.1 Private Equity Fund 1,625 — — — (69 ) — 1,556 KB Social Impact Investment Fund 1,465 1,500 — — (91 ) — 2,874 KB-Solidus 45,718 10,920 (4,940 ) — (5,485 ) — 46,213 POSCO-KB 6,847 5,000 (2,125 ) — 3,173 — 12,895 KB-TS 19,731 2,240 (5,488 ) — 1,232 (85 ) 17,630 KB-Brain Scale-up 19,752 8,000 (3,200 ) — 2,211 — 26,763 KB-SJ 2,761 1,500 — — (128 ) — 4,133 UNION Media Commerce Fund 961 — — — (1 ) — 960 KB-Stonebridge 4,944 9,093 — — 2,599 — 16,636 KB SPROTT Renewable Private Equity Fund No.1 1,295 4,128 — — (374 ) — 5,049 KB-UTC 417 16,966 — — (384 ) — 16,999 WJ Private Equity Fund No.1 — 10,000 — — (289 ) — 9,711 All Together Korea Fund No.2 — 100,000 (90,000 ) — 150 (127 ) 10,023 KB-NAU — 5,700 — — (89 ) — 5,611 JR GLOBAL REIT — 219,493 (3,639 ) — — — 215,854 Project Vanilla Co., Ltd. — 2,450 — — (299 ) — 2,151 December & Company Inc. — 30,000 (5,151 ) — (447 ) — 24,402 2020 KB Fintech Renaissance Fund — 550 — — (3 ) — 547 KB Material and Parts No.1 PEF — 3,400 — — (29 ) — 3,371 FineKB Private Equity Fund No.1 — — — — — — — Others 23,076 40,000 (61,862 ) — (899 ) 359 674 ￦ 598,240 ￦ 515,742 ￦ (251,575 ) ￦ (18,669 ) ￦ (68,518 ) ￦ (3,785 ) ￦ 771,435 1 Gains on disposal of investments in associates and joint ventures amount to ￦ 1,423 million ￦ 24,768 million for the years ended December 31, 2019 and 2020, respectively. 2 The investment was reclassified to subsidiaries from associates for the year ended December 31, 2020 due to additional share purchase.
Schedule Of Accumulated Unrecognized Share Of Losses Investment In Associates Text Block [Text Block]	Unrecognized share of losses in investments in associates and joint ventures due to discontinuation of applying the equity method for the years ended December 31, 2019 and 2020 and accumulated amount as of December 31, 2019 and 2020, are as follows: Unrecognized losses (gains) Accumulated unrecognized losses 2019 2020 December 31, 2019 December 31, 2020 (In millions of Korean won) Doosung Metal Co., Ltd. ￦ 46 ￦ — ￦ 65 ￦ 65 Incheon Bridge Co., Ltd. (1,944 ) 3,354 14,746 18,100 Jungdong Steel Co., Ltd. — — 489 489 DPAPS Co., Ltd. 14 19 339 358 Shinla Construction Co., Ltd. — — 183 183 Jaeyang Industry Co., Ltd. — — 30 30 Terra Corporation — — 14 14 Jungdo Co., Ltd. — 151 161 312 Jinseung Tech Co., Ltd. 18 — 21 21 Korea NM Tech Co., Ltd. — — 28 28 Chongil Machine & Tools Co., Ltd. 19 — 19 19 SKYDIGITAL INC. 106 — 106 106 Imt Technology Co., Ltd. — 3 — 3 Jo Yang Industrial Co., Ltd. — 96 — 96 IDTECK Co., Ltd. — 216 — 216 ￦ (1,741 ) ￦ 3,839 ￦ 16,201 ￦ 20,040

Property and Equipment And Inve

Property and Equipment And Investment Properties(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Property Plant And Equipment And Investment Property Abstract [Abstract]
Disclosure Of Detailed Information About Property Plant And Equipment Explanatory	Details of property and equipment as of December 31, 2019 and 2020, are as follows: December 31, 2019 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Land ￦ 2,431,812 ￦ — ￦ (1,018 ) ￦ 2,430,794 Buildings 2,265,929 (757,147 ) (5,859 ) 1,502,923 Leasehold improvements 865,531 (749,407 ) — 116,124 Equipment and vehicles 1,867,739 (1,487,386 ) — 380,353 Construction in-progress 86,303 — — 86,303 Right-of-use 854,327 (302,269 ) (1,178 ) 550,880 ￦ 8,371,641 ￦ (3,296,209 ) ￦ (8,055 ) ￦ 5,067,377 December 31, 2020 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Land ￦ 2,611,604 ￦ — ￦ (1,018 ) ￦ 2,610,586 Buildings 2,607,957 (830,516 ) (5,859 ) 1,771,582 Leasehold improvements 929,120 (833,293 ) — 95,827 Equipment and vehicles 2,040,100 (1,699,442 ) — 340,658 Construction in-progress 44,190 — — 44,190 Right-of-use 1,094,876 (524,165 ) — 570,711 ￦ 9,327,847 ￦ (3,887,416 ) ￦ (6,877 ) ￦ 5,433,554 Changes in property and equipment for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Acquisition Transfer 1 Disposal Depreciation 2 Business Combination Others Ending (In millions of Korean won) Land ￦ 2,432,041 ￦ 7,334 ￦ (3,957 ) ￦ (4,907 ) ￦ — ￦ — ￦ 283 ￦ 2,430,794 Buildings 1,330,211 10,908 220,535 (9,964 ) (55,669 ) — 6,902 1,502,923 Leasehold improvements 122,309 13,398 58,645 (338 ) (77,948 ) — 58 116,124 Equipment and vehicles 280,624 283,896 (4 ) (526 ) (183,900 ) — 263 380,353 Construction in-progress 88,618 293,204 (288,136 ) — — — (7,383 ) 86,303 Right-of-use 589,188 379,934 19 (153,034 ) (281,404 ) — 16,177 550,880 ￦ 4,842,991 ￦ 988,674 ￦ (12,898 ) ￦ (168,769 ) ￦ (598,921 ) ￦ — ￦ 16,300 ￦ 5,067,377 2020 Beginning Acquisition Transfer 1 Disposal Depreciation2 Business Combination Others Ending (In millions of Korean won) Land ￦ 2,430,794 ￦ 6,475 ￦ (116,264 ) ￦ (2,578 ) ￦ — ￦ 295,421 ￦ (3,262 ) ￦ 2,610,586 Buildings 1,502,923 43,592 190,917 (4,442 ) (61,339 ) 100,984 (1,053 ) 1,771,582 Leasehold improvements 116,124 13,348 34,596 (574 ) (73,394 ) 5,087 640 95,827 Equipment and vehicles 380,353 161,515 3,705 (1,990 ) (221,697 ) 19,873 (1,101 ) 340,658 Construction in-progress 86,303 229,927 (291,336 ) — — 20,022 (726 ) 44,190 Right-of-use 550,880 426,405 53 (203,376 ) (272,686 ) 55,656 13,779 570,711 ￦ 5,067,377 ￦ 881,262 ￦ (178,329 ) ￦ (212,960 ) ￦ (629,116 ) ￦ 497,043 ￦ 8,277 ￦ 5,433,554 1 Includes transfers with investment properties and assets held for sale. 2 Includes depreciation expenses amounting to ￦ 111 million and ￦ 123 million recorded as other operating expenses for the years ended December 31, 2019 and 2020, respectively. Changes in accumulated impairment losses of property and equipment for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Impairment Reversal Disposal and Ending (In millions of Korean won) Accumulated impairment losses of property and equipment ￦ (6,877 ) ￦ — ￦ — ￦ — ￦ (6,877 ) Accumulated impairment losses of right-of-use — (1,178 ) — — (1,178 ) ￦ (6,877 ) ￦ (1,178 ) ￦ — ￦ — ￦ (8,055 ) 2020 Beginning Impairment Reversal Disposal and Ending (In millions of Korean won) Accumulated impairment losses of property and equipment ￦ (6,877 ) ￦ (12 ) ￦ — ￦ 12 ￦ (6,877 ) Accumulated impairment losses of right-of-use (1,178 ) — — 1,178 — ￦ (8,055 ) ￦ (12 ) ￦ — ￦ 1,190 ￦ (6,877 )
Disclosure Of Detailed Information About Investment Property Explanatory	Details of investment properties as of December 31, 2019 and 2020, are as follows: December 31, 2019 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Land ￦ 1,537,240 ￦ — ￦ — ￦ 1,537,240 Buildings 1,463,736 (172,988 ) — 1,290,748 ￦ 3,000,976 ￦ (172,988 ) ￦ — ￦ 2,827,988 December 31, 2020 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Land ￦ 1,568,508 ￦ — ￦ (410 ) ￦ 1,568,098 Buildings 1,092,737 (122,833 ) (4,463 ) 965,441 ￦ 2,661,245 ￦ (122,833 ) ￦ (4,873 ) ￦ 2,533,539 Changes in investment properties for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Acquisition Transfer Disposal Depreciation Others Ending (In millions of Korean won) Land ￦ 972,562 ￦ 580,255 ￦ (3,374 ) ￦ (13,318 ) ￦ — ￦ 1,115 ￦ 1,537,240 Buildings 1,147,249 225,833 (8,861 ) (50,780 ) (36,877 ) 14,184 1,290,748 ￦ 2,119,811 ￦ 806,088 ￦ (12,235 ) ￦ (64,098 ) ￦ (36,877 ) ￦ 15,299 ￦ 2,827,988 2020 Beginning Acquisition Transfer Disposal Depreciation Business combination Others Ending (In millions of Korean won) Land ￦ 1,537,240 ￦ 34,529 ￦ 61,383 ￦ (167,015 ) ￦ — ￦ 106,944 ￦ (4,983 ) ￦ 1,568,098 Buildings 1,290,748 18,667 37,694 (378,332 ) (38,717 ) 42,169 (6,788 ) 965,441 ￦ 2,827,988 ￦ 53,196 ￦ 99,077 ￦ (545,347 ) ￦ (38,717 ) ￦ 149,113 ￦ (11,771 ) ￦ 2,533,539
Schedule Of Fair Value Of Investment Property Text Block [Text Block]	Valuation techniques and inputs that are used to measure the fair value of investment properties as of December 31, 2020, are as follows: December 31, 2020 Fair value Valuation techniques Inputs (In millions of Land and buildings ￦ 92,128 Cost approach method -  Price per square meter -  Replacement cost 1,141,121 Market comparison method -  Price per square meter 1,248,604 Cash flow approach -  Prospective rental market growth rate -  Period of vacancy -  Rental rate -  Discount rate and others 230,800 Income approach -  Discount rate -  Capitalization rate -  Vacancy rate Fair value of the investment properties amounts to ￦ 3,032,726 million and ￦ 2,712,653 million as of December 31, 2019 and 2020, respectively. The investment properties were measured by qualified independent appraisers with experience in valuing similar properties in the same area. In addition, per fair value hierarchy in Note 6.1.2, fair value hierarchy of all investment properties has been classified as Level 3. Rental income from the above investment properties for the years ended December 31, 2019 and 2020, amounts to ￦ 129,944 million and ￦ 157,652 million, respectively.

Intangible Assets(Table)

Intangible Assets(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Intangible Assets Abstract [Abstract]
Disclosure Of Intangible Assets And Goodwill Explanatory	Details of intangible assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 Acquisition Accumulated Accumulated Others Carrying amount (In millions of Korean won) Goodwill ￦ 346,314 ￦ — ￦ (70,517 ) ￦ (56 ) ￦ 275,741 Other intangible assets 4,420,371 (1,926,647 ) (31,652 ) — 2,462,072 ￦ 4,766,685 ￦ (1,926,647 ) ￦ (102,169 ) ￦ (56 ) ￦ 2,737,813 December 31, 2020 Acquisition Accumulated Accumulated Others Carrying amount (In millions of Korean won) Goodwill ￦ 887,259 ￦ — ￦ (70,517 ) ￦ (53,160 ) ￦ 763,582 Other intangible assets 4,928,003 (2,304,188 ) (36,264 ) — 2,587,551 ￦ 5,815,262 ￦ (2,304,188 ) ￦ (106,781 ) ￦ (53,160 ) ￦ 3,351,133 Details of intangible assets other than goodwill as of December 31, 2019 and 2020, are as follows: December 31, 2019 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Industrial property rights ￦ 5,802 ￦ (2,930 ) ￦ (19 ) ￦ 2,853 Software 1,428,655 (1,055,136 ) — 373,519 Other intangible assets 555,424 (257,274 ) (31,633 ) 266,517 Value of Business Acquired (VOBA) 2,395,290 (585,805 ) — 1,809,485 Right-of-use 35,200 (25,502 ) — 9,698 ￦ 4,420,371 ￦ (1,926,647 ) ￦ (31,652 ) ￦ 2,462,072 December 31, 2020 Acquisition Accumulated Accumulated Carrying (In millions of Korean won) Industrial property rights ￦ 6,222 ￦ (2,936 ) ￦ (940 ) ￦ 2,346 Software 1,800,686 (1,225,173 ) (2,326 ) 573,187 Other intangible assets 690,665 (285,893 ) (32,998 ) 371,774 Value of Business Acquired (VOBA) 2,395,291 (759,672 ) — 1,635,619 Right-of-use 35,139 (30,514 ) — 4,625 ￦ 4,928,003 ￦ (2,304,188 ) ￦ (36,264 ) ￦ 2,587,551 Changes in intangible assets other than goodwill for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Acquisition & Disposal Amortization 1 Others Ending (In millions of Korean won) Industrial property rights ￦ 4,497 ￦ 174 ￦ (1,160 ) ￦ (658 ) ￦ — ￦ 2,853 Software 204,505 274,583 — (105,228 ) (341 ) 373,519 Other intangible assets 2 248,611 59,776 (13,534 ) (33,590 ) 5,254 266,517 Value of Business Acquired (VOBA) 2,001,945 — — (192,460 ) — 1,809,485 Right-of-use 21,063 1,010 — (9,893 ) (2,482 ) 9,698 ￦ 2,480,621 ￦ 335,543 ￦ (14,694 ) ￦ (341,829 ) ￦ 2,431 ￦ 2,462,072 2020 Beginning Acquisition & Disposal Amortization 1 Business combination Others Ending (In millions of Korean won) Industrial property rights ￦ 2,853 ￦ 116 ￦ (147 ) ￦ (476 ) ￦ — ￦ — ￦ 2,346 Software 373,519 340,045 (4,444 ) (153,876 ) 18,252 (309 ) 573,187 Other intangible assets 2 266,517 63,743 (9,527 ) (47,948 ) 106,445 (7,456 ) 371,774 Value of Business Acquired (VOBA) 1,809,485 — — (173,866 ) — — 1,635,619 Right-of-use 9,698 — — (5,026 ) — (47 ) 4,625 ￦ 2,462,072 ￦ 403,904 ￦ (14,118 ) ￦ (381,192 ) ￦ 124,697 ￦ (7,812 ) ￦ 2,587,551 1 Includes ￦ 193,085 million and ￦ 173,992 million recorded as insurance expenses and other operating expenses for the years ended December 31, 2019 and 2020, respectively. 2 Impairment losses for membership right of other intangible asset with indefinite useful life was recognized when its recoverable amount is lower than its carrying amount, and reversal of impairment losses was recognized when its recoverable amount is higher than its carrying amount. Changes in accumulated impairment losses of goodwill for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Impairment Others Ending (In millions of Korean won) Accumulated impairment losses of goodwill ￦ (70,517 ) ￦ — ￦ — ￦ (70,517 ) 2020 Beginning Impairment Others Ending (In millions of Korean won) Accumulated impairment losses of goodwill ￦ (70,517 ) ￦ — ￦ — ￦ (70,517 ) Changes in accumulated impairment losses of other intangible assets for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Impairment Reversal Disposal and Ending (In millions of Korean won) Accumulated impairment losses of other intangible assets ￦ (45,017 ) ￦ (1,578 ) ￦ 6,859 ￦ 8,084 ￦ (31,652 ) 2020 Beginning Impairment Reversal Disposal and Ending (In millions of Korean won) Accumulated impairment losses of other intangible assets ￦ (31,652 ) ￦ (9,312 ) ￦ 3,669 ￦ 1,031 ￦ (36,264 )
Disclosure Of Goodwill Explanatory	Details of goodwill as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 Acquisition Carrying Acquisition Carrying (In millions of Korean won) Housing & Commercial Bank ￦ 65,288 ￦ 65,288 ￦ 65,288 ￦ 65,288 KB Cambodia Bank 1,202 — 1,202 — KB Securities Co., Ltd. 70,265 58,889 70,265 58,889 KB Capital Co., Ltd. 79,609 79,609 79,609 79,609 KB Savings Bank Co., Ltd. 115,343 57,404 115,343 57,404 KB Securities Vietnam Joint Stock Company 13,092 12,987 13,092 12,234 KB Daehan Specialized Bank Plc. 1,515 1,564 1,515 1,470 PRASAC Microfinance Institution Plc. — — 396,942 356,570 PT Sunindo Kookmin Best Finance — — 2,963 2,963 PT Bank Bukopin TBK — — 89,220 80,002 PT. KB Finansia Multi Finance — — 51,820 49,153 ￦ 346,314 ￦ 275,741 ￦ 887,259 ￦ 763,582 * Includes the effect of exchange differences etc.
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit Explanatory	Details of goodwill allocation to cash-generating units and related information for impairment testing as of December 31, 2020 are as follows: December 31, 2020 Carrying Recoverable amount Discount rate Permanent (In millions of Korean won) Housing & Commercial Bank Retail banking ￦ 49,315 ￦ 1,595,304 17.46 1.00 Corporate banking 15,973 955,540 17.63 1.00 KB Securities Co., Ltd. 58,889 11,340 21.46 1.00 KB Capital Co., Ltd. 79,609 424,933 17.39 1.00 KB Savings Bank Co., Ltd. and Yehansoul Savings Bank Co., Ltd. 57,404 443,778 13.80 1.00 KB Securities Vietnam Joint Stock Company 12,234 10,262 23.61 1.00 KB Daehan Specialized Bank Plc. 1,470 9,299 25.77 1.00 PRASAC Microfinance Institution Plc. 356,570 111,425 24.50 3.00 PT Sunindo Kookmin Best Finance 2,963 1,909 15.47 0.00 PT. KB Finansia Multi Finance 49,153 28,990 16.19 3.00 ￦ 683,580 ￦ 3,592,780 For impairment testing, goodwill is allocated to cash-generating units that are expected to benefit from the synergies of the business combination, and cash-generating units consist of an operating segment or units which are not larger than an operating segment. The Group recognized goodwill amounting to ￦ 65,288 million from the merger of Housing & Commercial Bank, the amounts of ￦ 49,315 million and ￦ 15,973 million were allocated to the retail banking and corporate banking, respectively. And the goodwill of ￦ 356,570 million arising from the acquisition of PRASAC Microfinance Institution Plc. was allocated to microfinance unit. Cash-generating units to which goodwill has been allocated is tested for impairment annually and whenever there is an indication that the unit may be impaired, by comparing the carrying amount of the unit, including the goodwill, with the recoverable amount of the unit. The recoverable amount of a cash-generating unit is measured at the higher of its fair value less costs to sell and its value in use. The fair value less costs to sell is the amount obtainable from the sale in an arm’s length transaction between knowledgeable, willing parties, less the costs of disposal. If it is difficult to measure the amount obtainable from the sale of the cash-generating unit, the Group measures the fair value less costs to sell by reflecting the characteristics of the measured cash-generating unit. If it is not possible to obtain reliable information to measure the fair value less costs to sell, the Group uses the asset’s value in use as its recoverable amount. Value in use is the present value of the future cash flows expected to be derived from an asset or cash-generating unit. The projections of the future cash flows are based on the most recent financial budget approved by management and generally cover a period of five years. The future cash flows of retail banking and corporate banking after projection period are estimated on the assumption that the future cash flows will increase by 1.0% per year. The key assumptions used for the estimation of the future cash flows are estimated based on the market size and the Group’s market share. The future cash flows PRASAC Microfinance Institution Plc. after five years are estimated on the assumption that the future cash flows will increase by 3.0% per year. The key assumptions used for the estimation of the future cash flows are the GDP growth rate of Cambodia, the market size and the recent growth rate of PRASAC Microfinance Institution Plc. The discount rate is a pre-tax The Group acquired a 67% stake in PT Bank Bukopin TBK with the acquisition date of September 2, 2020, and the goodwill recognized due to the business combination is ￦ 80,002 million as of December 31, 2020. The Group conducts an impairment test annually and whenever there is an indication of impairment, and no indication of impairment has been observed as of December 31, 2020.

Lease(Table)

Lease(Table)	12 Months Ended
	Dec. 31, 2020
Presentation of leases for lessee [Abstract]
The Amounts Recognized In The Consolidated Statement Of Financial Position	Amounts recognized in the consolidated statements of financial position related to lease as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Right-of-use Real estate ￦ 518,795 ￦ 537,392 Vehicles 13,542 16,218 Others 18,543 17,101 550,880 570,711 Right-of-use 9,698 4,626 ￦ 560,578 ￦ 575,337 Lease liabilities* ￦ 544,439 ￦ 559,113 * Included in property and equipment, intangible assets and other liabilities. Amounts recognized in the consolidated statements of comprehensive income related to lease for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 (In millions of Korean won) Depreciation and amortization of right-of-use Real estate ￦ 251,465 ￦ 246,058 Vehicles 19,594 15,286 Others 10,345 11,342 Intangible assets 9,893 5,026 ￦ 291,297 ￦ 277,712 Interest expenses on the lease liabilities ￦ 12,720 ￦ 13,492 Expense relating to short-term lease 2,209 6,169 Expense relating to leases of low-value 5,416 7,130 Expense relating to variable lease payments not included in lease liabilities (included in administrative expenses) 15 438 Total cash outflow for lease for the years ended December 31, 2019 and 2020 was ￦ 228,312 million and ￦ 245,151 million, respectively.
Details Of The Finance Lease As A Finance Lessor	The Group as a finance lessor Total lease investment and the present value of minimum lease payments as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 Total lease investment Present value Total lease investment Present (In millions of Korean won) Up to 1 year ￦ 654,104 ￦ 367,937 ￦ 579,968 ￦ 354,588 1-5 1,085,208 569,939 958,125 551,777 Over 5 years 773 748 — — ￦ 1,740,085 ￦ 938,624 ￦ 1,538,093 ￦ 906,365 Unearned interest income on finance lease as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Total lease investment ￦ 1,740,085 ￦ 1,538,093 Net lease investment Present value of minimum lease payments 938,624 906,365 Present value of non-guaranteed 639,075 496,969 1,577,699 1,403,334 Unearned interest income ￦ 162,386 ￦ 134,759 The Group as an operating lessor Future minimum lease receipts arising from the non-cancellable December 31, 2019 December 31, 2020 (In millions of Korean won) Minimum lease receipts Up to 1 year ￦ 577,490 ￦ 792,935 1-5 1,432,354 1,727,498 Over 5 years 682,165 84,733 ￦ 2,692,009 ￦ 2,605,166
Lease Payment Reflected In Profit Or Loss As An Operating Lessee	The lease payment reflected in profit or loss for the year ended December 31, 2018, is as follows: 2018 (In millions Minimum lease payment ￦ 221,305 Sublease payment (1,804 ) Total ￦ 219,501

Deferred Income Tax Assets An_2

Deferred Income Tax Assets And Liabilities(Table)	12 Months Ended
	Dec. 31, 2020
Deferred Tax Assets And Liabilities Abstract [Abstract]
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits Explanatory	Details of deferred income tax assets and liabilities as of December 31, 2019 and 2020, are as follows: December 31, 2019 Assets Liabilities Net amount (In millions of Korean won) Other provisions ￦ 115,500 ￦ — ￦ 115,500 Allowances for credit losses 451 (3,266 ) (2,815 ) Impairment losses of property and equipment 4,396 (1,952 ) 2,444 Share-based payments 18,002 — 18,002 Provisions for acceptances and guarantees 20,959 — 20,959 Gains or losses on valuation of derivatives 51,160 (158,604 ) (107,444 ) Present value discount 8,244 (4,201 ) 4,043 Gains or losses on fair value hedge 12,123 — 12,123 Accrued interest — (110,359 ) (110,359 ) Deferred loan origination fees and costs 531 (199,000 ) (198,469 ) Advanced depreciation provision — (1,703 ) (1,703 ) Gains or losses on revaluation 549 (329,331 ) (328,782 ) Investments in subsidiaries and others 35,306 (105,470 ) (70,164 ) Gains or losses on valuation of security investment 39,949 (265,934 ) (225,985 ) Defined benefit liabilities 557,423 — 557,423 Accrued expenses 249,999 — 249,999 Retirement insurance expense — (489,602 ) (489,602 ) Adjustments to the prepaid contributions — (22,897 ) (22,897 ) Derivative-linked securities 131,259 (34,635 ) 96,624 Others 469,540 (762,633 ) (293,093 ) 1,715,391 (2,489,587 ) (774,196 ) Offsetting of deferred income tax assets and liabilities (1,711,794 ) 1,711,794 — ￦ 3,597 ￦ (777,793 ) ￦ (774,196 ) December 31, 2020 Assets Liabilities Net amount (In millions of Korean won) Other provisions ￦ 149,259 ￦ — ￦ 149,259 Allowances for credit losses 26,496 (3,356 ) 23,140 Impairment losses of property and equipment 3,992 (1,889 ) 2,103 Share-based payments 17,718 — 17,718 Provisions for acceptances and guarantees 17,046 — 17,046 Gains or losses on valuation of derivatives 20,645 (223,482 ) (202,837 ) Present value discount 17,058 (3,041 ) 14,017 Gains or losses on fair value hedge 21,060 — 21,060 Accrued interest — (125,835 ) (125,835 ) Deferred loan origination fees and costs 7,224 (226,821 ) (219,597 ) Advanced depreciation provision — (1,703 ) (1,703 ) Gains or losses on revaluation 338 (319,698 ) (319,360 ) Investments in subsidiaries and others 38,164 (111,589 ) (73,425 ) Gains or losses on valuation of security investment 73,857 (1,232,689 ) (1,158,832 ) Defined benefit liabilities 606,146 — 606,146 Accrued expenses 334,900 — 334,900 Retirement insurance expense — (541,317 ) (541,317 ) Adjustments to the prepaid contributions — (28,261 ) (28,261 ) Derivative-linked securities 78,202 (30,881 ) 47,321 Others* 1,081,691 (740,462 ) 341,229 2,493,796 (3,591,024 ) (1,097,228 ) Offsetting of deferred income tax assets and liabilities (2,428,738 ) 2,428,738 — ￦ 65,058 ￦ (1,162,286 ) ￦ (1,097,228 ) * Includes PPA amount from acquisition of Prudential Life Insurance Company of Korea Ltd. and KB Insurance Co., Ltd., and others. Unrecognized Deferred Income Tax Assets No deferred income tax assets have been recognized for the deductible temporary difference of ￦ 242,875 million associated with investments in subsidiaries and associates as of December 31, 2020, because it is not probable that the temporary differences will be reversed in the foreseeable future. No deferred income tax assets have been recognized for deductible temporary differences of ￦ 75,831 million associated with others, as of December 31, 2020, due to the uncertainty that these will be realized in the future. Unrecognized Deferred Income Tax Liabilities No deferred income tax liabilities have been recognized for the taxable temporary difference of ￦ 260,739 million associated with investment in subsidiaries and associates as of December 31, 2020, due to the following reasons: • The Group is able to control the timing of the reversal of the temporary difference. • It is probable that the temporary difference will not be reversed in the foreseeable future. No deferred income tax liabilities have been recognized as of December 31, 2020, for the taxable temporary difference of ￦ 65,288 million arising from the initial recognition of goodwill from the merger of Housing and Commercial Bank in 2001. Changes in cumulative temporary differences for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Decrease Increase Ending (In millions of Korean won) Deductible temporary differences Gains or losses on fair value hedge ￦ — ￦ — ￦ 44,085 ￦ 44,085 Other provisions 411,903 411,747 424,227 424,383 Allowances for credit losses 12,481 16,160 5,697 2,018 Impairment losses on property and equipment 21,927 21,402 15,460 15,985 Deferred loan origination fees and costs 1,841 1,841 1,930 1,930 Share-based payments 60,071 52,475 55,496 63,092 Provisions for acceptance and guarantees 73,809 73,809 76,214 76,214 Gains or losses on valuation of derivatives 503,277 503,277 186,035 186,035 Present value discount 24,593 24,347 29,732 29,978 Investments in subsidiaries and others 184,870 47,217 47,727 185,380 Gains or losses on valuation of security investment 269,731 264,318 130,823 136,236 Defined benefit liabilities 1,977,430 200,827 384,616 2,161,219 Accrued expenses 993,906 994,326 912,019 911,599 Derivative-linked securities 13,679 13,679 477,307 477,307 Others 1,290,065 600,750 979,710 1,669,025 5,839,583 3,226,175 3,771,078 6,384,486 Unrecognized deferred income tax assets: Other provisions 3,416 4,788 Investments in subsidiaries and others 73,764 67,645 Others 120,704 125,158 5,641,699 6,186,895 Tax rate (%) 27.5 27.5 Total deferred income tax assets ￦ 1,562,537 ￦ 1,715,391 Taxable temporary differences Gains or losses on fair value hedge ￦ (94,085 ) ￦ (94,085 ) ￦ — ￦ — Accrued interest (411,487 ) (362,627 ) (352,477 ) (401,337 ) Allowances for credit losses (238 ) (238 ) (11,877 ) (11,877 ) Impairment losses on property and equipment (4,457 ) (212 ) 82 (4,163 ) Deferred loan origination fees and costs (727,528 ) (727,528 ) (752,178 ) (752,178 ) Advanced depreciation provision (6,192 ) — — (6,192 ) Gains or losses on valuation of derivatives (49,036 ) (49,036 ) (576,743 ) (576,743 ) Present value discount (8,656 ) (8,656 ) (15,278 ) (15,278 ) Goodwill from merger (65,288 ) — — (65,288 ) Gains or losses on revaluation (1,201,992 ) (52,470 ) (48,044 ) (1,197,566 ) Investments in subsidiaries and others (316,346 ) (19,421 ) (122,130 ) (419,055 ) Gains or losses on valuation of security investment (601,496 ) (594,206 ) (899,500 ) (906,790 ) Retirement insurance expense (1,611,475 ) (153,528 ) (317,793 ) (1,775,740 ) Adjustments to the prepaid contributions (69,212 ) (69,212 ) (83,262 ) (83,262 ) Derivative-linked securities (271,873 ) (271,873 ) (125,947 ) (125,947 ) Others (2,098,159 ) (2,917,318 ) (3,613,007 ) (2,793,848 ) (7,537,520 ) (5,320,410 ) (6,918,154 ) (9,135,264 ) Unrecognized deferred income tax liabilities: — Goodwill from merger (65,288 ) (65,288 ) Investments in subsidiaries and others (62,367 ) (68,836 ) Others (588 ) (1,247 ) (7,409,277 ) (8,999,893 ) Tax rate (%) 27.5 27.5 Total deferred income tax liabilities ￦ (2,050,913 ) ￦ (2,489,587 ) 2020 Beginning Business combination Decrease Increase Ending (In millions of Korean won) Deductible temporary differences Gains or losses on fair value hedge ￦ 44,085 ￦ — ￦ 44,085 ￦ 76,583 ￦ 76,583 Other provisions 424,383 6,383 426,457 540,396 544,705 Allowances for credit losses 2,018 105,505 96,885 83,111 93,749 Impairment losses of property and equipment 15,985 — 9,658 8,189 14,516 Deferred loan origination fees and costs 1,930 35,863 15,098 3,574 26,269 Share-based payments 63,092 5 55,601 54,589 62,085 Provisions for acceptance and guarantees 76,214 — 76,214 61,984 61,984 Gains or losses on valuation of derivatives 186,035 5,201 191,236 76,238 76,238 Present value discount 29,978 — 29,732 61,783 62,029 Investments in subsidiaries and others 185,380 — 47,034 232,655 371,001 Gains or losses on valuation of security investment 136,236 — 136,070 251,524 251,690 Defined benefit liabilities 2,161,219 94,105 227,010 327,255 2,355,569 Accrued expenses 911,599 75,498 911,599 1,144,785 1,220,283 Derivative-linked securities 477,307 — 477,307 284,370 284,370 Others* 1,669,025 2,068,207 1,170,462 1,081,994 3,648,764 6,384,486 2,390,767 3,914,448 4,289,030 9,149,835 Unrecognized deferred income tax assets: Other provisions 4,788 3,054 Investments in subsidiaries and others 67,645 242,875 Others 125,158 75,831 6,186,895 8,828,075 Tax rate (%) 27.5 27.5 Total deferred income tax assets ￦ 1,715,391 ￦ 2,493,796 Taxable temporary differences Accrued interest ￦ (401,337 ) ￦ (168,859 ) ￦ (394,255 ) ￦ (281,685 ) ￦ (457,626 ) Allowances for credit losses (11,877 ) — (11,877 ) (12,203 ) (12,203 ) Impairment losses of property and equipment (4,163 ) — (111 ) 117 (3,935 ) Deferred loan origination fees and costs (752,178 ) — (752,178 ) (820,223 ) (820,223 ) Advanced depreciation provision (6,192 ) — — — (6,192 ) Gains or losses on valuation of derivatives (576,743 ) — (576,743 ) (812,662 ) (812,662 ) Present value discount (15,278 ) — (15,278 ) (10,916 ) (10,916 ) Goodwill from merger (65,288 ) — — — (65,288 ) Gains or losses on revaluation (1,197,566 ) — (80,036 ) (45,008 ) (1,162,538 ) Investments in subsidiaries and others (419,055 ) — (70,188 ) (297,809 ) (646,676 ) Gains or losses on valuation of security investment (906,790 ) (3,060,750 ) (899,660 ) (1,358,042 ) (4,425,922 ) Retirement insurance expense (1,775,740 ) (61,789 ) (162,764 ) (288,296 ) (1,963,061 ) Adjustments to the prepaid contributions (83,262 ) — (83,262 ) (102,768 ) (102,768 ) Derivative-linked securities (125,947 ) — (125,947 ) (112,293 ) (112,293 ) Others* (2,793,848 ) (1,613 ) (1,644,815 ) (1,555,740 ) (2,706,386 ) (9,135,264 ) (3,293,011 ) (4,817,114 ) (5,697,528 ) (13,308,689 ) Unrecognized deferred income tax liabilities: — Goodwill from merger (65,288 ) (65,288 ) Investments in subsidiaries and others (68,836 ) (260,739 ) Others (1,247 ) (1,042 ) (8,999,893 ) (12,981,620 ) Tax rate (%) 27.5 27.5 Total deferred income tax liabilities ￦ (2,489,587 ) ￦ (3,591,024 ) * Includes PPA amount from acquisition of Prudential Life Insurance Company of Korea Ltd. and KB Insurance Co., Ltd., and others.

Assets Held For Sale(Table)

Assets Held For Sale(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Assets Held For Sale Abstract [Abstract]
Schedule Of Assets Held For Sale	Details of assets held for sale as of December 31, 2019 and 2020, are as follows: December 31, 2019 Acquisition Accumulated Carrying Fair value less (In millions of Korean won) Land held for sale ￦ 14,542 ￦ (1,530 ) ￦ 13,012 ￦ 14,374 Buildings held for sale 11,391 (1,252 ) 10,139 12,396 ￦ 25,933 ￦ (2,782 ) ￦ 23,151 ￦ 26,770 December 31, 2020 Acquisition Accumulated Carrying Fair value less (In millions of Korean won) Land held for sale ￦ 80,740 ￦ (16,169 ) ￦ 64,571 ￦ 68,321 Buildings held for sale 152,426 (24,887 ) 127,539 134,247 Other assets held for sale 10,676 (5,059 ) 5,617 5,801 ￦ 243,842 ￦ (46,115 ) ￦ 197,727 ￦ 208,369 * Acquisition cost of buildings held for sale is net of accumulated depreciation before classified as assets held for sale. Changes in accumulated impairment losses of assets held for sale for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Provision Reversal Others Ending (In millions of Korean won) Accumulated impairment losses of assets held for sale ￦ (8,150 ) ￦ (333 ) ￦ — ￦ 5,701 ￦ (2,782 ) 2020 Beginning Provision Reversal Business Others Ending (In millions of Korean won) Accumulated impairment losses of assets held for sale ￦ (2,782 ) ￦ (11,593 ) ￦ — ￦ (45,433 ) ￦ 13,693 ￦ (46,115 ) As of December 31, 2020, assets held for sale consist of 4 real estates of closed offices and 1,087 foreclosure assets on loans of PT Bank Bukopin TBK, which were determined to sell by the management, but not yet sold as of December 31, 2020. Negotiation with buyers is in process for the one closed office and the remaining 1,090 assets are also being actively marketed.
Fair Value Measurement Inputs Of Assets Held Forsale Whose Fair Values Are Measured Table Text Block [Text Block]	Valuation techniques and inputs that are used to measure the fair value of assets held for sale as of December 31, 2020 are as follows: December 31, 2020 Fair value Valuation 1 Unobservable 2 Estimated range of Effect of (In millions of Korean won) Land and buildings ￦ 208,369 Market comparison Adjustment index 0.68 ~ 1.95 Fair value increases 1 The appraisal value is adjusted by the adjustment ratio in the event the public sale is unsuccessful. 2 Adjustment index is calculated using the time factor correction or local factors or individual factors. Among assets held for sale, real estate was measured by independent appraisers with recent experience in evaluating similar properties in the area of the property to be assessed with professional qualifications. All of assets held for sale are classified as level 3 in accordance with fair value hierarchy in Note 6.1.2.

Other Assets(Table)

Other Assets(Table)	12 Months Ended
	Dec. 31, 2020
Miscellaneous Assets Abstract [Abstract]
Disclosure Of Prepayments And Other Assets Explanatory	Details of other assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Other financial assets Other receivables ￦ 5,792,814 ￦ 10,628,272 Accrued income 1,659,182 1,726,651 Guarantee deposits 1,146,000 1,099,618 Domestic exchange settlement debits 531,356 722,616 Others 129,039 117,330 Allowances for credit losses (104,629 ) (119,762 ) Present value discount (6,703 ) (7,036 ) 9,147,059 14,167,689 Other non-financial Other receivables 1,294 1,091 Prepaid expenses 198,893 254,152 Guarantee deposits 4,084 3,906 Insurance assets 1,662,016 2,376,679 Separate account assets 5,052,804 10,210,047 Others 2,173,693 3,158,993 Allowances for credit losses (24,235 ) (17,520 ) 9,068,549 15,987,348 ￦ 18,215,608 ￦ 30,155,037 Changes in allowances for credit losses of other assets for the years ended December 31, 2019 and 2020, are as follows: 2019 Other financial Other non-financial Total (In millions of Korean won) Beginning ￦ 106,275 ￦ 24,780 ￦ 131,055 Write-offs (5,883 ) (152 ) (6,035 ) Provision (reversal) 9,885 (393 ) 9,492 Others (5,648 ) — (5,648 ) Ending ￦ 104,629 ￦ 24,235 ￦ 128,864 2020 Other financial Other non-financial Total (In millions of Korean won) Beginning ￦ 104,629 ￦ 24,235 ￦ 128,864 Write-offs (6,517 ) (8,503 ) (15,020 ) Provision 22,153 1,726 23,879 Business combination 7,946 59 8,005 Others (8,449 ) 3 (8,446 ) Ending ￦ 119,762 ￦ 17,520 ￦ 137,282

Financial Liabilities At Fair_2

Financial Liabilities At Fair Value Through Profit Or Loss(Table)	12 Months Ended
	Dec. 31, 2020
Current Financial Liabilities At Fair Value Through Profit Or Loss Abstract [Abstract]
Schedule Of Financial Liabilities At Fair Value Through Profit Or Loss Table Text Block [Text Block]	Details of financial liabilities at fair value through profit or loss, and financial liabilities designated at fair value through profit or loss as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Financial liabilities at fair value through profit or loss Borrowed securities sold ￦ 2,583,092 ￦ 1,934,735 Other 80,235 91,216 2,663,327 2,025,951 Financial liabilities designated at fair value through profit or loss Derivative-linked securities 12,704,826 9,784,107 12,704,826 9,784,107 ￦ 15,368,153 ￦ 11,810,058
Disclosure Of Difference Between Carrying Amount And Contractual Cash Flow Amount Of Financial Liabilities Designated At Fair ValueT hrough Profit Or Loss Explanatory	Difference between the carrying amount and contractual cash flow amount of financial liabilities designated at fair value through profit or loss as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Contractual cash flow amount ￦ 12,515,734 ￦ 9,583,186 Carrying amount 12,704,826 9,784,107 Difference ￦ (189,092 ) ￦ (200,921 )

Deposits(Table)

Deposits(Table)	12 Months Ended
	Dec. 31, 2020
Deposits From Customers Abstract [Abstract]
Deposit Liabilities Type Table Text Block [Text Block]	Details of deposits as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Demand deposits Demand deposits in Korean won ￦ 127,790,349 ￦ 162,155,728 Demand deposits in foreign currencies 8,550,068 14,473,832 136,340,417 176,629,560 Time deposits Time deposits in Korean won 157,653,603 149,435,968 157,653,603 149,435,968 Time deposits in foreign currencies 7,377,173 10,043,679 Fair value adjustments on fair value hedged time deposits in foreign currencies (18,391 ) 2,089 7,358,782 10,045,768 165,012,385 159,481,736 Certificates of deposits 4,239,969 2,468,924 ￦ 305,592,771 ￦ 338,580,220

Borrowings(Table)

Borrowings(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Detailed Information About Borrowings Abstract [Abstract]
Schedule Of Debt Table Text Block [Text Block]	Details of borrowings as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) General borrowings ￦ 24,370,567 ￦ 32,312,859 Bonds sold under repurchase agreements and others 13,015,506 16,334,365 Call money 432,787 1,179,932 ￦ 37,818,860 ￦ 49,827,156
Schedule Of Details Of Borrowings Table Text Block [Text Block]	Details of general borrowings as of December 31, 2019 and 2020, are as follows: Lenders Annual December 31, 2019 December 31, 2020 (In millions of Korean won) Borrowings in Korean won Borrowings from the Bank of Korea The Bank of Korea 0.25 ￦ 2,649,851 ￦ 6,463,267 Borrowings from the government SEMAS and others 0.00 ~ 2.70 1,658,810 2,675,568 Borrowings from banks Shinhan Bank and others 1.55 ~ 3.01 116,160 137,952 Borrowings from non-banking Korea Securities Finance Corporation and others 0.20 ~ 4.74 1,982,242 2,203,702 Other borrowings The Korea Development Bank and others 0.00 ~ 5.20 8,022,921 9,717,382 14,429,984 21,197,871 Borrowings in foreign currencies Due to banks Commonwealth Bank of Australia and others — 4,682 292 Borrowings from banks Central Bank of Uzbekistan and others 0.00 ~ 8.84 8,089,368 9,839,110 Borrowings from other financial institutions The Export-Import Bank of Korea and others 0.70 ~ 1.47 7,081 23,827 Other borrowings Bank of New York Mellon and others 0.00 ~ 2.80 1,839,452 1,251,759 9,940,583 11,114,988 ￦ 24,370,567 ￦ 32,312,859
Schedule Of Repurchase Agreements	Details of bonds sold under repurchase agreements and others as of December 31, 2019 and 2020, are as follows: Lenders Annual December 31, 2019 December 31, 2020 (In millions of Korean won) Bonds sold under repurchase agreements Individuals, groups and corporations 0.25~3.00 ￦ 13,011,121 ￦ 16,329,799 Bills sold Counter sale 0.10~0.35 4,385 4,566 ￦ 13,015,506 ￦ 16,334,365
Schedule Of Details Of Call Money Table Text Block [Text Block]	Details of call money as of December 31, 2019 and 2020, are as follows: Lenders Annual December 31, 2019 December 31, 2020 (In millions of Korean won) Call money in Korean won The Export-Import Bank of Korea and others 0.48~0.85 ￦ 165,000 ￦ 510,000 Call money in foreign currencies Central Bank of Uzbekistan and others 0.00~0.34 267,787 669,932 ￦ 432,787 ￦ 1,179,932

Debentures(Table)

Debentures(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Detailed Information About Debentures Abstract [Abstract]
Schedule Of Details Of Debentures Table Text Block [Text Block]	Details of debentures as of December 31, 2019 and 2020, are as follows: Annual December 31, 2019 December 31, 2020 (In millions of Korean won) Debentures in Korean won Structured debentures 5.65 ~ 5.86 ￦ 33,310 ￦ 1,960 Exchangeable bonds* 0.00 — 240,000 Subordinated fixed rate debentures 2.02 ~ 4.35 3,386,590 4,834,407 Fixed rate debentures 0.00 ~ 3.50 40,596,755 47,229,619 Floating rate debentures 0.58 ~ 1.55 1,580,000 3,190,000 45,596,655 55,495,986 Fair value adjustments of fair value hedged debentures in Korean won 21,070 (6,839 ) Less: Discount on debentures in Korean won (30,029 ) (32,028 ) Less: Adjustment for exchangeable rights in Korean won — (14,957 ) 45,587,696 55,442,162 Debentures in foreign currencies Floating rate debentures 0.58 ~ 1.51 2,227,607 2,232,938 Fixed rate debentures 0.05 ~ 13.50 3,094,196 5,030,580 5,321,803 7,263,518 Fair value adjustments of fair value hedged debentures in foreign currencies 41,406 81,333 Less: Discount on debentures in foreign currencies (15,322 ) (26,326 ) 5,347,887 7,318,525 ￦ 50,935,583 ￦ 62,760,687 * Fair value of the liability component of exchangeable bonds is calculated by using market interest rates of bonds under the same conditions without the exchangeable rights. The residual amount after deducting the liability component from the issuance amount, represents the value of the exchangeable rights and is recorded in equity. Shares to be exchanged are 5 million treasury shares of KB Financial Group Inc. with the exchange price of ￦ 48,000. Exercise period for exchangeable rights is from the 60th day from the issuance date to 10 days before the maturity date.
Schedule Of Changes In Debentures Based On Face Value Table Text Block [Text Block]	Changes in debentures based on face value for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Issue Repayment Others Ending (In millions of Korean won) Debentures in Korean won Structured debentures ￦ 34,320 ￦ — ￦ (1,010 ) ￦ — ￦ 33,310 Subordinated fixed rate debentures 3,437,729 — (51,139 ) — 3,386,590 Fixed rate debentures 43,466,085 91,960,041 (94,829,371 ) — 40,596,755 Floating rate debentures 1,650,000 570,000 (640,000 ) — 1,580,000 48,588,134 92,530,041 (95,521,520 ) — 45,596,655 Debentures in foreign currencies Floating rate debentures 1,791,868 532,380 (33,199 ) (63,442 ) 2,227,607 Fixed rate debentures 2,951,251 595,490 (590,950 ) 138,405 3,094,196 4,743,119 1,127,870 (624,149 ) 74,963 5,321,803 ￦ 53,331,253 ￦ 93,657,911 ￦ (96,145,669 ) ￦ 74,963 ￦ 50,918,458 2020 Beginning Issue Repayment Business Others Ending (In millions of Korean won) Debentures in Korean won Structured debentures ￦ 33,310 ￦ — ￦ (1,350 ) ￦ — ￦ (30,000 ) ￦ 1,960 Exchangeable bonds — 240,000 — — — 240,000 Subordinated fixed rate debentures 3,386,590 2,150,000 (702,183 ) — — 4,834,407 Fixed rate debentures 40,596,755 111,677,084 (105,044,220 ) — — 47,229,619 Floating rate debentures 1,580,000 2,010,000 (400,000 ) — — 3,190,000 45,596,655 116,077,084 (106,147,753 ) — (30,000 ) 55,495,986 Debentures in foreign currencies Floating rate debentures 2,227,607 823,478 (675,075 ) — (143,072 ) 2,232,938 Fixed rate debentures 3,094,196 2,909,967 (937,972 ) 277,087 (312,698 ) 5,030,580 5,321,803 3,733,445 (1,613,047 ) 277,087 (455,770 ) 7,263,518 ￦ 50,918,458 ￦ 119,810,529 ￦ (107,760,800 ) ￦ 277,087 ￦ (485,770 ) ￦ 62,759,504

Provisions(Table)

Provisions(Table)	12 Months Ended
	Dec. 31, 2020
Provisions Abstract [Abstract]
Disclosure Of Other Provisions Explanatory	Details of provisions as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Provisions for credit losses of unused loan commitments ￦ 208,148 ￦ 298,753 Provisions for credit losses of acceptances and guarantees 77,759 62,254 Provisions for credit losses of financial guarantee contracts 6,063 6,348 Provisions for restoration costs 120,340 151,696 Others 115,619 195,852 ￦ 527,929 ￦ 714,903 Changes in provisions for credit losses of unused loan commitments, acceptances and guarantees for the years ended December 31, 2019 and 2020, are as follows: 2019 Provisions for credit losses of unused Provisions for credit losses of 12-month Lifetime expected 12-month Lifetime expected Non- impaired Impaired Non- impaired Impaired (In millions of Korean won) Beginning ￦ 132,876 ￦ 68,920 ￦ 8,881 ￦ 27,084 ￦ 30,109 ￦ 17,982 Transfer between stages Transfer to 12-month 32,622 (31,408 ) (1,214 ) 365 (365 ) — Transfer to lifetime expected credit losses (16,932 ) 17,195 (263 ) (975 ) 1,705 (729 ) Impairment (422 ) (1,516 ) 1,938 (24 ) (280 ) 304 Provision (reversal) for credit losses (21,171 ) 18,036 45 (1,763 ) 4,584 (893 ) Others (exchange differences, etc.) 324 237 — 274 259 122 Ending ￦ 127,297 ￦ 71,464 ￦ 9,387 ￦ 24,961 ￦ 36,012 ￦ 16,786 2020 Provisions for credit losses of unused Provisions for credit losses of 12-month Lifetime expected credit losses 12-month Lifetime expected credit losses Non- impaired Impaired Non- impaired Impaired (In millions of Korean won) Beginning ￦ 127,297 ￦ 71,464 ￦ 9,387 ￦ 24,961 ￦ 36,012 ￦ 16,786 Transfer between stages Transfer to 12-month 23,318 (21,694 ) (1,624 ) 194 (191 ) (3 ) Transfer to lifetime expected credit losses (13,431 ) 15,991 (2,560 ) (486 ) 486 — Impairment (304 ) (3,474 ) 3,778 (5 ) (461 ) 466 Provision (reversal) for credit losses* 24,583 65,449 (412 ) 9,482 (20,389 ) (2,734 ) Business combination 19,426 — — — — — Others (exchange differences, etc.) (18,168 ) (273 ) — (1,058 ) (619 ) (187 ) Ending ￦ 162,721 ￦ 127,463 ￦ 8,569 ￦ 33,088 ￦ 14,838 ￦ 14,328 * Includes additional provision of ￦ 14,974 million for industries and borrowers which are highly affected by COVID-19, (non-impaired) Changes in provisions for credit losses of financial guarantee contracts for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 (In millions of Beginning ￦ 4,275 ￦ 6,063 Provision 1,865 280 Others (77 ) 5 Ending ￦ 6,063 ￦ 6,348 Changes in provisions for restoration costs for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 (In millions of Korean won) Beginning ￦ 108,000 ￦ 120,340 Provision 7,037 14,192 Reversal (7,178 ) (2,010 ) Used (5,211 ) (9,469 ) Unwinding of discount 2,237 2,372 Effect of changes in discount rate 15,455 23,886 Business combination — 2,385 Ending ￦ 120,340 ￦ 151,696 Provisions for restoration costs are the present value of estimated costs to be incurred for the restoration of the leased properties. The expenditure of the restoration cost will be incurred at the end of each lease contract, and the lease period is used to reasonably estimate the time of expenditure. Also, the average restoration expense based on actual three-year historical data and three-year historical average inflation rate were used to estimate the present value of estimated costs. Changes in other provisions for the years ended December 31, 2019 and 2020, are as follows: 2019 Membership Dormant Litigations Others* Total (In millions of Korean won) Beginning ￦ 12,654 ￦ 4,377 ￦ 21,190 ￦ 89,511 ￦ 127,732 Increase 56,758 2,378 23,863 38,025 121,024 Decrease (54,743 ) (3,176 ) (16,363 ) (58,855 ) (133,137 ) Ending ￦ 14,669 ￦ 3,579 ￦ 28,690 ￦ 68,681 ￦ 115,619 2020 Membership Dormant Litigations Others* Total (In millions of Korean won) Beginning ￦ 14,669 ￦ 3,579 ￦ 28,690 ￦ 68,681 ￦ 115,619 Increase 76,138 2,607 19,186 89,361 187,292 Decrease (71,306 ) (3,179 ) (9,725 ) (28,173 ) (112,383 ) Business combination — — 2,366 2,958 5,324 Ending ￦ 19,501 ￦ 3,007 ￦ 40,517 ￦ 132,827 ￦ 195,852 * Provisions for incomplete sales of cardssurance are ￦ 2,532 million and ￦ 1,319 million, as of December 31, 2019 and 2020, respectively.

Net Defined Benefit Liabiliti_2

Net Defined Benefit Liabilities(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Defined Benefit Plans Abstract [Abstract]
Schedule Of Defined Benefit Plans Disclosures Text Block [Text Block]	Changes in net defined benefit liabilities for the years ended December 31, 2019 and 2020, are as follows: 2019 Present value of Fair value of plan Net defined benefit (In millions of Korean won) Beginning ￦ 2,172,260 ￦ (1,910,047 ) ￦ 262,213 Current service cost 226,788 — 226,788 Past service cost 2,276 — 2,276 Interest expense (income) 48,795 (43,250 ) 5,545 Remeasurements: Actuarial gains or losses by changes in demographic assumptions (3,122 ) — (3,122 ) Actuarial gains or losses by changes in financial assumptions 61,547 — 61,547 Actuarial gains or losses by experience adjustments 7,458 — 7,458 Return on plan assets (excluding amounts included in interest income) — 11,116 11,116 Contributions by the Group — (288,420 ) (288,420 ) Payments from plans (benefit payments) (141,820 ) 141,798 (22 ) Payments from the Group (32,556 ) — (32,556 ) Transfer in 7,775 (7,425 ) 350 Transfer out (7,517 ) 7,517 — Effect of exchange differences (2 ) — (2 ) Others (129 ) 1 (128 ) Ending* ￦ 2,341,753 ￦ (2,088,710 ) ￦ 253,043 2020 Present value of Fair value of plan Net defined benefit (In millions of Korean won) Beginning ￦ 2,341,753 ￦ (2,088,710 ) ￦ 253,043 Current service cost 232,147 — 232,147 Past service cost 3,269 — 3,269 Gains on settlement (1,912 ) — (1,912 ) Interest expense (income) 46,178 (41,435 ) 4,743 Remeasurements: Actuarial gains and losses by changes in demographic assumptions (9,611 ) — (9,611 ) Actuarial gains and losses by changes in financial assumptions 789 — 789 Actuarial gains and losses by experience adjustments 16,292 — 16,292 Return on plan assets (excluding amounts included in interest income) — 6,308 6,308 Contributions by the Group — (268,918 ) (268,918 ) Contributions by the employees — (248 ) (248 ) Payments from plans (settlement) (8,162 ) 8,162 — Payments from plans (benefit payments) (148,468 ) 144,546 (3,922 ) Payments from the Group (34,361 ) — (34,361 ) Transfer in 9,673 (9,027 ) 646 Transfer out (8,635 ) 8,635 — Effect of exchange differences (724 ) 5 (719 ) Effect of business acquisition and disposal 110,080 (62,271 ) 47,809 Others 26 — 26 Ending* ￦ 2,548,334 ￦ (2,302,953 ) ￦ 245,381 * The net defined benefit liabilities of ￦ 253,043 million is calculated by subtracting ￦ 946 million net defined benefit assets from ￦ 253,989 million net defined benefit liabilities as of December 31, 2019. The net defined benefit liabilities of ￦ 245,381 million is calculated by subtracting ￦ 2,845 million net defined benefit assets from ￦ 248,226 million net defined benefit liabilities as of December 31, 2020.
Disclosure Of Net Defined Benefit Liability Asset Explanatory	Details of net defined benefit liabilities as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Present value of defined benefit obligation ￦ 2,341,753 ￦ 2,548,334 Fair value of plan assets (2,088,710 ) (2,302,953 ) Net defined benefit liabilities ￦ 253,043 ￦ 245,381
Schedule Of Net Benefit Costs Table Text Block [Text Block]	Details of post-employment benefits recognized in profit or loss as employee compensation and benefits for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Current service cost ￦ 208,470 ￦ 226,788 ￦ 232,147 Past service cost 7,912 2,276 3,269 Net interest expenses on net defined benefit liabilities 3,833 5,545 4,743 Gains on settlement (1,000 ) — (1,912 ) Post-employment benefits * ￦ 219,215 ￦ 234,609 ￦ 238,247 * Includes post-employment benefits amounting to ￦ 2,575 million recognized as other operating expense and ￦ 121 million recognized as prepayment for the year ended December 31, 2019 and post-employment benefits amounting to ￦ 2,840 million recognized as other operating expense and ￦ 176 million recognized as prepayment for the year ended December 31, 2020.
Schedule Of Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Table Text Block [Text Block]	Details of remeasurements of net defined benefit liabilities recognized as other comprehensive income (loss) for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Remeasurements: Return on plan assets (excluding amounts included in interest income) ￦ (22,420 ) ￦ (11,116 ) ￦ (6,308 ) Actuarial gains or losses (167,973 ) (65,883 ) (7,470 ) Income tax effects 52,377 21,172 3,792 Effect of exchange difference — — (399 ) Remeasurements after income tax ￦ (138,016 ) ￦ (55,827 ) ￦ (10,385 )
Disclosure Of Fair Value Of Plan Assets Explanatory	Details of fair value of plan assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 Assets quoted Assets not Total (In millions of Korean won) Cash and due from financial institutions ￦ — ￦ 2,087,861 ￦ 2,087,861 Investment fund — 849 849 ￦ — ￦ 2,088,710 ￦ 2,088,710 December 31, 2020 Assets quoted Assets not Total (In millions of Korean won) Cash and due from financial institutions ￦ — ￦ 2,299,500 ￦ 2,299,500 Derivative instruments — 1,930 1,930 Investment fund — 1,523 1,523 ￦ — ￦ 2,302,953 ￦ 2,302,953
Schedule Of Assumptions Used Table Text Block [Text Block]	Details of key actuarial assumptions used as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 Discount rate (%) 1.60~2.00 0.90~2.00 Salary increase rate (%) 0.00~7.50 0.00~7.50 Turnover (%) 0.00~50.00 0.00~50.00 Mortality assumptions are based on the experience-based mortality table issued by Korea Insurance Development Institute in 2019.
Disclosure Of Sensitivity Analysis For Actuarial Assumptions Explanatory	Sensitivity analysis results of significant actuarial assumptions as of December 31, 2020, are as follows: Changes in principal Effect on net defined benefit obligation Increase in principal Decrease in principal Discount rate 0.5 %p 4.34% decrease 4.12% increase Salary increase rate 0.5 %p 1.41% increase 6.41% decrease Turnover 0.5 %p 0.94% decrease 0.39% increase The above sensitivity analyses are based on a change in an assumption while holding all other assumptions constant. In practice, this is unlikely to occur, and changes in some of the assumptions may be correlated. The sensitivity of the defined benefit obligation to changes in principal actuarial assumptions is calculated using the same projected unit credit method used in calculating the defined benefit obligations recognized in the consolidated statement of financial position.
Disclosure Of Information About Maturity Profile Of Defined Benefit Obligation Explanatory	Expected maturity analysis of undiscounted pension benefits (including expected future benefit) as of December 31, 2020 are as follows: Up to 1 year 1~2 years 2~5 years 5~10 years Over 10 years Total (In millions of Korean won) Pension benefits* ￦ 98,050 ￦ 182,432 ￦ 706,187 ￦ 1,415,615 ￦ 3,829,749 ￦ 6,232,033 * Amount determined under the promotion compensation type defined contribution plan is excluded. The weighted average duration of the defined benefit obligation is 1.0 ~ 11.5 years . Expected contribution to plan assets for the next annual reporting period after December 31, 2020 is estimated to be ￦ 221,271 million.

Other Liabilities(Table)

Other Liabilities(Table)	12 Months Ended
	Dec. 31, 2020
Miscellaneous Liabilities Abstract [Abstract]
Disclosure Of Accrued Expenses And Other Liabilities Explanatory	Details of other liabilities as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Other financial liabilities Other payables ￦ 9,485,597 ￦ 14,247,067 Prepaid card and debit card payables 27,555 31,184 Accrued expenses 3,066,445 2,787,360 Financial guarantee liabilities 46,428 49,286 Deposits for letter of guarantees and others 862,968 1,103,876 Domestic exchange settlement credits 2,079,636 938,039 Foreign exchanges settlement credits 114,316 134,678 Borrowings from other business accounts 256 — Due to trust accounts 5,216,460 7,542,955 Liabilities incurred from agency relationships 771,609 765,844 Account for agency businesses 407,475 400,507 Dividend payables 473 478 Lease liabilities 544,439 559,113 Others 5,930 51,901 22,629,587 28,612,288 Other non-financial Other payables 283,771 386,094 Unearned revenue 465,501 669,908 Accrued expenses 716,180 815,941 Deferred revenue on credit card points 206,188 211,815 Withholding taxes 158,992 180,092 Separate account liabilities 5,047,080 10,701,404 Others 229,960 226,481 7,107,672 13,191,735 ￦ 29,737,259 ￦ 41,804,023

Equity(Table)

Equity(Table)	12 Months Ended
	Dec. 31, 2020
Equity Abstract [Abstract]
Disclosure Of Issued Capital Explanatory	Details of share capital as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 Type of share Ordinary share Ordinary share (In millions of Korean won and in number of shares) Number of authorized shares 1,000,000,000 1,000,000,000 Par value per share (In Korean won) ￦ 5,000 ￦ 5,000 Number of issued shares 415,807,920 415,807,920 Share capital ￦ 2,090,558 ￦ 2,090,558 Changes in outstanding shares for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 (In number of shares) Beginning 395,551,297 389,634,335 Increase — — Decrease (5,916,962 ) — Ending 389,634,335 389,634,335
Schedule Of Hybrid Securities [Text Block]	Details of hybrid securities classified as equity as of December 31, 2019 and 2020, are as follows: Issuance date Maturity Interest rate December 31, 2019 December 31, 2020 (In millions of Korean won) The 1-1st May 2, 2019 Perpetual bond 3.23 ￦349,309 ￦349,309 The 1-2nd May 2, 2019 Perpetual bond 3.44 49,896 49,896 The 2-1st Hybrid securities May 8, 2020 Perpetual bond 3.30 — 324,099 The 2-2nd May 8, 2020 Perpetual bond 3.43 — 74,812 The 3-1st July 14, 2020 Perpetual bond 3.17 — 369,099 The 3-2nd July 14, 2020 Perpetual bond 3.38 — 29,922 The 4-1st Oct 20, 2020 Perpetual bond 3.00 — 433,996 The 4-2nd Oct 20, 2020 Perpetual bond 3.28 — 64,855 ￦399,205 ￦1,695,988 The above hybrid securities are early redeemable by the Group after 5 or 10 years from the issuance date. On the other hand, hybrid securities of ￦ 574,580 million issued by Kookmin Bank are recognized as non-controlling
Disclosure Of Reserves And Other Equity Interest Explanatory	Details of capital surplus as of December 31, 2019 and 2020, are as follows December 31, 2019 December 31, 2020 (In millions of Korean won) Paid-in ￦ 13,190,274 ￦ 13,190,274 Loss on sales of treasury shares (481,332 ) (481,332 ) Other capital surplus 4,413,835 4,002,714 Consideration for exchangeable rights — 11,933 ￦ 17,122,777 ￦ 16,723,589
Schedule Of Accumulated Other Comprehensive Income Loss [Text Block]	Details of accumulated other comprehensive income as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Remeasurements of net defined benefit liabilities ￦ (290,228 ) ￦ (300,324 ) Exchange differences on translating foreign operations 31,793 (131,113 ) Net gains on financial instruments at fair value through other comprehensive income 487,331 717,230 Share of other comprehensive income (loss) of associates and joint ventures 3,318 (3,529 ) Losses on cash flow hedging instruments (27,333 ) (28,597 ) Gains (losses) on hedging instruments of net investments in foreign operations (41,992 ) 22,277 Other comprehensive income arising from separate account 18,381 8,698 Fair value changes on financial liabilities designated at fair value due to own credit risk (20,326 ) (11,507 ) Net gains on overlay approach adjustment 187,077 339,202 ￦ 348,021 ￦ 612,337
Schedule Of Appropriated And Unappropriated Retained Earnings [Text Block]	Details of retained earnings as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 2 (In millions of Korean won) Legal reserves 1 ￦ 482,807 ￦ 557,405 Voluntary reserves 982,000 982,000 Unappropriated retained earnings 18,244,738 20,977,987 ￦ 19,709,545 ￦ 22,517,392 1 With respect to the allocation of net profit earned in a fiscal term, the Parent Company must set aside in its legal reserve an amount equal to at least 10% of its profit after tax as reported in the financial statements, each time it pays dividends on its net profits earned until its legal reserve reaches at least the aggregate amount of its paid-in 2 Retained earnings restricted for dividend at subsidiaries level pursuant to law and regulations amounts to ￦ 3,587,439 million as of December 31, 2020.
Disclosure Of Treasury Shares Explanatory	Changes in treasury shares for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Acquisition Disposal Ending (In millions of Korean won and in number of shares) Number of treasury shares 22,560,240 5,916,962 (2,303,617 ) 26,173,585 Carrying amount ￦ 968,549 ￦ 267,639 ￦ (100,000 ) ￦ 1,136,188 2020 Beginning Acquisition Disposal Ending (In millions of Korean won and in number of shares) Number of treasury shares* 26,173,585 — — 26,173,585 Carrying amount ￦ 1,136,188 ￦ — ￦ — ￦ 1,136,188 * 5,000,000 treasury shares are deposited at the Korea Securities Depository for issuing exchangeable bonds.

Net Interest Income(Table)

Net Interest Income(Table)	12 Months Ended
	Dec. 31, 2020
Interest Revenue Or Expense Net Abstract [Abstract]
Interest Income And Interest Expense Disclosure Table Text Block [Text Block]	Details of interest income, expense and net interest income for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Interest income Due from financial institutions measured at fair value through profit or loss ￦ 9,236 ￦ 2,685 ￦ 649 Securities measured at fair value through profit or loss 713,058 668,377 647,840 Loans measured at fair value through profit or loss 26,066 33,001 10,876 Securities measured at fair value through other comprehensive income 718,327 774,864 719,434 Loans measured at fair value through other comprehensive income 2,373 14,708 7,899 Due from financial institutions measured at amortized cost 109,155 150,635 92,155 Securities measured at amortized cost 604,709 599,519 627,201 Loans measured at amortized cost 11,431,359 12,247,493 12,177,822 Others 120,286 147,905 201,871 13,734,569 14,639,187 14,485,747 Interest expenses Deposits 3,041,739 3,481,121 2,916,794 Borrowings 544,562 596,425 572,946 Debentures 1,148,729 1,240,566 1,186,310 Others 94,611 124,288 87,423 4,829,641 5,442,400 4,763,473 Net interest income ￦ 8,904,928 ￦ 9,196,787 ￦ 9,722,274
Interest Income Recognized On Impaired Loans Explanatory	Interest income recognized on impaired loans is ￦48,974 million, ￦ 54,033 million and ￦ 56,606 million for the years ended December 31, 2018, 2019 and 2020, respectively.

Net Fee And Commission Income(T

Net Fee And Commission Income(Table)	12 Months Ended
	Dec. 31, 2020
Fee And Commission Income Expense Abstract [Abstract]
Schedule Of Details Of Fee And Commission Income And Expense Table Text Block [Text Block]	Details of fee and commission income, expense and net fee and commission income for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Fee and commission income Banking activity fees ￦ 208,443 ￦ 214,512 ￦ 189,100 Lending activity fees 74,340 83,916 91,663 Credit card and debit card related fees 1,360,515 1,316,636 1,378,450 Agent activity fees 149,585 172,211 196,518 Trust and other fiduciary fees 363,767 388,352 331,827 Fund management related fees 132,657 153,798 154,612 Acceptances and guarantees fees 44,104 48,122 54,108 Foreign currency related fees 124,201 134,145 173,313 Securities agency fees 167,071 145,846 172,097 Other business account commission on consignment 36,947 36,813 40,461 Commissions received on securities business 518,309 445,987 793,278 Lease fees 246,537 428,195 636,301 Others 291,244 310,714 315,296 3,717,720 3,879,247 4,527,024 Fee and commission expense Trading activity related fees* 31,889 28,869 38,497 Lending activity fees 25,734 26,040 33,444 Credit card and debit card related fees 907,831 892,391 848,823 Outsourcing related fees 164,594 190,312 216,962 Foreign currency related fees 43,053 42,902 49,435 Others 301,243 343,729 380,924 1,474,344 1,524,243 1,568,085 Net fee and commission income ￦ 2,243,376 ￦ 2,355,004 ￦ 2,958,939 * Fees from financial instruments at fair value through profit or loss.

Net Gains or Losses on Financ_2

Net Gains or Losses on Financial Instruments at Fair Value Through Profit or Loss(Table)	12 Months Ended
	Dec. 31, 2020
Net Gains Or Losses On Financial Assets Liabilities At Fair Value Through Profit Or Loss Abstract [Abstract]
Schedule Of Net Gains Or Losses On Financial Instruments Held For Trading Table Text Block [Text Block]	Net gains or losses on financial instruments at fair value through profit or loss include dividend income and gains or losses arising from changes in fair values, sales and redemptions. Details of net gains or losses on financial instruments at fair value through profit or loss for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Gains on financial instruments at fair value through profit or loss Financial assets at fair value through profit or loss Debt securities ￦ 1,544,892 ￦ 1,613,946 ￦ 2,061,505 Equity securities 571,404 428,646 725,072 2,116,296 2,042,592 2,786,577 Derivatives held for trading Interest rate 2,328,576 2,685,998 2,632,246 Currency 3,764,985 5,251,597 8,335,594 Stock or stock index 1,383,446 2,612,422 2,808,284 Credit 38,461 41,548 28,434 Commodity 8,285 15,240 18,097 Other 92,947 212,731 231,901 7,616,700 10,819,536 14,054,556 Financial liabilities at fair value through profit or loss 72,410 46,750 28,160 Other financial instruments 22 5,811 689 9,805,428 12,914,689 16,869,982 Losses on financial instruments at fair value through profit or loss Financial assets at fair value through profit or loss Debt securities 850,129 752,999 1,040,285 Equity securities 475,968 315,743 444,554 1,326,097 1,068,742 1,484,839 Derivatives held for trading Interest rate 2,610,305 2,758,205 2,687,114 Currency 3,499,356 5,118,095 8,191,456 Stock or stock index 1,626,007 1,585,086 2,558,205 Credit 36,747 42,172 19,213 Commodity 10,456 9,437 21,797 Other 117,741 190,979 253,406 7,900,612 9,703,974 13,731,191 Financial liabilities at fair value through profit or loss 134,287 94,426 153,227 Other financial instruments 60 5,704 116 9,361,056 10,872,846 15,369,373 Net gains on financial instruments at fair value through profit or loss ￦ 444,372 ￦ 2,041,843 ￦ 1,500,609
Schedule Of Net Gains Or Losses On Financial Instruments Designated At Fair Value Through Profit Or Loss Table Text Block [Text Block]	Net gains or losses on financial instruments designated at fair value through profit or loss include dividend income and gains or losses arising from changes in fair values, sales and redemptions. Details of net gains or losses on financial instruments designated at fair value through profit or loss for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Gains on financial instruments designated at fair value through profit or loss Financial liabilities designated at fair value through profit or loss ￦ 667,508 ￦ 555,749 ￦ 654,045 667,508 555,749 654,045 Losses on financial instruments designated at fair value through profit or loss Financial liabilities designated at fair value through profit or loss 760,577 1,953,720 1,143,288 760,577 1,953,720 1,143,288 Net losses on financial instruments designated at fair value through profit or loss ￦ (93,069 ) ￦ (1,397,971 ) ￦ (489,243 )

Net Other Operating Income An_2

Net Other Operating Income And Expenses(Table)	12 Months Ended
	Dec. 31, 2020
Other Operating Income And Expenses Abstract [Abstract]
Other Operating Income And Expense Text Block [Text Block]	Details of other operating income and expenses for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Other operating income Gains related to financial instruments at fair value through other comprehensive income Gains on redemption of financial instruments at fair value through other comprehensive income ￦ 259 ￦ 796 ￦ 351 Gains on disposal of financial instruments at fair value through other comprehensive income 134,875 222,371 304,217 135,134 223,167 304,568 Gains related to financial assets at amortized cost Gains on sale of loans measured at amortized cost 46,877 80,746 180,038 Gains on disposal of securities measured at amortized cost — — 229 46,877 80,746 180,267 Gains on foreign exchange transactions 1,600,161 2,183,703 3,634,987 Dividend income 83,930 54,768 45,125 Others 260,709 321,244 591,798 2,126,811 2,863,628 4,756,745 Other operating expenses Losses related to financial instruments at fair value through other comprehensive income Losses on redemption of financial instruments at fair value through other comprehensive income 17 — 320 Losses on disposal of financial instruments at fair value through other comprehensive income 35,864 16,975 19,159 35,881 16,975 19,479 Losses related to financial assets at amortized cost Losses on sale of loans measured at amortized cost 9,006 19,439 16,061 Losses on disposal of securities measured at amortized cost — — 6,513 9,006 19,439 22,574 Losses on foreign exchanges transactions 1,539,837 1,970,294 3,530,618 Others 1,672,123 1,920,244 2,684,004 3,256,847 3,926,952 6,256,675 Net other operating expenses ￦ (1,130,036 ) ￦ (1,063,324 ) ￦ (1,499,930 )

General And Administrative Ex_2

General And Administrative Expenses(Table)	12 Months Ended
	Dec. 31, 2020
General And Administrative Expense Abstract [Abstract]
Schedule Of Details Of General And Administrative Expense Table Text Block [Text Block]	Details of general and administrative expenses for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Employee Benefits Salaries and short-term employee benefits—salaries ￦ 2,512,945 ￦ 2,557,821 ￦ 2,789,201 Salaries and short-term employee benefits—others 870,356 848,421 871,014 Post-employment benefits—defined benefit plans 217,085 231,913 235,231 Post-employment benefits—defined contribution plans 21,056 27,924 37,328 Termination benefits 242,010 239,790 361,098 Share-based payments 10,930 49,418 49,364 3,874,382 3,955,287 4,343,236 Depreciation and amortization 408,771 784,431 874,911 Other general and administrative expenses Rental expense 361,344 109,745 116,325 Tax and dues 214,683 238,670 260,071 Communication 46,661 48,749 53,596 Electricity and utilities 28,823 29,161 32,298 Publication 16,018 15,136 13,988 Repairs and maintenance 22,432 23,947 32,448 Vehicle 12,495 11,537 14,314 Travel 19,393 21,452 12,251 Training 30,310 31,451 27,610 Service fees 210,081 227,631 238,787 Electronic data processing expenses 189,007 258,456 280,773 Advertising 217,244 228,826 236,618 Others 266,868 286,538 295,926 1,635,359 1,531,299 1,615,005 ￦ 5,918,512 ￦ 6,271,017 ￦ 6,833,152
Schedule Of Details Of Stock Grants Linked To Long-term And Short-term Performance [Text Blcok]	Details of stock grants linked to long-term performance as of December 31, 2020, are as follows: Grant date Number of granted 1 Vesting conditions 2 (In number of shares) KB Financial Group Inc. Series 21 Jan. 01, 2019 25,172 Services fulfillment, market performance 3 non-market 4 Series 22 Apr. 01, 2019 3,226 Services fulfillment, market performance 3 non-market 4 Series 23 May 27, 2019 1,436 Services fulfillment, market performance 3 non-market 4 Series 24 Jul. 17, 2019 8,195 Services fulfillment, market performance 3 non-market 4 Series 25 Jan. 01, 2020 57,367 Services fulfillment, market performance 3 non-market 4 Series 26 Mar. 18, 2020 430 Services fulfillment, market performance 3 non-market 4 Series 27 Jun. 15, 2020 187 Services fulfillment, market performance 3 non-market 4 Series 28 Nov. 21, 2020 68,135 Services fulfillment, market performance 3 non-market 5 Deferred grant 2015 7,674 Satisfied 2016 8,705 Satisfied 2017 17,983 Satisfied 2018 5,960 Satisfied 2019 24,533 Satisfied 2020 28,134 Satisfied 257,137 Kookmin Bank Series 75 Jan. 01, 2019 154,996 Services fulfillment, market performance 3 non-market 4 Series 76 Apr. 01, 2019 5,380 Services fulfillment, market performance 3 non-market 4 Series 77 May 27, 2019 4,468 Services fulfillment, market performance 3 non-market 4 Series 78 Nov. 21, 2019 36,443 Services fulfillment, market performance 3 non-market 6 Series 79 Jan. 01, 2020 241,609 Services fulfillment, market performance 3 non-market 4 Series 80 Mar. 01, 2020 7,711 Services fulfillment, market performance 3 non-market 4 Deferred grant 2015 2,759 Satisfied 2016 19,109 Satisfied 2017 47,863 Satisfied 2018 65,514 Satisfied 2019 98,194 Satisfied 684,046 Other subsidiaries Stock granted in 2010 — 106 Services fulfillment, market performance 3 non-market 4 Stock granted in 2011 — 146 Stock granted in 2012 — 420 Stock granted in 2013 — 622 Stock granted in 2014 — 1,028 Stock granted in 2015 — 3,323 Stock granted in 2016 — 9,103 Stock granted in 2017 — 36,814 Stock granted in 2018 — 120,266 Stock granted in 2019 — 331,688 Stock granted in 2020 — 268,669 772,185 1,713,368 1 Granted shares represent the total number of shares initially granted to executives and employees who have residual shares as of December 31, 2020 (Deferred grants are residual shares vested as of December 31, 2020). 2 Executives and employees were given the option of deferred payment of the granted shares (after the date of retirement), payment ratio, and payment period. Accordingly, a certain percentage of the granted amount is deferred for up to five years after the date of retirement after the deferred grant has been confirmed. 3 Relative TSR (Total Shareholders Return): [(Fair value at the end of the contract—Fair value at the beginning of the contract) + (Total amount of dividend per share paid during the contract period)] / Fair value at the beginning of the contract 4 Companies’ and individuals’ performance results 5 EPS, Asset Quality, HCROI, Profit from non-banking 6 EPS, Asset Quality Details of stock grants linked to short-term performance as of December 31, 2020, are as follows: Estimated number Vesting conditions (In number of shares) KB Financial Group Inc. Stock granted in 2015 7,524 Satisfied Stock granted in 2016 6,595 Satisfied Stock granted in 2017 7,385 Satisfied Stock granted in 2018 14,292 Satisfied Stock granted in 2019 28,030 Satisfied Stock granted in 2020 37,300 Proportional to service period Kookmin Bank Stock granted in 2015 9,887 Satisfied Stock granted in 2016 19,662 Satisfied Stock granted in 2017 30,003 Satisfied Stock granted in 2018 73,989 Satisfied Stock granted in 2019 125,530 Satisfied Stock granted in 2020 121,676 Proportional to service period Other subsidiaries Stock granted in 2015 12,191 Satisfied Stock granted in 2016 40,970 Satisfied Stock granted in 2017 149,329 Satisfied Stock granted in 2018 345,546 Satisfied Stock granted in 2019 551,667 Satisfied Stock granted in 2020 290,013 Proportional to service period 1,871,589 * Executives and employees were given the option of deferred payment of the granted shares (after the date of retirement), payment ratio, and payment period. Accordingly, a certain percentage of the granted amount is deferred for up to five years after the date of retirement after the deferred grant has been confirmed.
Schedule Of Share Grants Measured At Fair Value [Text Block]	Stock grants are measured at fair value using the MonteCarlo Simulation Model and assumptions used in determining the fair value as of December 31, 2020, are as follows: Risk-free Fair value (market Fair value (non-market performance (in Korean won) Linked to long-term performance ( KB Financial Group Inc. Series 21 0.74 38,789~45,096 38,789~45,096 Series 22 0.74 37,324~41,899 37,324~41,899 Series 23 0.74 37,324~41,899 37,324~41,899 Series 24 0.74 38,789~45,096 38,789~45,096 Series 25 0.74 37,324~45,096 37,324~45,096 Series 26 0.74 38,789~45,096 38,789~45,096 Series 27 0.74 38,789~45,096 38,789~45,096 Series 28 0.74 30,871~34,675 34,694~38,969 Deferred grant in 2015 0.74 — 35,895~45,096 Deferred grant in 2016 0.74 — 38,789~45,096 Deferred grant in 2017 0.74 — 40,299~45,096 Deferred grant in 2018 0.74 — 38,789~45,096 Deferred grant in 2019 0.74 — 40,299~47,631 Deferred grant in 2020 0.74 — 38,969~42,065 ( Kookmin Bank Series 75 0.74 38,789~45,096 38,789~45,096 Series 76 0.74 37,324~41,899 37,324~41,899 Series 77 0.74 37,324~41,899 37,324~41,899 Series 78 0.74 36,370~40,828 37,324~41,899 Series 79 0.74 37,324~45,096 37,324~45,096 Series 80 0.74 35,895~40,299 35,895~40,299 Grant deferred in 2015 0.74 — 41,899~45,096 Grant deferred in 2016 0.74 — 38,789~45,096 Grant deferred in 2017 0.74 — 38,789~45,096 Grant deferred in 2018 0.74 — 38,789~45,096 Grant deferred in 2019 0.74 — 40,299~45,096 ( Other subsidiaries Stock granted in 2010 0.74 — 40,299~40,299 Stock granted in 2011 0.74 — 40,299~40,299 Stock granted in 2012 0.74 — 40,299~41,899 Stock granted in 2013 0.74 — 35,692~41,899 Stock granted in 2014 0.74 — 41,899~41,899 Stock granted in 2015 0.74 — 34,581~47,631 Stock granted in 2016 0.74 — 37,324~56,293 Stock granted in 2017 0.74 — 34,581~61,294 Stock granted in 2018 0.74 33,612~44,072 35,895~47,631 Stock granted in 2019 0.74 37,324~45,096 34,581~47,631 Stock granted in 2020 0.74 35,780~45,096 35,895~45,096 Risk-free Fair value (Market Fair value (Non-market performance (in Korean won) Linked to short-term performance ( KB Financial Group Inc. Stock granted in 2015 0.74 — 35,895~45,096 Stock granted in 2016 0.74 — 34,581~45,096 Stock granted in 2017 0.74 — 38,789~45,096 Stock granted in 2018 0.74 — 38,789~47,631 Stock granted in 2019 0.74 — 40,299~45,096 Stock granted in 2020 0.74 — 38,789~42,065 (Kookmin Bank) Stock granted in 2015 0.74 — 38,789~47,153 Stock granted in 2016 0.74 — 37,324~61,294 Stock granted in 2017 0.74 — 38,789~47,631 Stock granted in 2018 0.74 — 38,789~47,631 Stock granted in 2019 0.74 — 40,299~45,096 Stock granted in 2020 0.74 — 38,789~41,899 (Other subsidiaries) Stock granted in 2015 0.74 — 34,581~45,096 Stock granted in 2016 0.74 — 34,581~47,631 Stock granted in 2017 0.74 — 34,581~47,631 Stock granted in 2018 0.74 — 34,581~47,631 Stock granted in 2019 0.74 — 34,581~45,096 Stock granted in 2020 0.74 — 35,895~43,147 The Group used the volatility of the stock price over the previous year as the expected volatility, and used the arithmetic mean of the dividend rate of one year before, two years before, and three years before the base year as the dividend rate, and used one-year The accrued expenses for share-based payments related to stocks grants as of December 31, 2019 and 2020, are ￦ 124,853 million and ￦ 135,327 million, respectively, and compensation costs from stock grants amounting to ￦ 49,418 million and ￦ 48,712 million were recognized for the years ended December 31, 2019 and 2020, respectively.
Schedule Of Details Of Mileage Stock Table Text Block [Text Block]	Details of mileage stock as of December 31, 2020, are as follows: Grant date Number of Expected exercise 2 Remaining (In number of shares) Stock granted in 2018 Jan. 10, 2018 19,197 0.00~0.02 13,522 Feb. 12, 2018 9 0.00~0.12 3 Apr. 02, 2018 115 0.00~0.25 82 Apr. 30, 2018 86 0.00~0.33 49 May 08, 2018 170 0.00~0.35 140 Jun. 01, 2018 140 0.00~0.41 106 Jul. 02, 2018 180 0.00~0.50 123 Aug. 07, 2018 194 0.00~0.60 149 Aug. 09, 2018 47 0.00~0.60 31 Aug. 14, 2018 30 0.00~0.62 26 Aug. 16, 2018 130 0.00~0.62 93 Sep. 07, 2018 106 0.00~0.68 77 Oct. 04, 2018 129 0.00~0.76 78 Nov. 01, 2018 258 0.00~0.83 200 Nov. 06, 2018 236 0.00~0.85 168 Dec. 03, 2018 132 0.00~0.92 127 Dec. 04, 2018 21 0.00~0.92 21 Dec. 07, 2018 91 0.00~0.93 78 Dec. 12, 2018 64 0.00~0.95 32 Dec. 18, 2018 271 0.00~0.96 237 Dec. 19, 2018 42 0.00~0.96 34 Dec. 31, 2018 127 0.00~1.00 106 Stock granted in 2019 Jan. 11, 2019 26,580 0.00~1.03 21,231 Feb. 01, 2019 12 0.00~1.08 8 Apr. 01, 2019 167 0.00~1.25 96 Apr. 18, 2019 105 0.00~1.29 81 Apr. 22, 2019 33 0.00~1.30 33 Jul. 01, 2019 109 0.00~1.50 87 Aug. 29, 2019 39 0.00~1.66 39 Sep. 02, 2019 50 0.00~1.67 50 Nov. 01, 2019 119 0.00~1.83 95 Nov. 08, 2019 14 0.00~1.85 14 Dec. 05, 2019 56 0.00~1.93 54 Dec. 06, 2019 84 0.00~1.93 84 Dec. 31, 2019 87 0.00~2.00 87 Stock granted in 2020 Jan. 18, 2020 28,645 0.00~2.05 27,672 May 12, 2020 46 0.00~2.36 46 Jun. 30, 2020 206 0.00~2.50 206 Aug. 26, 2020 40 0.00~2.65 40 Oct. 29, 2020 160 0.00~2.83 160 Nov. 6, 2020 45 0.00~2.85 45 Nov. 30, 2020 35 0.00~2.92 35 Dec. 2, 2020 57 0.00~2.92 57 Dec. 4, 2020 154 0.00~2.93 154 Dec. 30, 2020 88 0.00~3.00 88 78,706 65,944 1 Mileage stock is exercisable for two years after one year from the grant date. When the mileage stock is exercised, the closing price of prior month is applied. However, in case of transfer or retirement during the vesting period, mileage stock is exercisable at the closing price of the last month prior to transfer or retirement. 2 The shares are assessed based on the stock price as of December 31, 2020. These shares are vested immediately at grant date. The accrued expenses for share-based payments related to mileage stock as of December 31, 2019 and 2020, are ￦ 2,705 million and ￦ 2,862 million, respectively. The compensation costs amounting to ￦ 1,334 million and ￦ 1,086 million were recognized as expenses for the years ended December 31, 2019 and 2020, respectively.
Schedule Of Long Term Share Based Payments [Text Block]	Details of long-term share-based payments as of December 31, 2020, are as follows: Grant date Vested shares Expected exercise period (years) Vesting condition Granted in 2020 2020 16,800 3.00 Services fulfillment long-term share-based payments are measured at fair value using the MonteCarlo Simulation Model and assumptions used in determining the fair value as of December 31, 2020, are as follows: Risk-free rate (%) Fair value (Market performance condition) Fair value (Non-market (in Korean won) Granted in 2020 0.741 — 38,789 The Group used the volatility of the stock price over the previous year as the expected volatility, and used the arithmetic mean of the dividend rate of one year before, two years before, and three years before the base year as the dividend rate, and used one-year The accrued expenses for long-term share-based payments as of December 31, 2020 are ￦ 652 million. The compensation costs amounting to ￦ 652 million were recognized as expenses for the year ended December 31, 2020.

Non-operating Income and Expe_2

Non-operating Income and Expenses(Table)	12 Months Ended
	Dec. 31, 2020
Non Operating Income And Expenses [Abstract]
Schedule Of Other Nonoperating Income Expense Table Text Block [Text Block]	Details of non-operating 2018 2019 2020 (In millions of Korean won) Non-operating Gains on disposal of property and equipment ￦ 34,238 ￦ 35,747 ￦ 111,132 Rental income 55,321 85,720 113,075 Gain on a bargain purchase — — 145,067 Gain on sales of disposal group held for sale 118,716 2,731 — Others 37,122 84,793 96,931 245,397 208,991 466,205 Non-operating Losses on disposal of property and equipment 6,131 8,587 11,945 Donation 130,249 102,711 113,083 Restoration costs 4,386 2,902 5,043 Management cost for written-off 3,338 3,382 3,018 Others 91,502 64,523 143,726 235,606 182,105 276,815 Net non-operating ￦ 9,791 ￦ 26,886 ￦ 189,390

Income Tax Expense(Table)

Income Tax Expense(Table)	12 Months Ended
	Dec. 31, 2020
Major Components Of Tax Expense Income Abstract [Abstract]
Schedule Of Components Of Income Tax Expense Benefit Table Text Block [Text Block]	Details of income tax expense for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Tax payable Current tax expense ￦ 1,096,600 ￦ 1,043,047 ￦ 1,099,171 Adjustments of tax of prior years recognized in current tax 22,925 (51,130 ) (13,434 ) 1,119,525 991,917 1,085,737 Changes in deferred income tax assets (liabilities)* 114,345 285,820 323,032 Income tax recognized directly in equity and others Remeasurements of net defined benefit liabilities 52,377 21,172 3,792 Exchange differences on translating foreign operations (13,087 ) (5,714 ) 14,988 Net gains or losses on financial instruments at fair value through other comprehensive income (33,329 ) (13,168 ) (88,907 ) Shares of other comprehensive income or loss of associates and joint ventures 1,374 (3,147 ) 2,976 Gains or losses on cash flow hedging instruments 400 10,537 7,580 Gains or losses on hedging instruments of net investments in foreign operations 10,292 3,194 (24,500 ) Other comprehensive income or loss arising from separate account (10,864 ) (1,301 ) 3,671 Fair value changes on financial liabilities designated at fair value due to own credit risk (563 ) 4,294 (3,350 ) Net gains or losses on overlay approach adjustment (884 ) (72,817 ) (61,637 ) Consideration for exchangeable rights — — (4,526 ) 5,716 (56,950 ) (149,913 ) Others — — 495 Income tax expense ￦ 1,239,586 ￦ 1,220,787 ￦ 1,259,351 * Effect of business combination is excluded.
Schedule Of Effective Income Tax Rate Reconciliation Table Text Block [Text Block]	Analysis of the net profit before income tax and income tax expense for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 Tax rate Amount Tax rate Amount Tax rate Amount (In millions of Korean won) Profit before tax ￦ 4,301,532 ￦ 4,533,986 ￦ 4,761,632 Tax at the applicable tax rate* 27.26 1,172,559 27.27 1,236,484 27.28 1,299,087 Non-taxable (0.28 ) (11,888 ) (0.52 ) (23,601 ) (1.55 ) (73,855 ) Non-deductible 0.64 27,551 0.42 19,086 0.35 16,541 Tax credit and tax exemption (0.01 ) (637 ) (0.01 ) (627 ) (0.08 ) (4,016 ) Temporary difference for which no deferred tax is recognized 0.29 12,260 (0.11 ) (4,860 ) 0.47 22,189 Changes in recognition and measurement of deferred tax (0.06 ) (2,692 ) — (100 ) 0.24 11,616 Income tax refund for tax of prior years (0.19 ) (8,135 ) (0.20 ) (9,105 ) (0.46 ) (22,139 ) Income tax expense of overseas branch 0.09 3,882 0.11 5,004 0.23 10,739 Effects from change in tax rate (0.03 ) (1,470 ) — — — — Others 1.12 48,156 (0.03 ) (1,494 ) (0.02 ) (811 ) Average effective tax rate and tax expense 28.82 ￦ 1,239,586 26.93 ￦ 1,220,787 26.45 ￦ 1,259,351 * Applicable income tax rate for ￦ 200 million and below is 11%, for over ￦ 200 million to ￦ 20 billion is 22%, for over ￦ 20 billion to ￦ 300 billion is 24.2% and for over ￦ 300 billion is 27.5% for the years ended December 31, 2018, 2019 and 2020.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss)(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Analysis Of Other Comprehensive Income By Item Abstract [Abstract]
Schedule Of Changes Of Accumulated Other Comprehensive Income Table Text Block [Text Block]	Changes in accumulated other comprehensive income (loss) for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Changes except for Reclassification Transfer Tax effect Ending (In millions of Korean won) Remeasurements of net defined benefit liabilities ￦ (234,401 ) ￦ (76,999 ) ￦ — ￦ — ￦ 21,172 ￦ (290,228 ) Exchange differences on translating foreign operations (5,784 ) 37,938 5,353 — (5,714 ) 31,793 Net gains on financial instruments at fair value through other comprehensive income 450,694 106,984 (82,662 ) 25,483 (13,168 ) 487,331 Share of other comprehensive income (loss) of associates and joint ventures (4,377 ) 10,842 — — (3,147 ) 3,318 Gains (losses) on cash flow hedging instruments 5,849 (65,323 ) 21,604 — 10,537 (27,333 ) Losses on hedging instruments of net investments in foreign operations (33,092 ) (13,410 ) 1,316 — 3,194 (41,992 ) Other comprehensive income arising from separate account 15,017 21,029 (16,364 ) — (1,301 ) 18,381 Fair value changes on financial liabilities designated at fair value due to own credit risk (8,954 ) (15,666 ) — — 4,294 (20,326 ) Net gains (losses) on overlay approach adjustment (7,146 ) 269,643 (2,603 ) — (72,817 ) 187,077 ￦ 177,806 ￦ 275,038 ￦ (73,356 ) ￦ 25,483 ￦ (56,950 ) ￦ 348,021 2020 Beginning Changes except for Reclassification Transfer to Tax effect Ending (In millions of Korean won) Remeasurements of net defined benefit liabilities ￦ (290,228 ) ￦ (13,888 ) ￦ — ￦ — ￦ 3,792 ￦ (300,324 ) Exchange differences on translating foreign operations 31,793 (177,894 ) — — 14,988 (131,113 ) Net gains on financial instruments at fair value through other comprehensive income 487,331 757,236 (112,020 ) (326,410 ) (88,907 ) 717,230 Share of other comprehensive income (loss) of associates and joint ventures 3,318 (3,923 ) (5,900 ) — 2,976 (3,529 ) Losses on cash flow hedging instruments (27,333 ) (48,034 ) 39,190 — 7,580 (28,597 ) Gains (losses) on hedging instruments of net investments in foreign operations (41,992 ) 88,769 — — (24,500 ) 22,277 Other comprehensive income arising from separate account 18,381 2,834 (16,188 ) — 3,671 8,698 Fair value changes on financial liabilities designated at fair value due to own credit risk (20,326 ) 12,169 — — (3,350 ) (11,507 ) Net gains on overlay approach adjustment 187,077 248,688 (34,926 ) — (61,637 ) 339,202 ￦ 348,021 ￦ 865,957 ￦ (129,844 ) ￦ (326,410 ) ￦ (145,387 ) ￦ 612,337

Earnings Per Share(Table)

Earnings Per Share(Table)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share Abstract [Abstract]
Schedule Of Weighted Average Number Of Shares Table Text Block [Text Block]	Details of weighted average number of ordinary shares outstanding for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (in number of shares) Number of Shares Accumulated Number of Shares Accumulated Number of shares Accumulated Number of issued ordinary shares 418,111,537 152,610,711,005 415,807,920 152,564,638,665 415,807,920 152,185,698,720 Number of treasury shares (22,560,240 ) (7,888,226,378 ) (26,173,585 ) (9,801,574,522 ) (26,173,585 ) (9,579,532,110 ) Average number of ordinary shares outstanding 395,551,297 144,722,484,627 389,634,335 142,763,064,143 389,634,335 142,606,166,610 Number of days 365 365 366 Weighted average number of ordinary shares outstanding 396,499,958 391,131,683 389,634,335
Schedule Of Earnings Per Share Basic By Common Class Text Block [Text Block]	Details of basic earnings per share for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In Korean won and in number of shares) Profit attributable to shareholders of the Parent Company ￦ 3,061,191,387,929 ￦ 3,311,827,412,557 ￦ 3,455,151,501,224 Deduction: Dividends on hybrid securities — 6,512,500,000 22,859,500,000 Profit attributable to the ordinary equity holders of the Parent Company (A) 3,061,191,387,929 3,305,314,912,557 3,432,292,001,224 Weighted average number of ordinary shares outstanding (B) 396,499,958 391,131,683 389,634,335 Basic earnings per share (A/B) ￦ 7,721 ￦ 8,451 ￦ 8,809
Schedule Of Adjusted Profit For Diluted Earnings Per Share Table Text Block [Text Block]	Adjusted profit for diluted earnings per share for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In Korean won) Profit attributable to shareholders of the Parent Company ￦ 3,061,191,387,929 ￦ 3,311,827,412,557 ￦ 3,455,151,501,224 Deduction: Dividends on hybrid securities — 6,512,500,000 22,859,500,000 Profit attributable to ordinary equity holders of the Parent Company 3,061,191,387,929 3,305,314,912,557 3,432,292,001,224 Adjustments: Interest expense on exchangeable bonds — — 798,012,332 Adjusted profit for diluted earnings per share ￦ 3,061,191,387,929 ￦ 3,305,314,912,557 ￦ 3,433,090,013,556
Schedule Of Adjusted Weighted Average Number Of Shares For Diluted Earnings Per Share Table Text Block [Text Block]	Adjusted weighted average number of ordinary shares outstanding for diluted earnings per share for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In number of shares) Weighted average number of ordinary shares outstanding 396,499,958 391,131,683 389,634,335 Adjustment: Stock grants 2,307,630 2,890,513 3,416,737 Exchangeable bonds — — 1,707,650 Adjusted weighted average number of ordinary shares outstanding for diluted earnings per share 398,807,588 394,022,196 394,758,722
Schedule Of Earnings Per Share Diluted By Common Class Text Block [Text Block]	Details of diluted earnings per share for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In Korean won and in number of shares) Adjusted profit for diluted earnings per share ￦ 3,061,191,387,929 ￦ 3,305,314,912,557 ￦ 3,433,090,013,556 Adjusted weighted average number of ordinary shares outstanding for diluted earnings per share 398,807,588 394,022,196 394,758,722 Diluted earnings per share ￦ 7,676 ￦ 8,389 ￦ 8,697

Insurance Contracts(Table)

Insurance Contracts(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Types Of Insurance Contracts Abstract [Abstract]
Disclosure of deferred acquisition costs arising from insurance contracts [text block]	Details of deferred acquisition costs included in other assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Non-life ￦ 786,626 ￦ 965,683 Life insurance 134,739 205,289 ￦ 921,365 ￦ 1,170,972
Schedule of changes in the deferred acquisition costs arising from insurance contracts [text block]	Changes in deferred acquisition costs included in other assets for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Increase Amortization Ending (In millions of Korean won) Non-life ￦ 547,831 ￦ 815,712 ￦ (576,917 ) ￦ 786,626 Life insurance 119,293 117,808 (102,362 ) 134,739 ￦ 667,124 ￦ 933,520 ￦ (679,279 ) ￦ 921,365 2020 Beginning Increase Amortization Ending (In millions of Korean won) Non-life ￦ 786,626 ￦ 872,811 ￦ (693,754 ) ￦ 965,683 Life insurance 134,739 144,429 (73,879 ) 205,289 ￦ 921,365 ￦ 1,017,240 ￦ (767,633 ) ￦ 1,170,972
Disclosure of reinsurance [text block]	Details of reinsurance assets included in other assets as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won) Non-life Reserve for outstanding claims General insurance ￦ 361,065 ￦ 732,579 Automobile insurance 16,555 14,916 Long-term insurance 130,758 156,234 Unearned premium reserve General insurance 208,820 285,634 Automobile insurance 19,952 10,870 737,150 1,200,233 Life insurance Reserve for outstanding claims 1,639 2,081 Unearned premium reserve 408 951 2,047 3,032 Others Reserve for outstanding claims 2,563 2,427 Unearned premium reserve 844 895 3,407 3,322 Total reinsurance assets 742,604 1,206,587 Allowances for impairment 1,953 879 Total reinsurance assets, net ￦ 740,651 ￦ 1,205,708
Schedule of changes in reinsurance assets included in other assets [text block]	Changes in reinsurance assets included in other assets for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Net increase Ending (In millions of Korean won) Non-life Reserve for outstanding claims General insurance ￦ 360,997 ￦ 68 ￦ 361,065 Automobile insurance 18,057 (1,502 ) 16,555 Long-term insurance 109,751 21,007 130,758 Unearned premium reserve General insurance 171,240 37,580 208,820 Automobile insurance 30,864 (10,912 ) 19,952 690,909 46,241 737,150 Life insurance Reserve for outstanding claims 1,912 (273 ) 1,639 Unearned premium reserve 448 (40 ) 408 2,360 (313 ) 2,047 Others Reserve for outstanding claims 3,417 (854 ) 2,563 Unearned premium reserve 983 (139 ) 844 4,400 (993 ) 3,407 Total reinsurance assets 697,669 44,935 742,604 Allowance for impairment 1,916 37 1,953 Total reinsurance assets, net ￦ 695,753 ￦ 44,898 ￦ 740,651 2020 Beginning Net increase Business combination Ending (In millions of Korean won) Non-life Reserve for outstanding claims General insurance ￦ 361,065 ￦ 371,514 ￦ — ￦ 732,579 Automobile insurance 16,555 (1,639 ) — 14,916 Long-term insurance 130,758 25,476 — 156,234 Unearned premium reserve General insurance 208,820 76,814 — 285,634 Automobile insurance 19,952 (9,082 ) — 10,870 737,150 463,083 — 1,200,233 Life insurance Reserve for outstanding claims 1,639 (564 ) 1,006 2,081 Unearned premium reserve 408 (27 ) 570 951 2,047 (591 ) 1,576 3,032 Others Reserve for outstanding claims 2,563 (136 ) — 2,427 Unearned premium reserve 844 51 — 895 3,407 (85 ) — 3,322 Total reinsurance assets 742,604 462,407 1,576 1,206,587 Allowances for impairment 1,953 (1,074 ) — 879 Total reinsurance assets, net ￦ 740,651 ￦ 463,481 ￦ 1,576 ￦ 1,205,708
Disclosure of details of insurance liabilities [text block]	Details of insurance liabilities by insurance types as of December 31, 2019 and 2020, are as follows: December 31, 2019 Non-life insurance Life insurance Others Total (In millions of Korean won) Premium reserve ￦ 23,799,607 ￦ 6,991,247 ￦ — ￦ 30,790,854 Reserve for outstanding claims 2,297,256 101,690 2,563 2,401,509 Unearned premium reserve 1,522,827 4,603 845 1,528,275 Reserve for dividend to policyholders 117,094 29,745 — 146,839 Reserve for distribution of earnings to policyholders 46,901 4,202 — 51,103 Reserve for loss compensation on participating insurance 20,090 5,784 — 25,874 Guarantee reserve — 22,229 — 22,229 ￦ 27,803,775 ￦ 7,159,500 ￦ 3,408 ￦ 34,966,683 December 31, 2020 Non-life insurance Life insurance Others Total (In millions of Korean won) Premium reserve* ￦ 24,990,530 ￦ 23,264,955 ￦ — ￦ 48,255,485 Reserve for outstanding claims 2,885,006 252,883 2,426 3,140,315 Unearned premium reserve 1,859,367 9,450 896 1,869,713 Reserve for dividend to policyholders 129,660 41,024 — 170,684 Reserve for distribution of earnings to policyholders 51,292 5,009 — 56,301 Reserve for loss compensation on participating insurance 20,090 6,818 — 26,908 Guarantee reserve — 895,890 — 895,890 ￦ 29,935,945 ￦ 24,476,029 ￦ 3,322 ￦ 54,415,296 * Negative VOBA amounting to ￦ 2,698,010 million is included.
Schedule of changes in insurance liabilities [text block]	Changes in insurance liabilities for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Net increase 1 Ending (In millions of Korean won) Non-life General insurance ￦ 1,054,823 ￦ 10,090 ￦ 1,064,913 Automobile insurance 1,492,294 131,552 1,623,846 Long-term insurance 23,386,279 1,619,799 25,006,078 Long-term investment contract 110,256 (1,318 ) 108,938 Life insurance Pure endowment insurance 5,233,491 2,637 5,236,128 Death insurance 500,571 142,392 642,963 Endowment insurance 1,621,460 (350,605 ) 1,270,855 Group insurance 735 (211 ) 524 Others 2 8,640 391 9,031 Others 4,400 (993 ) 3,407 ￦ 33,412,949 ￦ 1,553,734 ￦ 34,966,683 2020 Beginning Net increase 1 Business combination Ending (In millions of Korean won) Non-life insurance General insurance ￦ 1,064,913 ￦ 503,828 ￦ — ￦ 1,568,741 Automobile insurance 1,623,846 274,026 — 1,897,872 Long-term insurance 25,006,078 1,356,401 — 26,362,479 Long-term investment contract 108,938 (2,085 ) — 106,853 Life insurance Pure endowment insurance 5,236,128 318,109 2,016,112 7,570,349 Death insurance 642,963 404,456 14,658,632 15,706,051 Endowment insurance 1,270,855 (156,688 ) 74,132 1,188,299 Group insurance 524 (1,021 ) — (497 ) Others 2 9,031 (1,217 ) 4,013 11,827 Others 3,407 (85 ) — 3,322 ￦ 34,966,683 ￦ 2,695,724 ￦ 16,752,889 ￦ 54,415,296 1 Includes exchange differences effect and decrease in liabilities related to investment contract. 2 Includes reserve for distribution of earnings to policyholders and Reserve for loss compensation on participating insurance.
Disclosure Of Assumptions And Basis For The Insurance Liability Adequacy Test [Text Block]	According to the revision of the Regulations on Supervision of Insurance Business, the criteria for the insurance liability adequacy test were changed, and the Group accounted for the change as a change in accounting policy because it provided reliable and more relevant information about current estimates of future cash flows. This change in accounting policy has no effect on the consolidated financial statements, but comparative notes have been restated. KB Insurance Co., Ltd. Assumptions and basis for the insurance liability adequacy test of KB Insurance Co., Ltd. as of December 31, 2019 and 2020, are as follows: Assumptions (%) Calculation basis December 31, December 31, 2020 Long-term insurance Discount rate 1.53~8.34 0.83~15.42 Calculated by applying interest rate scenario which is risk-free rate scenario adjusted by liquidity premium. This is presented by the Financial Supervisory Service Expense ratio 6.60 6.46 Calculated using future expense plan based on the most recent one-year Lapse ratio 1.51~34.13 1.48~35.44 Calculated based on the recent five-year experience statistics Risk ratio 13.1~1,037.3 11.9~1,055.2 Calculated by ratio of insurance claim payments to risk premiums based on the recent seven-year experience statistics General insurance Expense ratio 11.38 10.74 Ratio of maintenance costs incurred to earned premiums by the types of contracts for the most recent one year Claim survey cost ratio 4.54 4.70 Ratio of claim survey cost to insurance claim payments by the type of contracts for the most recent three years Loss ratio 64.95 70.74 Ratio of final loss incurred to earned premiums by the type of contracts for the most recent five years Automobile insurance Expense ratio 9.94 9.00 Ratio of maintenance costs incurred to earned premiums by the types of collaterals for the most recent one year Claim survey cost ratio 8.84 8.40 Ratio of claim survey cost to insurance claim payments by the type of collaterals for the most recent three years Loss ratio 78.44 78.20 Ratio of final loss incurred to earned premiums by the type of collaterals for the most recent five years KB Life Insurance Co., Ltd. Assumptions and basis for the insurance liability adequacy test of KB Life Insurance Co., Ltd. as of December 31, 2019 and 2020, are as follows: Assumptions (%) December 31, 2019 December 31, 2020 Calculation basis Lapse ratio 0~65.39 0~65.50 Ratio of canceled premiums to premiums by product group, method of payment, channel, and elapsed period, based on the most recent five-year experience statistics Loss ratio 11~132 24~156 Ratio of number of accidents to the number of holding insurances, by collateral, gender and elapsed period, based on the most recent seven-year experience statistics Discount rate 1.04~5.79 0.98~15.33 Estimated investment yield based on the interest rate scenario provided by the Financial Supervisory Service adjusted by risk spread Indirect costs included in administration expenses were calculated based on unit cost of the expense allocation standards of the last year in accordance with the Detailed Regulations on Supervision of Insurance Business. Direct costs included in administration expenses were calculated based on estimates of future expense according to the Group’s internal regulations. Prudential Life Insurance Company of Korea Ltd. Assumptions and basis for the insurance liability adequacy test of Prudential Life Insurance Company of Korea Ltd. as of December 31, 2020, are as follows: Assumptions Calculation basis Lapse ratio 2~28 Ratio of canceled premiums to premiums by product group and elapsed period, based on the most recent five-year experience statistics Loss ratio 21~312 Calculated by ratio of insurance claim payments to risk premiums based on the recent five-year experience statistics Discount rate 0.85~16.27 Estimated investment yield based on the interest rate scenario provided by the Financial Supervisory Service adjusted by risk spread
Disclosure Of Results Of Insurance Liability Adequacy Test [Text Block]	KB Insurance Co., Ltd. Results of the insurance liability adequacy test of KB Insurance Co., Ltd. as of December 31, 2019 and 2020, are as follows: December 31, 2019 Recognized liabilities* Estimated adequate Shortfall (surplus) (In millions of Korean won) General insurance ￦ 365,234 ￦ 296,801 ￦ (68,433 ) Automobile insurance 1,123,450 1,071,076 (52,374 ) Long-term insurance 19,775,907 10,685,319 (9,090,588 ) ￦ 21,264,591 ￦ 12,053,196 ￦ (9,211,395 ) December 31, 2020 Recognized liabilities* Estimated adequate Shortfall (surplus) (In millions of Korean won) General insurance ￦ 461,227 ￦ 384,780 ￦ (76,447 ) Automobile insurance 1,363,104 1,279,587 (83,517 ) Long-term insurance 20,892,077 11,982,350 (8,909,727 ) ￦ 22,716,408 ￦ 13,646,717 ￦ (9,069,691 ) * Long-term insurance is for premium reserves and unearned premium reserves; the premium reserve is the amount of subtracting deferred acquisition costs and insurance contract loans from the net insurance premium reserve in accordance with Article 6-3 As a result of liability adequacy test, the Group did not set additional reserve as it shows net surplus. As such, there was no amount recorded as a result of liability adequacy test. KB Life Insurance Co., Ltd. The insurance liability adequacy test of KB Life Insurance Co., Ltd. is performed by contract types such as interest rate types and dividend types. Results of life insurance liability adequacy test as of December 31, 2019 and 2020, are as follows: December 31, 2019 Recognized liabilities Estimated adequate Shortfall (surplus) (In millions of Korean won) Fixed interest type Participating ￦ 30,514 ￦ 56,460 ￦ 25,946 Non-participating 180,058 45,166 (134,892 ) Variable interest type Participating 1,037,148 1,080,830 43,682 Non-participating 5,335,572 5,069,047 (266,525 ) Variable type (23,514 ) (133,781 ) (110,267 ) Total ￦ 6,559,778 ￦ 6,117,722 ￦ (442,056 ) December 31, 2020 Recognized liabilities Estimated adequate Shortfall (surplus) (In millions of Korean won) Fixed interest type Participating ￦ 30,447 ￦ 56,125 ￦ 25,678 Non-participating 395,766 12,952 (382,814 ) Variable interest type Participating 970,376 991,663 21,287 Non-participating 5,508,172 5,141,265 (366,907 ) Variable type (26,685 ) (124,623 ) (97,938 ) Total ￦ 6,878,076 ￦ 6,077,382 ￦ (800,694 ) As a result of liability adequacy test, the Group did not set additional reserve as it shows net surplus. As such, there was no amount recorded as a result of liability adequacy test. Prudential Life Insurance Company of Korea Ltd. The insurance liability adequacy test of Prudential Life Insurance Company of Korea Ltd. is performed by contract types such as interest rate types and dividend types. Results of life insurance liability adequacy test as of December 31, 2020, are as follows: December 31, 2020 Recognized liabilities Estimated adequate Shortfall (surplus) (In millions of Korean won) Fixed interest type Participating ￦ 75,390 ￦ 83,404 ￦ 8,014 Non-participating 11,037,531 10,534,663 (502,868 ) Variable interest type Participating — — — Non-participating 721,570 547,754 (173,816 ) Variable type 369,991 (1,220,080 ) (1,590,071 ) Total ￦ 12,204,482 ￦ 9,945,741 ￦ (2,258,741 ) As a result of liability adequacy test, the Group did not set additional reserve as it shows net surplus. As such, there was no amount recorded as a result of liability adequacy test.
Schedule of Insurance income and expenses [text block]	Details of insurance income and expenses for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Insurance Income Premium income ￦ 10,730,227 ￦ 11,173,367 ￦ 12,872,727 Reinsurance income 873,053 850,871 823,500 Reversal of policy reserves 344 993 85 Separate account income 360,664 216,429 216,485 Income from change in reinsurance assets — 42,432 467,729 Other insurance income 10,782 33,090 6,114 11,975,070 12,317,182 14,386,640 Insurance Expenses Insurance claims paid 4,415,760 5,046,772 5,264,829 Dividend expenses 9,400 9,902 11,661 Refunds of surrender value 2,855,573 2,870,543 3,286,150 Reinsurance expenses 947,560 1,018,007 1,127,304 Provision for policy reserves 1,608,519 1,547,264 2,709,903 Separate account expenses 276,412 139,810 113,703 Administration expenses 418,646 453,016 563,085 Amortization of deferred acquisition costs 606,073 679,279 767,633 Expenses from change in reinsurance assets 89,621 314 163 Claim survey expenses paid 38,782 52,123 58,873 Other insurance expenses 218,608 200,640 183,343 11,484,954 12,017,670 14,086,647 Net insurance income ￦ 490,116 ￦ 299,512 ￦ 299,993
Disclosure of exposure to nonlife insurance price risk [text block]	The Group’s exposure to insurance price risk as of December 31, 2019 and 2020, as follows: December 31, 2019 Direct insurance Reinsurance assumed Reinsurance ceded Total (In millions of Korean won) General ￦ 999,348 ￦ 101,613 ￦ (579,922 ) ￦ 521,039 Automobile 2,101,780 — (40,067 ) 2,061,713 Long-term 2,550,236 — (367,904 ) 2,182,332 ￦ 5,651,364 ￦ 101,613 ￦ (987,893 ) ￦ 4,765,084 December 31, 2020 Direct insurance Reinsurance assumed Reinsurance ceded Total (In millions of Korean won) General ￦ 1,088,791 ￦ 79,429 ￦ (663,750 ) ￦ 504,470 Automobile 2,491,412 — (21,433 ) 2,469,979 Long-term 2,803,532 — (415,439 ) 2,388,093 ￦ 6,383,735 ￦ 79,429 ￦ (1,100,622 ) ￦ 5,362,542
Schedule Of Loss Development Tables For Non-Life Insurance [Text Block]	Claims development tables The Group uses claim development of payments and the estimated ultimate claims for the years where the accident has occurred, in order to maintain overall reserve adequacy in respect of general, automobile and long-term insurance. When the estimated ultimate claims are greater than claim payments, the Group establishes additional reserves. Claims development tables as of December 31, 2019 and 2020, are as follows: <2019> General Insurance Payment year Accident year After 1 year After 2 years After 3 years After 4 years After 5 years (In millions of Korean won) Estimate of gross ultimate claims (A) 2015.1.1 ~ 2015.12.31 ￦ 125,162 ￦ 144,566 ￦ 147,031 ￦ 147,616 ￦ 148,995 2016.1.1 ~ 2016.12.31 145,618 167,818 171,205 178,265 — 2017.1.1 ~ 2017.12.31 168,409 200,704 204,538 — — 2018.1.1 ~ 2018.12.31 200,280 237,111 — — — 2019.1.1 ~ 2019.12.31 220,474 — — — — 859,943 750,199 522,774 325,881 148,995 Gross cumulative claim payments (B) 2015.1.1 ~ 2015.12.31 93,443 129,764 137,157 141,218 143,985 2016.1.1 ~ 2016.12.31 108,098 151,283 162,059 170,353 — 2017.1.1 ~ 2017.12.31 132,430 184,333 193,811 — — 2018.1.1 ~ 2018.12.31 153,770 216,705 — — — 2019.1.1 ~ 2019.12.31 185,832 — — — — 673,573 682,086 493,027 311,571 143,985 Difference (A-B) ￦ 186,369 ￦ 68,112 ￦ 29,747 ￦ 14,310 ￦ 5,010 Automobile Insurance Payment year Accident year After 1 year After 2 After 3 After 4 After 5 After 6 After 7 years (In millions of Korean won) Estimate of gross ultimate claims (A) 2013.1.1 ~ 2013.12.31 ￦ 1,131,945 ￦ 1,156,535 ￦ 1,170,968 ￦ 1,179,458 ￦ 1,179,323 ￦ 1,179,514 ￦ 1,180,458 2014.1.1 ~ 2014.12.31 1,174,611 1,193,832 1,205,524 1,212,025 1,212,162 1,214,524 — 2015.1.1 ~ 2015.12.31 1,227,106 1,245,780 1,256,058 1,263,044 1,267,142 — — 2016.1.1 ~ 2016.12.31 1,276,939 1,281,381 1,287,728 1,294,735 — — — 2017.1.1 ~ 2017.12.31 1,342,998 1,348,828 1,358,867 — — — — 2018.1.1 ~ 2018.12.31 1,468,784 1,471,807 — — — — — 2019.1.1 ~ 2019.12.31 1,591,793 — — — — — — 9,214,176 7,698,163 6,279,145 4,949,262 3,658,627 2,394,038 1,180,458 Gross cumulative claim payments (B) 2013.1.1 ~ 2013.12.31 939,569 1,114,063 1,145,110 1,161,624 1,168,617 1,175,681 1,178,158 2014.1.1 ~ 2014.12.31 969,211 1,150,462 1,180,953 1,196,387 1,204,580 1,208,421 — 2015.1.1 ~ 2015.12.31 1,020,975 1,198,241 1,228,357 1,245,779 1,254,187 — — 2016.1.1 ~ 2016.12.31 1,052,830 1,235,656 1,264,651 1,282,346 — — — 2017.1.1 ~ 2017.12.31 1,104,158 1,306,235 1,335,962 — — — — 2018.1.1 ~ 2018.12.31 1,224,820 1,428,973 — — — — — 2019.1.1 ~ 2019.12.31 1,332,849 — — — — — — 7,644,412 7,433,630 6,155,033 4,886,136 3,627,384 2,384,102 1,178,158 Difference (A-B) ￦ 1,569,764 ￦ 264,533 ￦ 124,112 ￦ 63,126 ￦ 31,243 ￦ 9,936 ￦ 2,300 Long-term Insurance Payment year Accident year After 1 year After 2 After 3 After 4 After 5 After 6 After 7 (In millions of Korean won) Estimate of gross ultimate claims (A) 2013.1.1 ~ 2013.12.31 ￦ 709,602 ￦ 965,587 ￦ 997,607 ￦ 1,003,646 ￦ 1,006,025 ￦ 1,007,041 ￦ 1,008,589 2014.1.1 ~ 2014.12.31 789,087 1,083,048 1,114,821 1,119,206 1,122,192 1,123,240 — 2015.1.1 ~ 2015.12.31 885,476 1,219,393 1,256,051 1,266,881 1,270,967 — — 2016.1.1 ~ 2016.12.31 1,064,744 1,437,573 1,485,839 1,500,403 — — — 2017.1.1 ~ 2017.12.31 1,184,224 1,614,903 1,670,929 — — — — 2018.1.1 ~ 2018.12.31 1,372,706 1,881,046 — — — — — 2019.1.1 ~ 2019.12.31 1,626,481 — — — — — — 7,632,320 8,201,550 6,525,247 4,890,136 3,399,184 2,130,281 1,008,589 Gross cumulative claim payments (B) 2013.1.1 ~ 2013.12.31 671,500 953,494 989,957 999,944 1,003,715 1,005,796 1,007,865 2014.1.1 ~ 2014.12.31 744,944 1,065,792 1,104,468 1,114,341 1,119,531 1,122,378 — 2015.1.1 ~ 2015.12.31 836,471 1,205,130 1,248,475 1,262,528 1,269,557 — — 2016.1.1 ~ 2016.12.31 1,017,243 1,424,948 1,477,415 1,496,556 — — — 2017.1.1 ~ 2017.12.31 1,130,868 1,599,227 1,662,978 — — — — 2018.1.1 ~ 2018.12.31 1,319,613 1,868,434 — — — — — 2019.1.1 ~ 2019.12.31 1,574,696 — — — — — — 7,295,335 8,117,025 6,483,293 4,873,369 3,392,803 2,128,174 1,007,865 Difference (A-B) ￦ 336,985 ￦ 84,525 ￦ 41,954 ￦ 16,767 ￦ 6,381 ￦ 2,107 ￦ 724 <2020> General Insurance Payment year Accident year After 1 year After 2 years After 3 years After 4 years After 5 years (In millions of Korean won) Estimate of gross ultimate claims (A) 2016.1.1 ~ 2016.12.31 ￦ 145,618 ￦ 167,818 ￦ 171,206 ￦ 178,265 ￦ 180,160 2017.1.1 ~ 2017.12.31 168,409 200,699 204,368 206,201 — 2018.1.1 ~ 2018.12.31 200,968 241,474 246,871 — — 2019.1.1 ~ 2019.12.31 219,881 263,849 — — — 2020.1.1 ~ 2020.12.31 232,622 — — — — 967,498 873,840 622,445 384,466 180,160 Gross cumulative claim payments (B) 2016.1.1 ~ 2016.12.31 108,098 151,282 162,059 170,353 175,063 2017.1.1 ~ 2017.12.31 132,430 184,333 193,780 199,225 — 2018.1.1 ~ 2018.12.31 153,770 217,955 235,900 — — 2019.1.1 ~ 2019.12.31 185,645 246,397 — — — 2020.1.1 ~ 2020.12.31 167,129 — — — — 747,072 799,967 591,739 369,578 175,063 Difference (A-B) ￦ 220,426 ￦ 73,873 ￦ 30,706 ￦ 14,888 ￦ 5,097 Automobile Insurance Payment year Accident year After 1 year After 2 After 3 After 4 After 5 After 6 After 7 (In millions of Korean won) Estimate of gross ultimate claims (A) 2014.1.1 ~ 2014.12.31 ￦ 1,174,611 ￦ 1,193,833 ￦ 1,205,524 ￦ 1,212,025 ￦ 1,212,162 ￦ 1,214,524 ￦ 1,217,006 2015.1.1 ~ 2015.12.31 1,227,106 1,245,780 1,256,058 1,263,044 1,267,142 1,271,001 — 2016.1.1 ~ 2016.12.31 1,276,939 1,281,381 1,287,728 1,294,735 1,299,964 — — 2017.1.1 ~ 2017.12.31 1,342,998 1,348,828 1,358,867 1,368,016 — — — 2018.1.1 ~ 2018.12.31 1,468,784 1,471,807 1,481,509 — — — — 2019.1.1 ~ 2019.12.31 1,591,793 1,620,609 — — — — — 2020.1.1 ~ 2020.12.31 1,624,341 — — — — — — 9,706,572 8,162,238 6,589,686 5,137,820 3,779,268 2,485,525 1,217,006 Gross cumulative claim payments (B) 2014.1.1 ~ 2014.12.31 969,211 1,150,462 1,180,953 1,196,387 1,204,580 1,208,421 1,210,632 2015.1.1 ~ 2015.12.31 1,020,975 1,198,241 1,228,357 1,245,779 1,254,187 1,261,995 — 2016.1.1 ~ 2016.12.31 1,052,830 1,235,656 1,264,651 1,282,346 1,288,754 — — 2017.1.1 ~ 2017.12.31 1,104,158 1,306,235 1,335,962 1,350,174 — — — 2018.1.1 ~ 2018.12.31 1,224,820 1,428,973 1,456,532 — — — — 2019.1.1 ~ 2019.12.31 1,332,849 1,570,194 — — — — — 2020.1.1 ~ 2020.12.31 1,353,799 — — — — — — 8,058,642 7,889,761 6,466,455 5,074,686 3,747,521 2,470,416 1,210,632 Difference (A-B) ￦ 1,647,930 ￦ 272,477 ￦ 123,231 ￦ 63,134 ￦ 31,747 ￦ 15,109 ￦ 6,374 Long-term Insurance Payment year Accident year After 1 After 2 After 3 After 4 After 5 After 6 After 7 (In millions of Korean won) Estimate of gross ultimate claims (A) 2014.1.1 ~ 2014.12.31 ￦ 789,088 ￦ 1,083,049 ￦ 1,114,820 ￦ 1,119,206 ￦ 1,122,191 ￦ 1,123,240 ￦ 1,124,628 2015.1.1 ~ 2015.12.31 885,476 1,219,394 1,256,051 1,266,881 1,270,967 1,273,615 — 2016.1.1 ~ 2016.12.31 1,064,744 1,437,573 1,485,839 1,500,403 1,506,889 — — 2017.1.1 ~ 2017.12.31 1,184,224 1,614,903 1,670,929 1,689,768 — — — 2018.1.1 ~ 2018.12.31 1,372,706 1,881,046 1,941,497 — — — — 2019.1.1 ~ 2019.12.31 1,626,481 2,229,830 — — — — — 2020.1.1 ~ 2020.12.31 1,818,316 — — — — — — 8,741,035 9,465,795 7,469,136 5,576,258 3,900,047 2,396,855 1,124,628 Gross cumulative claim payments (B) 2014.1.1 ~ 2014.12.31 744,944 1,065,792 1,104,468 1,114,341 1,119,531 1,122,378 1,123,868 2015.1.1 ~ 2015.12.31 836,471 1,205,130 1,248,475 1,262,528 1,269,557 1,272,648 — 2016.1.1 ~ 2016.12.31 1,017,243 1,424,948 1,477,415 1,496,556 1,503,841 — — 2017.1.1 ~ 2017.12.31 1,130,868 1,599,227 1,662,978 1,683,997 — — — 2018.1.1 ~ 2018.12.31 1,319,613 1,868,434 1,933,543 — — — — 2019.1.1 ~ 2019.12.31 1,574,696 2,211,717 — — — — — 2020.1.1 ~ 2020.12.31 1,749,647 — — — — — — 8,373,482 9,375,248 7,426,879 5,557,422 3,892,929 2,395,026 1,123,868 Difference (A-B) ￦ 367,553 ￦ 90,547 ￦ 42,257 ￦ 18,836 ￦ 7,118 ￦ 1,829 ￦ 760
Disclosure of sensitivity to insurance risk [text block]	KB Insurance Co., Ltd. The Group manages insurance risk by performing sensitivity analysis based on discount rate, loss ratio and expense ratio which are considered to have significant influence on future cash flow, timing and uncertainty. According to result of sensitivity analysis there is no material influence on the equity and net profit before tax. December 31, 2019 Assumption Change Effect on LAT Insurance liabilities Profit before tax Equity (In millions of Korean won) Lapse ratio +10 % ￦ 495,287 ￦ — ￦ — ￦ — -10 % (553,013 ) — — — Loss ratio +10 % 4,576,415 — — — -10 % (4,576,415 ) — — — Expense ratio +10 % 342,587 — — — -10 % (342,587 ) — — — Discount rate +0.5 %p (1,521,385 ) — — — -0.5 %p 1,800,472 — — — December 31, 2020 Assumption change Effect on LAT Insurance liabilities Profit before tax Equity (In millions of Korean won) Lapse ratio +10 % ￦ 568,734 ￦ — ￦ — ￦ — -10 % (633,788 ) — — — Loss ratio +10 % 5,012,443 — — — -10 % (5,012,443 ) — — — Expense ratio +10 % 345,752 — — — -10 % (345,752 ) — — — Discount rate +0.5 %p (1,499,565 ) — — — -0.5 %p 1,726,707 — — — KB Life Insurance Co., Ltd. December 31, 2019 Assumption change Effect on LAT Insurance liabilities Profit before tax Equity (In millions of Korean won) Lapse ratio +10 % ￦ 47,615 ￦ — ￦ — ￦ — -10 % (52,877 ) — — — Claim ratio +10 % 22,675 — — — -10 % (23,308 ) — — — Expense ratio +10 % 32,068 — — — -10 % (32,068 ) — — — Discount rate +0.5 %p (388,848 ) — — — -0.5 %p 441,585 — — — December 31, 2020 Assumption change Effect on LAT Insurance liabilities Profit before tax Equity (In millions of Korean won) Lapse ratio +10 % ￦ 68,714 ￦ — ￦ — ￦ — -10 % (76,265 ) — — — Claim ratio +10 % 30,594 — — — -10 % (31,600 ) — — — Expense ratio +10 % 33,020 — — — -10 % (33,020 ) — — — Discount rate +0.5 %p (424,309 ) — — — -0.5 %p 477,556 — — — Prudential Life Insurance Company of Korea Ltd. December 31, 2020 Assumption change Effect on LAT Insurance liabilities Profit before tax Equity (In millions of Korean won) Lapse ratio +10 % ￦ 167,536 ￦ — ￦ — ￦ — -10 % (182,654 ) — — — Claim ratio +10 % 644,798 — — — -10 % (665,990 ) — — — Expense ratio +10 % 135,587 — — — -10 % (135,587 ) — — — Discount rate +0.5 %p (1,245,727 ) — — — -0.5 %p 1,426,726 — — —
Schedule of maturity structure of premium reserve related to liquidity risk [text block]	KB Insurance Co., Ltd. Premium reserve’s maturity structure as of December 31, 2019 and 2020, as follows: December 31, 2019* Up to 1 year 1~5 years 5~10 Years 10~20 years Over 20 years Total (In millions of Korean won) Long-term insurance non-participating Fixed interest type ￦ 57,532 ￦ 258,436 ￦ 84,349 ￦ 43,141 ￦ 125,622 ￦ 569,080 Variable interest type 527,467 2,578,004 2,085,054 777,340 13,336,668 19,304,533 584,999 2,836,440 2,169,403 820,481 13,462,290 19,873,613 Annuity Fixed interest type 10 543 2,244 3,714 1,075 7,586 Variable interest type 273 70,180 367,710 1,245,176 2,227,054 3,910,393 283 70,723 369,954 1,248,890 2,228,129 3,917,979 Asset-linked Variable interest type 27,389 — — — — 27,389 Total Fixed interest type 57,542 258,979 86,593 46,855 126,697 576,666 Variable interest type 555,129 2,648,184 2,452,764 2,022,516 15,563,722 23,242,315 ￦ 612,671 ￦ 2,907,163 ￦ 2,539,357 ￦ 2,069,371 ￦ 15,690,419 ￦ 23,818,981 December 31, 2020* Up to 1 year 1~5 years 5~10 years 10~20 years Over 20 years Total (In millions of Korean won) Long-term insurance non-participating Fixed interest type ￦ 70,782 ￦ 191,570 ￦ 78,092 ￦ 51,216 ￦ 175,387 ￦ 567,047 Variable interest type 663,210 2,304,298 1,937,621 845,404 14,716,753 20,467,286 733,992 2,495,868 2,015,713 896,620 14,892,140 21,034,333 Annuity Fixed interest type 5 717 2,203 3,817 738 7,480 Variable interest type 242 83,568 390,516 1,301,383 2,195,244 3,970,953 247 84,285 392,719 1,305,200 2,195,982 3,978,433 Asset-linked Variable interest type — — — — — — Total Fixed interest type 70,787 192,287 80,295 55,033 176,125 574,527 Variable interest type 663,452 2,387,866 2,328,137 2,146,787 16,911,997 24,438,239 ￦ 734,239 ￦ 2,580,153 ￦ 2,408,432 ￦ 2,201,820 ￦ 17,088,122 ￦ 25,012,766 * Includes long-term investment contract amounting to ￦ 108,938 million and ￦ 106,853 million, as of December 31, 2019 and 2020, respectively. KB Life Insurance Co., Ltd. December 31, 2019 Up to 3 years 3-5 5-10 years 10-15 15-20 Over 20 years Total (In millions of Korean won) Premium reserve ￦ 984,945 ￦ 280,733 ￦ 665,241 ￦ 525,699 ￦ 345,664 ￦ 4,188,965 ￦ 6,991,247 December 31, 2020 Up to 3 years 3-5 5-10 10-15 15-20 Over 20 years Total (In millions of Korean won) Premium reserve ￦ 739,485 ￦ 350,639 ￦ 605,931 ￦ 412,563 ￦ 451,074 ￦ 4,770,046 ￦ 7,329,738 Prudential Life Insurance Company of Korea Ltd. December 31, 2020 Up to 3 years 3-5 5-10 years 10-15 15-20 Over Total (In millions of Korean won) Premium reserve ￦ 48,807 ￦ 37,502 ￦ 139,973 ￦ 215,470 ￦ 418,684 ￦ 12,376,772 ￦ 13,237,208
Disclosure of credit risk of insurance contracts [Text Block]	KB Insurance Co., Ltd. As of December 31, 2020, there are 168 reinsurance companies that deal with the Group, and the top three reinsurance companies’ concentration and credit ratings are as follows: Reinsurance company Ratio Credit rating KOREAN RE 48.02 % AA MUNICH RE 3.94 % AAA ALLIANZGLOBAL 3.85 % AAA Exposures to credit risk related to reinsurance as of December 31, 2019 and 2020 as follows: December 31, December 31, (In millions of Korean won) Reinsurance assets 1 ￦ 735,196 ￦ 1,199,354 Receivables from reinsurers 2 328,177 252,064 ￦ 1,063,373 ￦ 1,451,418 1 Net carrying amounts after impairment loss 2 Net carrying amounts after allowance for credit losses
Disclosure of exposure to interest rate risk of insurance contract [text block]	KB Insurance Co., Ltd. The interest rate risk exposure from the Group’s insurance contracts is the risk of unexpected losses in net interest income or net assets arising from changes in interest rates and it is managed to minimize unexpected loss. For long-term, non-life Exposure to interest rate risk December 31, 2019 December 31, 2020 (In millions of Korean won) Interest bearing liabilities Fixed interest rate type ￦ 534,236 ￦ 501,147 Variable interest rate type 21,911,393 23,213,667 ￦ 22,445,629 ￦ 23,714,814 Interest bearing assets Due from financial institutions measured at amortized cost and cash equivalents ￦ 108,559 ￦ 160,249 Financial assets at fair value through profit or loss 4,560,512 3,823,603 Financial assets at fair value through other comprehensive income 2,984,738 3,983,567 Securities measured at amortized cost 8,163,485 8,700,196 Loans measured at amortized cost 6,924,597 6,271,484 ￦ 22,741,891 ￦ 22,939,099
Disclosure of maximum exposures to life insurance price risk [text block]	KB Life Insurance Co., Ltd. Maximum exposures to insurance price risk as of December 31, 2019 and 2020, are as follows: December 31, 2019 Before reinsurance After reinsurance (In millions of Korean won) Death ￦ 12,882 ￦ 9,033 Disability 754 424 Hospitalization 1,260 642 Operation and diagnosis 4,419 2,211 Actual medical expense 1,053 396 Others 1,066 411 ￦ 21,434 ￦ 13,117 December 31, 2020 Before reinsurance After reinsurance (In millions of Korean won) Death ￦ 13,509 ￦ 10,409 Disability 672 349 Hospitalization 1,213 787 Operation and diagnosis 4,809 1,783 Actual medical expense 1,095 23 Others 1,045 474 ￦ 22,343 ￦ 13,825 Prudential Life Insurance Company of Korea Ltd. Maximum exposures to insurance price risk as of December 31, 2020, are as follows: December 31, 2020 Before reinsurance After reinsurance (In millions of Korean won) Death ￦ 244,975 ￦ 240,121 Disability 10,485 9,964 Hospitalization 33,321 33,321 Operation and diagnosis 77,820 76,530 ￦ 366,601 ￦ 359,936
Disclosure of exposure of market risk arising from embedded derivatives included in host insurance contracts [text block]	KB Life Insurance Co., Ltd. Exposure of market risk arising from embedded derivatives included in host insurance contracts as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 Policyholders’ reserve* Guarantee Policyholders’ reserve* Guarantee (In millions of Korean won) Variable annuity ￦ 429,970 ￦ 2,565 ￦ 490,551 ￦ 2,782 Variable universal 91,988 3,095 90,337 2,515 Variable saving 734,661 516 720,197 504 ￦ 1,256,619 ￦ 6,176 ￦ 1,301,085 ￦ 5,801 * Excludes the amount of the lapsed reserve. Prudential Life Insurance Company of Korea Ltd. Exposures of market risk arising from embedded derivatives included in host insurance contracts as of December 31, 2020, are as follows: December 31, 2020 Policyholders’ reserve* Guarantee reserve (In millions of Korean won) Variable whole life ￦ 241,955 ￦ 112,620 Variable annuity 2,487,715 30,306 Variable universal (protection) 1,544,241 718,783 Variable universal (savings) 446,686 448 ￦ 4,720,597 ￦ 862,157 * Excludes the amount of the lapsed reserve.
Schedule of premium reserves and unearned premium reserves classified based on each residual maturity [text block]	KB Life Insurance Co., Ltd. Maturity structure of premium reserve as of December 31, 2019 and 2020, as follows: December 31, 2019 Up to 3 years 3-5 5-10 years 10-15 15-20 Over 20 years Total (In millions of Korean won) Premium reserve ￦ 984,945 ￦ 280,733 ￦ 665,241 ￦ 525,699 ￦ 345,664 ￦ 4,188,965 ￦ 6,991,247 December 31, 2020 Up to 3 years 3-5 5-10 10-15 15-20 Over 20 years Total (In millions of Korean won) Premium reserve ￦ 739,485 ￦ 350,639 ￦ 605,931 ￦ 412,563 ￦ 451,074 ￦ 4,770,046 ￦ 7,329,738 Prudential Life Insurance Company of Korea Ltd. December 31, 2020 Up to 3 years 3-5 5-10 years 10-15 15-20 Over Total (In millions of Korean won) Premium reserve ￦ 48,807 ￦ 37,502 ￦ 139,973 ￦ 215,470 ￦ 418,684 ￦ 12,376,772 ￦ 13,237,208
Disclosure of financial assets to which overlay approach is applied [Text Block]	Details of financial assets with the overlay approach applied as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Financial assets at fair value through profit or loss Due from financial institutions ￦ 166,891 ￦ 70,312 Debt securities 7,955,286 7,363,457 Equity securities 52,250 305,337 ￦ 8,174,427 ￦ 7,739,106
Disclosure Of Changes Of Net Gains (Losses) On Overlay Adjustment [Text Block]	Changes in net gains (losses) on overlay adjustment for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 (In millions of Korean won) Beginning ￦ (7,146 ) ￦ 187,077 Recognition of other comprehensive income due to acquisition and valuation 196,110 177,500 Reclassification to profit or loss due to disposal (1,887 ) (25,375 ) Ending ￦ 187,077 ￦ 339,202

Statement of Cash Flows(Table)

Statement of Cash Flows(Table)	12 Months Ended
	Dec. 31, 2020
Statement Of Cash Flows Abstract [Abstract]
Disclosure Of Cash And Cash Equivalents Explanatory	Details of cash and cash equivalents as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Cash ￦ 2,311,418 ￦ 2,560,970 Checks with other banks 383,500 327,781 Due from the Bank of Korea 8,607,911 12,340,532 Due from other financial institutions 9,535,049 10,379,559 20,837,878 25,608,842 Due from financial institutions measured at fair value through profit or loss 216,367 100,094 21,054,245 25,708,936 Restricted due from financial institutions (13,372,966 ) (15,303,363 ) Due from financial institutions with original maturities over three months (1,557,554 ) (1,720,481 ) (14,930,520 ) (17,023,844 ) ￦ 6,123,725 ￦ 8,685,092
Schedule Of Other Significant Noncash Transactions Text Block [Text Block]	Significant non-cash 2018 2019 2020 (In millions of Korean won) Decrease in loans due to write-offs ￦ 1,079,435 ￦ 1,188,584 ￦ 1,283,071 Changes in financial investments due to debt-for-equity 22,286 104,815 13,820 Changes in accumulated other comprehensive income from valuation of financial instruments at fair value through other comprehensive income 119,182 35,490 496,159 Changes in accumulated other comprehensive income from valuation of investments in associates (3,733 ) 7,695 (6,978 ) Changes in other payables due to treasury stock trust agreement, etc. 6,678 — —
Schedule Of Cash Flow Supplemental Disclosures Table Text Block [Text Block]	Cash inflows and outflows from income tax, interests and dividends for the years ended December 31, 2018, 2019 and 2020, are as follows: Activity 2018 2019 2020 (In millions of Korean won) Income tax paid Operating ￦ 759,013 ￦ 1,223,084 ￦ 1,119,252 Interest received Operating 13,958,806 14,936,705 14,986,532 Interest paid Operating 4,369,345 5,365,595 5,266,158 Dividends received Operating 235,243 185,846 187,699 Dividends paid Financing 766,728 766,249 883,952
Disclosure of reconciliation of liabilities arising from financing activities [text block]	Changes in liabilities arising from financing activities for the years ended December 31, 2019 and 2020, are as follows: 2019 Non-cash Beginning Net cash Acquisition Exchange Changes in fair value Subsidiaries Others Ending (In millions of Korean won) Derivatives held for hedging* ￦ 8,049 ￦ (28,631 ) ￦ — ￦ — ￦ 139,771 ￦ — ￦ 67,912 ￦ 187,101 Borrowings 86,283,531 2,537,391 — 397,571 67,297 (602,388 ) 71,041 88,754,443 Due to trust accounts 5,285,108 (68,648 ) — — — — — 5,216,460 Changes in non-controlling 9,110 574,580 — 345 — — 1,372 585,407 Others 167,128 (95,723 ) 766,259 35,591 — — (4,699 ) 868,556 ￦ 91,752,926 ￦ 2,918,969 ￦ 766,259 ￦ 433,507 ￦ 207,068 ￦ (602,388 ) ￦ 135,626 ￦ 95,611,967 2020 Non-cash Beginning Net cash Acquisition Exchange Changes in fair value Subsidiaries Others Ending (In millions of Korean won) Derivatives held for hedging* ￦ 187,101 ￦ (16,202 ) ￦ — ￦ (102,347 ) ￦ 10,553 ￦ 1,166 ￦ (137,467 ) ￦ (57,196 ) Borrowings 88,754,443 22,627,875 — (217,461 ) (591,619 ) 2,131,517 (116,912 ) 112,587,843 Due to trust accounts 5,216,460 2,326,495 — — — — — 7,542,955 Changes in non-controlling 585,407 (25,658 ) — 250,904 — — 47,130 857,783 Others 868,556 (63,065 ) 236,860 11 — — (23,287 ) 1,019,075 ￦ 95,611,967 ￦ 24,849,445 ￦ 236,860 ￦ (68,893 ) ￦ (581,066 ) ￦ 2,132,683 ￦ (230,536 ) ￦ 121,950,460 * Derivatives held for hedging purposes are the net amount after offsetting liabilities from assets.

Contingent Liabilities And Co_2

Contingent Liabilities And Commitments(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Contingent Liabilities Abstract [Abstract]
Schedule Of Guarantee Obligations Text Block [Text Block]	Details of acceptances and guarantees as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Confirmed acceptances and guarantees Confirmed acceptances and guarantees in Korean won Acceptances and guarantees for KB purchasing loan ￦ 161,314 ￦ 144,457 Others 746,823 1,048,848 908,137 1,193,305 Confirmed acceptances and guarantees in foreign currencies Acceptances of letter of credit 155,151 221,422 Letter of guarantees 49,754 45,693 Bid bond 37,765 72,037 Performance bond 718,097 703,826 Refund guarantees 1,022,646 801,445 Others 2,935,939 3,072,099 4,919,352 4,916,522 Financial guarantees Acceptances and guarantees for issuance of debenture — 10,040 Acceptances and guarantees for mortgage 47,384 89,302 Overseas debt guarantees 406,680 410,470 International financing guarantees in foreign currencies 231,685 197,097 Others 230,000 50,950 915,749 757,859 6,743,238 6,867,686 Unconfirmed acceptances and guarantees Guarantees of letter of credit 1,845,508 2,094,989 Refund guarantees 654,497 344,112 2,500,005 2,439,101 ￦ 9,243,243 ￦ 9,306,787
Disclosure Of Credit Risk Exposure Of Payment Gurantees Explanatory Text Block [Text Block]	Credit qualities of acceptances and guarantees exposure as of December 31, 2019 and 2020, are as follows: December 31, 2019 12-month Lifetime expected credit Total Non-impaired Impaired (In millions of Korean won) Confirmed acceptances and guarantees Grade 1 ￦ 4,220,046 ￦ 696 ￦ — ￦ 4,220,742 Grade 2 2,105,637 38,271 — 2,143,908 Grade 3 93,074 81,317 — 174,391 Grade 4 18,773 172,440 — 191,213 Grade 5 — 2,873 10,111 12,984 6,437,530 295,597 10,111 6,743,238 Unconfirmed acceptances and guarantees Grade 1 1,228,258 1,289 — 1,229,547 Grade 2 1,121,159 32,413 — 1,153,572 Grade 3 17,091 20,957 — 38,048 Grade 4 4,236 62,964 — 67,200 Grade 5 — 170 11,468 11,638 2,370,744 117,793 11,468 2,500,005 ￦ 8,808,274 ￦ 413,390 ￦ 21,579 ￦ 9,243,243 December 31, 2020 12-month Lifetime expected credit Total Non-impaired Impaired (In millions of Korean won) Confirmed acceptances and guarantees Grade 1 ￦ 4,377,798 ￦ 1,119 ￦ — ￦ 4,378,917 Grade 2 2,269,455 47,438 — 2,316,893 Grade 3 27,588 85,321 — 112,909 Grade 4 14,925 33,440 501 48,866 Grade 5 — 453 9,648 10,101 6,689,766 167,771 10,149 6,867,686 Unconfirmed acceptances and guarantees Grade 1 1,422,528 771 — 1,423,299 Grade 2 912,209 28,506 — 940,715 Grade 3 11,399 23,069 — 34,468 Grade 4 2,369 29,934 — 32,303 Grade 5 — 589 7,727 8,316 2,348,505 82,869 7,727 2,439,101 ￦ 9,038,271 ￦ 250,640 ￦ 17,876 ￦ 9,306,787
Schedule Of Acceptance And Guarantees By Counterparty Table Text Block [Text Block]	Acceptances and guarantees by counterparty as of December 31, 2019 and 2020, are as follows: December 31, 2019 Confirmed Unconfirmed Total Proportion (In millions of Korean won) Large companies ￦ 5,962,004 ￦ 1,904,346 ￦ 7,866,350 85.10 Small and medium-sized 650,612 397,539 1,048,151 11.34 Public sector and others 130,622 198,120 328,742 3.56 ￦ 6,743,238 ￦ 2,500,005 ￦ 9,243,243 100.00 December 31, 2020 Confirmed Unconfirmed Total Proportion (In millions of Korean won) Large companies ￦ 5,538,003 ￦ 1,770,235 ￦ 7,308,238 78.53 Small and medium-sized 695,860 459,487 1,155,347 12.41 Public sector and others 633,823 209,379 843,202 9.06 ￦ 6,867,686 ￦ 2,439,101 ￦ 9,306,787 100.00
Schedule Of Acceptance And Guarantees By Industry Table Text Block [Text Block]	Acceptances and guarantees by industry as of December 31, 2019 and 2020, are as follows: December 31, 2019 Confirmed Unconfirmed Total Proportion (In millions of Korean won) Financial institutions ￦ 260,974 ￦ 23,999 ￦ 284,973 3.08 Manufacturing 3,373,220 1,627,840 5,001,060 54.11 Service 1,187,516 88,158 1,275,674 13.80 Wholesale and retail 1,126,976 597,998 1,724,974 18.66 Construction 467,114 20,590 487,704 5.28 Public sector 107,481 81,895 189,376 2.05 Others 219,957 59,525 279,482 3.02 ￦ 6,743,238 ￦ 2,500,005 ￦ 9,243,243 100.00 December 31, 2020 Confirmed Unconfirmed Total Proportion (In millions of Korean won) Financial institutions ￦ 632,947 ￦ 5,871 ￦ 638,818 6.86 Manufacturing 2,992,319 1,285,530 4,277,849 45.96 Service 920,352 89,457 1,009,809 10.85 Wholesale and retail 1,086,772 891,619 1,978,391 21.26 Construction 411,601 14,488 426,089 4.58 Public sector 104,925 103,285 208,210 2.24 Others 718,770 48,851 767,621 8.25 ￦ 6,867,686 ￦ 2,439,101 ￦ 9,306,787 100.00
Disclosure Of Commitments Explanatory	Details of commitments as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Commitments Corporate loan commitments ￦ 41,930,407 ￦ 40,253,100 Retail loan commitments 42,582,736 46,450,857 Credit line of credit cards 60,667,219 65,325,863 Purchase of other securities 6,617,253 7,104,163 151,797,615 159,133,983 Financial Guarantees Credit line 2,340,141 3,522,809 Purchase of securities 591,500 683,800 2,931,641 4,206,609 ￦ 154,729,256 ￦ 163,340,592
Details Of Major Pending Lawsuits [TextBlock]	a) The Group has 122 pending lawsuits as a plaintiff (excluding simple lawsuits related to the collection or management of loans), with an aggregate claims of ￦ 396,881 million, and 275 pending lawsuits as a defendant (excluding simple lawsuits related to the collection or management of loans) with an aggregate claims of ￦ 2,009,603 million, which arose in the normal course of the business, as of December 31, 2020. Details of major pending lawsuits in which the Group is a defendant are as follows: (in number of cases, in millions of Korean won) Company Lawsuits No. of Amount Description of the lawsuits Status of the lawsuits Kookmin Bank Request for a return of redemption amount 1 ￦ 48,068 Kookmin Bank invested the assets entrusted by OO Asset Management and OO Investment Trust Management in the Fairfield Sentry Limited, and Fairfield Sentry Limited reinvested the assets in Bernard L. Madoff Investment Securities LLC managed by Bernard Madoff (Bernard L. Madoff Investment Securities LLC is in the liquidation process due to Ponzi scheme fraud-related losses). Bankruptcy trustee of Bernard L. Madoff Investment Securities LLC filed a lawsuit against Kookmin Bank seeking to return the amount of redemptions received by Kookmin Bank through Fairfield Sentry Limited. Application for incineration by the defendant has been denied, and further proceedings are scheduled. [Related litigation is in progress at the New York Southern District Bankruptcy Court (10-03777) Kookmin Bank Request for compensation for damages 1 1,629,557 The plaintiff filed a lawsuit for compensation for damages against Indonesian Financial Supervisory Authority (OJK) and Kookmin Bank as joint defendants, claiming that the capital increase and Kookmin Bank’s acquisition of PT Bank Bukopin TBK was illegal in violation of local laws and regulations in Indonesia. It is difficult to accurately predict the result of the lawsuit as of now because the complaint has not been received, but it is judged that the possibility that the result of this lawsuit will have a significant impact on the financial position of Kookmin Bank is low. KB Securities Co., Ltd. Request for a return of transaction amount (Australian fund) 1 100,000 The plaintiffs OOOO Securities and OOOO Life Insurance filed lawsuits, claiming that the KB Securities Co., Ltd. provided false information on major matters in the product description while selling JB Australia NDIS Private Fund No.1 (on April 25, 2019, plaintiffs invested ￦ 50 billion each) (a) (Primary claim) requesting KB Securities Co., Ltd. to return unjust enrichment of ￦ 100 billion for cancelation of sales contracts of beneficiary certificates due to an error or termination of the contract due to default, (b) (Secondary claim) requesting for compensation for damages in investments amounting to ￦ 100 billion due to violation of the investor protection obligation and fraudulent transactions of KB Securities Co., Ltd. and OOO Asset Management. First trial is in progress (second hearing for the first trial is scheduled on April 2, 2021). b) On April 10, 2020, Kookmin Bank acquired 70% shares of PRASAC Microfinance Institution Plc. (“PRASAC”), a specialized credit micro finance institution in Cambodia, for US$ 603 million from its existing shareholders. Kookmin Bank has signed an agreement with the existing shareholders of PRASAC. The existing shareholders have the right of put option to sell 30% of the remaining shares to Kookmin Bank, and they are entitled to exercise their rights at the exercise price calculated on the basis of the adjusted book value of net asset as of 2021 year-end, c) Kookmin Bank has entered into an agreement with PT Bosowa Corporindo, a major shareholder of PT Bank Bukopin TBK. Under this agreement, Kookmin Bank and PT Bosowa Corporindo have a right of first refusal and a tag-along d) In June 2013, KB Kookmin Card Co., Ltd. had an accident in which cardholders’ personal information was stolen (hereinafter referred to as “accident”) due to illegal activities by employees of personal credit information company in charge of development of the system upgrading to prevent fraudulent use of credit card. As a result, KB Kookmin Card Co., Ltd. was notified by the Financial Services Commission of the suspension of some new business for 3 months as of February 16, 2014. In respect of the incident, the Group faces 11 and 2 legal claims filed as a defendant, with an aggregate claim of ￦ 444 million and ￦ 108 million as of December 31, 2019 and 2020 and a provision for these lawsuits amounting ￦ 2,549 million was recognized as of December 31, 2019. In addition, the Group takes out the personal information protection liability insurance as of December 31, 2020. e) As of December 31, 2020, the Group is not able to dispose, transfer or collateralize the shares or rights of shares of KB KOLAO Leasing Co., LTD. (“joint-venture lease company”) to a third party without the written consent of both KB Kookmin Card Co., Ltd. and Kolao Holdings, for five years (the restriction period for the disposal of its equity) after the date of initial investment for KB KOLAO LEASING CO., LTD. However, KB Kookmin Card Co., Ltd. and KB Capital Co., Ltd. may transfer all or part of their shares in the joint-venture lease company to affiliates who agree to comply with all the terms and conditions of this agreement on the establishment and operation of the joint-venture lease company in Laos and agree to succeed their responsibility for the joint-venture lease company. After the expiration of the restriction period for the disposal, as prescribed separately, each party of the joint-venture lease company may transfer all or part of their shares. Meanwhile, KB KOLAO Leasing Co., LTD. is selling LVMC Holdings (formerly Kolao Holdings) allied receivables that are more than three months overdue to Lanexang Leasing Co., Ltd. in accordance with an agreement. f) As of December 31, 2020, KB Capital Co., Ltd. and PT Sunindo Primasura are required to hold the shares of PT Sunindo Kookmin Best Finance for five years after the completion of the share purchase. If one party is going to sell all or part of the shares, provide them as collateral, trade or dispose of them, it should give the opportunity to exercise preemption to the other party by providing written proposal including transfer price, payment method and others. Meanwhile, the shareholders of PT Sunindo Kookmin Best Finance can receive dividends for up to 20% of net profit after taxes for each fiscal year starting from the fiscal year ended December 31, 2023. g) KB Securities Co., Ltd., as a sales agency, sold ￦ 326,500 million of private equity funds and trusts, which loans to corporations (borrower) that invest in apartment rental businesses for the disabled in Australia, to individuals and institutional investors. However, management of the fund is impossible due to the breach of contract by local borrower in Australia, therefore there is a possibility of losses of principal to these funds subscribers. In this regard, there are three lawsuits in which the Group is the defendant as of December 31, 2020. There is a possibility that additional lawsuits will be filed in the future, but the magnitude and final outcome of the lawsuit are unpredictable. h) In relation to Lime Asset Management, KB Securities Co., Ltd. has a PIS (Portfolio Index Swap) contract, as of December 31, 2020, associated with ‘Lime Thetis Qualified Investor Private Investment Trust No.2’ and Lime Pluto FI Qualified Investor Private Investment Trust No.D-1’ i) The proliferation of COVID-19 • There is a possibility of uncertainty about the credit risk of a borrower that could be affected by COVID-19. • Uncertainty may arise about forward-looking macroeconomic information related to expected credit losses. • Korean won may depreciate against major foreign currencies. This may result in an increase in principal and interest payments on liabilities denominated in foreign currencies, and losses on foreign exchanges transactions. • A significant decrease in the fair value of the Group’s investment in an entity that could be affected by COVID-19 Meanwhile, the Group’s accounting policy related to COVID-19

Subsidiaries(Table)

Subsidiaries(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Significant Investments In Subsidiaries Abstract [Abstract]
Disclosure Of Interests In Subsidiaries Explanatory	Details of major consolidated subsidiaries as of December 31, 2020, are as follows: Investor Investee Ownership Location Date of Industry KB Financial Group Inc. Kookmin Bank 100.00 Korea Dec. 31 Banking and foreign exchange transaction KB Securities Co., Ltd. 100.00 Korea Dec. 31 Financial investment KB Insurance Co., Ltd. 100.00 Korea Dec. 31 Non-life KB Kookmin Card Co., Ltd. 100.00 Korea Dec. 31 Credit card and installment financing Prudential Life Insurance Company of Korea Ltd. 100.00 Korea Dec. 31 Life insurance KB Asset Management Co., Ltd. 100.00 Korea Dec. 31 Collective investment and advisory KB Capital Co., Ltd. 100.00 Korea Dec. 31 Financial Leasing KB Life Insurance Co., Ltd. 100.00 Korea Dec. 31 Life insurance KB Real Estate Trust Co., Ltd. 100.00 Korea Dec. 31 Real estate trust management KB Savings Bank Co., Ltd. 100.00 Korea Dec. 31 Savings banking KB Investment Co., Ltd. 100.00 Korea Dec. 31 Capital investment KB Data System Co., Ltd. 100.00 Korea Dec. 31 Software advisory, development, and supply KB Credit Information Co., Ltd. 100.00 Korea Dec. 31 Collection of receivables or credit investigation Kookmin Bank Kookmin Bank Cambodia Plc. 100.00 Cambodia Dec. 31 Banking and foreign exchange transaction Kookmin Bank (China) Ltd. 100.00 China Dec. 31 Banking and foreign exchange transaction KB Microfinance Myanmar Co., Ltd. 100.00 Myanmar Dec. 31 Microfinance services PRASAC Microfinance Institution Plc. 70.00 Cambodia Dec. 31 Microfinance services PT Bank Bukopin TBK 67.00 Indonesia Dec. 31 Banking and foreign exchange transaction PT Bank Syariah Bukopin 92.78 Indonesia Dec. 31 Banking PT Bukopin Finance 97.03 Indonesia Dec. 31 Installment financing KB Bank Myanmar Co., Ltd. 100.00 Myanmar Dec. 31 Banking and foreign exchange transaction KB Securities Co., Ltd. KBFG Securities America Inc. 100.00 United States Dec. 31 Investment advisory and securities dealing activities KB Securities Hong Kong Ltd. 100.00 China Dec. 31 Investment advisory and securities dealing activities KB Securities Vietnam Joint Stock Company 99.70 Vietnam Dec. 31 Investment advisory and securities dealing activities KB FINA Joint Stock Company 100.00 Vietnam Dec. 31 Investment advisory and securities dealing activities KB Insurance Co., Ltd. Leading Insurance Services, Inc. 100.00 United States Dec. 31 Management service LIG Insurance (China) Co., Ltd. 100.00 China Dec. 31 Non-life PT. KB Insurance Indonesia 70.00 Indonesia Dec. 31 Non-life KB Claims Survey & Adjusting 100.00 Korea Dec. 31 Claim service KB Sonbo CNS 100.00 Korea Dec. 31 Management service KB Golden Life Care Co., Ltd. 100.00 Korea Dec. 31 Service KB Kookmin Card Co., Ltd. KB Daehan Specialized Bank Plc. 95.71 Cambodia Dec. 31 Auto Installment finance PT. KB Finansia Multi Finance 80.00 Indonesia Dec. 31 Auto Installment finance KB Capital Co., Ltd. PT Sunindo Kookmin Best Finance 85.00 Indonesia Dec. 31 Auto Installment finance KB Kookmin Card Co., Ltd., KB Capital Co., Ltd. KB KOLAO LEASING CO., LTD. 80.00 Laos Dec. 31 Auto Installment finance KB Asset Management Co., Ltd. KBAM Shanghai Advisory Services Co., Ltd. 100.00 China Dec. 31 General advisory Details of consolidated structured entities as of December 31, 2020, are as follows: Consolidated structured entities Reasons for consolidation Trusts Kookmin Bank (development trust) and 10 others The Group controls the trust because it has power to determine management performance of the trust and is significantly exposed to variable returns that absorb losses through the guarantees of payment of principal, or payment of principal and fixed rate of return. Asset-backed securitization Able Hana Co., Ltd. and 127 others The Group controls these investees because it has power over relevant activities in the event of default, is significantly exposed to variable returns by providing lines of credit, ABCP purchase commitments or acquisition of subordinated debt and has ability to affect those returns through its power. Investment funds KB Global Platform Fund and 151 others Funds are consolidated if the Group, as a collective investor or operating manager (member), etc., can manage fund assets on behalf of other investors, or dismiss the collective investor and operating manager, and is substantially exposed to significant variable returns or has such rights. If the Group holds more than a majority of the ownership interests but does not have the power over relevant activities of structured entities in accordance with agreements with trust and other related parties, those structured entities are excluded from the consolidation.
Schedule Of Condensed Financial Information Of Subsidiaries Table Text Block [Text Block]	Condensed financial information of major subsidiaries as of December 31, 2019 and 2020, and for the years ended December 31, 2019 and 2020, are as follows: December 31, 2019 2019 Assets Liabilities Equity Operating Profit (loss) Total (In millions of Korean won) Kookmin Bank 1 ￦ 387,425,038 ￦ 358,420,805 ￦ 29,004,233 ￦ 20,817,431 ￦ 2,439,079 ￦ 2,428,154 KB Securities Co., Ltd. 1,2 47,816,512 43,131,858 4,684,654 8,053,363 257,893 261,639 KB Insurance Co., Ltd. 1,2 36,552,368 32,689,460 3,862,908 12,661,927 234,327 366,362 KB Kookmin Card Co., Ltd. 1 22,990,114 18,925,195 4,064,919 3,102,186 316,546 306,251 KB Asset Management Co., Ltd. 1 310,018 114,776 195,242 148,780 48,899 48,490 KB Capital Co., Ltd. 1,2 11,190,568 10,036,077 1,154,491 931,694 117,028 115,524 KB Life Insurance Co., Ltd. 1 9,801,905 9,186,567 615,338 1,506,417 15,963 63,107 KB Real Estate Trust Co., Ltd. 377,938 85,132 292,806 119,899 61,713 61,672 KB Savings Bank Co., Ltd. 1,361,032 1,148,625 212,407 92,435 16,301 15,433 KB Investment Co., Ltd. 1 756,972 542,221 214,751 99,822 11,311 11,310 KB Data System Co., Ltd. 41,690 20,999 20,691 158,067 4,664 4,282 KB Credit Information Co., Ltd. 27,834 12,936 14,898 38,278 (256 ) (337 ) December 31, 2020 2020 Assets Liabilities Equity Operating Profit (loss) Total (In millions of Korean won) Kookmin Bank 1 ￦ 438,444,114 ￦ 408,036,040 ￦ 30,408,074 ￦ 24,519,818 ￦ 2,298,195 ￦ 2,905,953 KB Securities Co., Ltd. 1,2 57,570,654 52,516,488 5,054,166 10,040,497 425,622 449,507 KB Insurance Co., Ltd. 1,2 39,078,117 35,086,458 3,991,659 13,735,778 163,884 129,042 KB Kookmin Card Co., Ltd. 1 24,071,644 19,789,958 4,281,686 3,210,581 324,662 308,148 Prudential Life Insurance Company of Korea Ltd. 2 25,121,656 22,681,729 2,439,927 656,062 55,711 (31,718 ) KB Asset Management Co., Ltd. 1 335,601 112,522 223,079 191,427 57,317 57,802 KB Capital Co., Ltd. 1,2 12,823,748 11,392,177 1,431,571 1,300,378 141,646 139,949 KB Life Insurance Co., Ltd. 10,424,916 9,842,789 582,127 1,897,859 (23,185 ) (33,210 ) KB Real Estate Trust Co., Ltd. 1 437,619 108,096 329,523 139,070 66,874 66,718 KB Savings Bank Co., Ltd. 1,883,720 1,658,116 225,604 104,397 17,305 16,197 KB Investment Co., Ltd. 1 848,693 618,552 230,141 128,014 15,387 15,390 KB Data System Co., Ltd. 40,347 23,024 17,323 149,966 (1,729 ) (3,367 ) KB Credit Information Co., Ltd. 27,711 11,773 15,938 39,767 1,132 1,040 1 Financial information is based on its consolidated financial statements. 2 Includes fair value adjustments arising from the acquisition.
Disclosure Of Changes In Subsidiaries [Text Block]	Subsidiaries newly included in consolidation for the year ended December 31, 2020, are as follows: Company Reasons of obtaining control Prudential Life Insurance Company of Korea Ltd. and 27 others Holds more than a majority of the ownership interests KB Hwaseong 1st L.L.C. and 82 others Holds the power in the event of default and is exposed to significant variable returns by providing lines of credit, ABCP purchase commitments or acquisition of subordinated debt KB Global Infrastructure Synergy Private Special Asset Fund and 21 others Holds the power to determine the operation of the funds and is exposed to variable returns by holding significant amount of ownership interests KB Smart Scale Up Fund and 2 others Holds the power as a general partner and is exposed to variable returns by holding significant amount of ownership interests Subsidiaries excluded from consolidation for the year ended December 31, 2020, are as follows: Company Reasons of losing control KBH the 3rd L.L.C and 60 others Termination of the commitments Sechste Casalog KG and 16 others Liquidation KB Contents Panda iMBC Contents Venture Fund and 5 others Disposal Hyundai Smart Index Alpha Securities Feeder Investment Trust No.1 and 27 others Decrease in ownership interests to less than majority

Unconsolidated Structured Ent_2

Unconsolidated Structured Entities(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Unconsolidated Structured Entities Abstract [Abstract]
Disclosure Of Nature Purpose Activity Method Of Financing Of The Unconsolidated Structured Entities [Text Block]	Nature, purpose and activities of the unconsolidated structured entities and how the structured entities are financed, are as follows: Nature Purpose Activity Method of Financing Structured financing Granting PF loans to SOC and real estate Granting loans to ships/aircrafts SPC Construction of SOC and real estate Building ships, construction and purchase of aircrafts Loan commitments through credit line, providing credit line and investment agreements Investment funds Investment in beneficiary certificates Investment in PEF and partnerships Management of fund assets Payment of fund fees and allocation of fund profits Sales of beneficiary certificate instruments Investment from general partners and limited partners Trusts Management of financial trusts; —Development trust —General unspecified money trust —Trust whose principal is not guaranteed —Other trusts Management of trusted financial assets Payment of trust fees and allocation of trust profits. Sales of trusted financial assets Asset-backed securitization Early cash generation through transfer of securitized assets Fees earned through services to SPC, such as providing lines of credit and ABCP purchase commitments Fulfillment of asset-backed securitization plan Purchase and collection of securitized assets Issuance and repayment of ABS and ABCP Issuance of ABS and ABCP based on securitized assets
Disclosure Of Unconsolidated Structured Entities Explanatory	Details of scale of unconsolidated structured entities and nature of the risks associated with the Group’s interests in unconsolidated structured entities as of December 31, 2019 and 2020, are as follows: December 31, 2019 Structured Investment Trusts Asset-backed and others Total (In millions of Korean won) Total assets of unconsolidated structured entities ￦ 54,206,404 ￦ 180,236,568 ￦ 2,287,172 ￦ 99,012,931 ￦ 335,743,075 Carrying amount in the financial statements Assets Financial assets at fair value through profit or loss ￦ 132,685 ￦ 9,846,278 ￦ — ￦ 2,405,228 ￦ 12,384,191 Derivative financial assets — — — 2,959 2,959 Loans measured at amortized cost 4,775,723 293,221 266,974 920,863 6,256,781 Financial investments — — — 5,166,578 5,166,578 Investment in associates — 352,488 — — 352,488 Other assets 1,876 69,353 93,613 9,181 174,023 ￦ 4,910,284 ￦ 10,561,340 ￦ 360,587 ￦ 8,504,809 ￦ 24,337,020 Liabilities Deposits ￦ 523,086 ￦ 90,131 ￦ — ￦ 409,246 ￦ 1,022,463 Derivative financial liabilities — — — 228 228 Other liabilities 1,362 78 — 16,169 17,609 ￦ 524,448 ￦ 90,209 ￦ — ￦ 425,643 ￦ 1,040,300 Maximum exposure* Assets held ￦ 4,910,284 ￦ 10,561,340 ￦ 360,587 ￦ 8,504,809 ￦ 24,337,020 Purchase and investment commitments 38,650 3,980,356 — 945,598 4,964,604 Unused credit 654,203 2,900 28,427 1,927,902 2,613,432 Acceptances and guarantees and loan commitments 1,816,411 7,188 — 600,664 2,424,263 ￦ 7,419,548 ￦ 14,551,784 ￦ 389,014 ￦ 11,978,973 ￦ 34,339,319 Methods of determining the maximum exposure Loan Investments / Trust Providing December 31, 2020 Structured Investment Trusts Asset-backed and others Total (In millions of Korean won) Total assets of unconsolidated structured entities ￦ 56,200,300 ￦ 285,528,467 ￦ 1,984,006 ￦ 116,115,027 ￦ 459,827,800 Carrying amount in the financial statements Assets Financial assets at fair value through profit or loss ￦ 164,996 ￦ 11,151,958 ￦ — ￦ 2,308,917 ￦ 13,625,871 Derivative financial assets — — — 3,005 3,005 Loans measured at amortized cost 4,655,337 379,727 262,382 1,080,824 6,378,270 Financial investments — — — 7,849,054 7,849,054 Investment in associates — 396,953 — — 396,953 Other assets 2,572 3,257 91,297 16,363 113,489 ￦ 4,822,905 ￦ 11,931,895 ￦ 353,679 ￦ 11,258,163 ￦ 28,366,642 Liabilities Deposits ￦ 612,023 ￦ 26,839 ￦ — ￦ 344,221 ￦ 983,083 Derivative financial liabilities — — — 1,307 1,307 Other liabilities 8,422 97 1 13,736 22,256 ￦ 620,445 ￦ 26,936 ￦ 1 ￦ 359,264 ￦ 1,006,646 Maximum exposure* Assets held ￦ 4,822,905 ￦ 11,931,895 ￦ 353,679 ￦ 11,258,163 ￦ 28,366,642 Purchase and investment commitments — 5,650,847 — 761,200 6,412,047 Unused credit 1,322,414 — 18,287 3,020,084 4,360,785 Acceptances and guarantees and loan commitments 883,342 16,650 — 684,257 1,584,249 ￦ 7,028,661 ￦ 17,599,392 ￦ 371,966 ￦ 15,723,704 ￦ 40,723,723 Methods of determining the maximum exposure Loan Investments / Trust Providing * Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.

Related Party Transactions(Tabl

Related Party Transactions(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Transactions Between Related Parties Abstract [Abstract]
Schedule Of Profit And Loss Arising From Related Party Transactions Table Text Block [Text Block]	Profit or loss arising from transactions with related parties for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 2019 2020 (In millions of Korean won) Associates and joint ventures Balhae Infrastructure Company Fee and commission income ￦ 6,691 ￦ 6,743 ￦ 6,817 Korea Credit Bureau Co., Ltd. Interest expense 127 21 7 Fee and commission income 1,194 1,056 957 Insurance income — 3 5 Fee and commission expense 1,909 2,541 3,280 Other operating expense 4 — 1 KB GwS Private Securities Investment Trust Fee and commission income 851 851 853 Incheon Bridge Co., Ltd. Interest income 9,426 8,612 4,345 Interest expense 296 483 334 Fee and commission income 9 — 23 Fee and commission expense 2 7 6 Insurance income 365 284 279 Gains on financial instruments at fair value through profit or loss 2,655 4,975 899 Reversal of credit losses 6 5 — Provision for credit losses 1 1 472 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 Fee and commission income 210 178 12 Aju Good Technology Venture Fund Interest expense 30 22 18 KB Star Office Private Real Estate Investment Trust No.1 Interest income 370 370 371 Interest expense 93 208 61 Fee and commission income 435 435 436 RAND Bio Science Co., Ltd. Interest expense 3 5 11 Other non-operating — 843 — SY Auto Capital Co., Ltd. Interest income 1,279 1,016 1,097 Interest expense — 1 2 Fee and commission income 73 34 39 Fee and commission expense 840 389 132 Insurance income 33 32 40 Other operating income 621 689 1,709 Other operating expense 415 288 121 Reversal of credit losses — 13 17 Provision for credit losses 14 — — Food Factory Co., Ltd. Interest income 9 41 52 Interest expense — — 12 Insurance income 5 4 5 Fee and commission expense 1 12 4 Gains on financial instruments at fair value through profit or loss 30 60 72 Reversal of credit losses 1 — — Provision for credit losses 1 1 8 KB Pre IPO Secondary Venture Fund No.1 Interest expense 27 7 3 Fee and commission income 110 110 110 Built On Co., Ltd.* Interest income 4 1 — Insurance income 2 1 — Losses on financial instruments at fair value through profit or loss 1 — — KB Private Equity Fund No.3 Fee and commission income 521 480 463 Wise Asset Management Co., Ltd. Interest expense 9 2 — Acts Co., Ltd. Interest income — 1 1 Insurance income 2 1 — Gains on financial instruments at fair value through profit or loss — 30 — Losses on financial instruments at fair value through profit or loss 1,851 — — Other non-operating 1,246 — — Dongjo Co., Ltd. Insurance income 2 2 1 Reversal of credit losses 31 — — APRO Co., Ltd.* Interest income — 19 7 Interest expense 1 4 1 Fee and commission expense — 17 — Insurance income 5 4 1 Provision for credit losses — — 1 POSCO-KB Fee and commission income 490 490 387 Interest expense 81 — — Dae-A Interest expense 9 8 7 Paycoms Co., Ltd. Interest income 10 10 10 Insurance income 1 1 — Gains on financial instruments at fair value through profit or loss 125 125 69 Big Dipper Co., Ltd. Fee and commission expense — — 768 Reversal of credit losses 2 — — KB-KDBC Pre-IPO Interest expense 39 58 23 Fee and commission income 322 449 300 KB-TS Fee and commission income 305 730 126 KB-SJ Fee and commission income 314 422 338 JLK Inspection Co., Ltd.* Interest income 6 — — Interest expense — 1 — TESTIAN Inc.* Interest income 4 3 — Gains on financial instruments at fair value through profit or loss 83 — — Rainist Co., Ltd. Gains on financial instruments at fair value through profit or loss — — 1,636 Fee and commission income — 39 36 Fee and commission expense — — 5 Interest expense 2 — — Iwon Alloy Co., Ltd. Insurance income 1 2 1 Bioprotect Ltd. Losses on financial instruments at fair value through profit or loss — — 216 RMGP Bio-Pharma Fee and commission income — — 27 Other non-operating 10 33 — Gains on financial instruments at fair value through profit or loss — 947 — Losses on financial instruments at fair value through profit or loss — 2,120 489 RMGP Bio-Pharma Losses on financial instruments at fair value through profit or loss — — 1 KB-MDI Fee and commission income — — 308 Losses on financial instruments at fair value through profit or loss — — 322 S&E BIO Interest expense — — 1 Contents First Interest expense — — 14 December & Company Inc. Interest expense — — 1 GENINUS Inc. Interest expense — — 70 Hasys. Gains on financial instruments at fair value through profit or loss — 136 — Losses on financial instruments at fair value through profit or loss 136 — — Insurance income 4 50 63 KB-Brain Scale-up Interest expense 21 89 40 Fee and commission income 108 735 734 Spark Biopharma Inc.* Interest expense 25 59 — SKYDIGITAL INC. Fee and commission income — — 4 KB No.8 Special Purpose Acquisition Company* Interest expense 17 — — Losses on financial instruments at fair value through profit or loss 2,330 — — KB No.9 Special Purpose Acquisition Company* Interest expense 43 (23 ) — Gains on financial instruments at fair value through profit or loss 48 — — Losses on financial instruments at fair value through profit or loss 2,256 — — KB No.10 Special Purpose Acquisition Company* Interest expense 30 18 — Gains on financial instruments at fair value through profit or loss 121 3,066 — KB No.11 Special Purpose Acquisition Company* Interest expense 12 9 — Gains on financial instruments at fair value through profit or loss 56 118 — KB No.17 Special Purpose Acquisition Company Fee and commission income — 175 — Gains on financial instruments at fair value through profit or loss — 1,384 4 Interest expense — 28 25 KB No.18 Special Purpose Acquisition Company Fee and commission income — 263 — Gains on financial instruments at fair value through profit or loss — 1,898 84 Interest expense — 28 31 KB No.19 Special Purpose Acquisition Company Fee and commission income — 150 — Gains on financial instruments at fair value through profit or loss — 1,044 11 Interest expense — 8 13 KB No.20 Special Purpose Acquisition Company Fee and commission income — — 210 Gains on financial instruments at fair value through profit or loss — — 1,568 Interest expense — 3 25 KB SPROTT Renewable Private Equity Fund No.1 Fee and commission income — 490 488 KB-Stonebridge Fee and commission income — 1,444 1,442 COSES GT Losses on financial instruments at fair value through profit or loss — 5 — Interest income — — 6 Provision for credit losses — — 4 WJ Private Equity Fund No.1 Fee and commission income — — 5 UPRISE, Inc. Interest income — — 2 Provision for credit losses — — 1 CWhy Inc. Losses on financial instruments at fair value through profit or loss — — 2,000 Insurance income — 3 — Stratio, Inc. Interest expense — 1 — NEXELON Inc.* Interest expense — 2 — CellinCells Co., Ltd. Interest expense — 19 4 Bomapp Inc. Fee and commission expense — — 9 Interest expense — 1 — Insurance income — 1 8 KB Social Impact Investment Fund Fee and commission income — 121 300 KB-UTC Fee and commission income — — 371 KBSP Private Equity Fund No.4 Fee and commission income — — 480 KB-NAU Fee and commission income — — 237 JR GLOBAL REIT Fee and commission income — — 6,210 IGIS No.371 Professional Investors’ Real Estate Investment Company* Fee and commission income — — 200 Koreit Tower Real Estate Investment Trust Company* Fee and commission income — — 2,852 2020 KB Fintech Renaissance Fund Fee and commission income — — 60 KB Material and Parts No.1 PEF Fee and commission income — — 63 FineKB Private Equity Fund No.1 Fee and commission income — — 38 Bluepointpartners Inc. Losses on financial instruments at fair value through profit or loss — — 68 KB-Solidus Fee and commission income — 81 777 Fabric Time Co., Ltd. Fee and commission income — — 9 Interest expense — — 47 BNF Corporation Ltd.* Interest income — 7 401 Fee and commission income — — 2 Gains on financial instruments at fair value through profit or loss — 158 — Provision for credit losses — 1 8 KB Cape No.1 Private Equity Fund Fee and commission income — 97 144 ALS Co., Ltd.* Interest income — 194 — Keystone-Hyundai Securities No.1 Private Equity Fund Fee and commission income 116 90 115 MJT&I Corp. Insurance income — 1 — Doosung Metal Co., Ltd.* Insurance income 1 — — Hyundai-Tongyang Agrifood Private Equity Fund* Fee and commission income 151 — — Bungaejangter. Inc.* Interest income 60 — — Inno Lending Co., Ltd.* Fee and commission income 1 — — KoFC KBIC Frontier Champ 2010-5(PEF)* Fee and commission income 197 — — Other Retirement pension Fee and commission income 876 939 1,077 Interest expense 3 4 3 * Excluded from the Group’s related party as of December 31, 2020. Meanwhile, the Group purchased installment financial assets, etc. from SY Auto Capital Co., Ltd. amounting to ￦ 1,393,346 million and ￦ 1,504,217 million for the years ended December 31, 2019 and 2020, respectively.
Schedule Of Outstanding Balances For Related Party Transactions Table Text Block [Text Block]	Details of receivables and payables, and related allowances for credit losses arising from transactions with related parties as of December 31, 2019 and 2020, are as follows: December 31, December 31, (In millions of Korean won) Associates and joint ventures Balhae Infrastructure Company Other assets ￦ 1,718 ￦ 1,733 Korea Credit Bureau Co., Ltd. Loans measured at amortized cost (gross amount) 43 36 Deposits 17,966 19,982 Provisions 1 — Insurance liabilities 2 1 Other liabilities — 623 KB GwS Private Securities Investment Trust Other assets 641 641 Incheon Bridge Co., Ltd. Financial assets at fair value through profit or loss 37,857 38,756 Loans measured at amortized cost (gross amount) 147,707 133,002 Allowances for credit losses 12 202 Other assets 520 545 Deposits 45,447 39,520 Provisions 10 292 Insurance liabilities 108 109 Other liabilities 346 205 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 Other assets 89 — Jungdo Co., Ltd. Deposits 4 4 Dongjo Co., Ltd. Insurance liabilities 1 1 Dae-A Deposits 753 636 Other liabilities 14 21 Aju Good Technology Venture Fund Deposits 5,456 3,093 Other liabilities 2 1 KB Star Office Private Real Estate Investment Trust No.1 Loans measured at amortized cost (gross amount) 10,000 10,000 Allowances for credit losses 4 5 Other assets 136 137 Deposits 8,293 4,255 Other liabilities 66 24 KB-Brain Scale-up Deposits 13,118 8,097 Other liabilities 4 1 WJ Private Equity Fund No.1 Other assets — 2 Deposits — 349 KB IGen Private Equity Fund No.1* Deposits 147 — KB Cape No.1 Private Equity Fund Financial assets at fair value through profit or loss 2,000 2,000 Other assets — 144 RAND Bio Science Co., Ltd. Deposits 4,452 693 Loans measured at amortized cost (gross amount) 1 1 SY Auto Capital Co., Ltd. Loans measured at amortized cost (gross amount) 41,990 40,060 Allowances for credit losses 4 57 Other assets 63 65 Deposits 8 6 Provisions 13 — Insurance liabilities 13 13 Other liabilities 70 76 Food Factory Co., Ltd. Financial assets at fair value through profit or loss 590 662 Loans measured at amortized cost (gross amount) 1,992 3,210 Allowances for credit losses 2 8 Other assets 1 3 Deposits 1,073 1,555 Provisions — 2 Insurance liabilities 4 5 Other liabilities 1 9 KB Pre IPO Secondary Venture Fund No.1 Deposits 2,955 629 Other liabilities 1 — Wise Asset Management Co., Ltd. Deposits 21 — Acts Co., Ltd. Deposits 1 18 Insurance liabilities — 1 Other liabilities 100 100 POSCO-KB Other assets — 264 Paycoms Co., Ltd. Other assets 1 1 Financial assets at fair value through profit or loss 1,157 1,226 Deposits 1 1 Big Dipper Co., Ltd. Loans measured at amortized cost (gross amount) 11 4 Deposits 6 1 KB-KDBC Pre-IPO Deposits 7,054 923 Other liabilities 4 — APRO Co., Ltd.* Loans measured at amortized cost (gross amount) 2,019 — Insurance liabilities 2 — Deposits 3,201 — Other liabilities 1 — Iwon Alloy Co., Ltd. Insurance liabilities 1 — Computerlife Co., Ltd. Deposits 1 — RMGP Bio-Pharma Financial assets at fair value through profit or loss 3,419 4,250 Other liabilities 2 71 RMGP Bio-Pharma Financial assets at fair value through profit or loss 8 9 Hasys. Financial assets at fair value through profit or loss 6,000 6,000 Deposits — 1 Insurance liabilities 37 39 SKYDIGITAL INC. Deposits 25 15 Rainist Co., Ltd. Financial assets at fair value through profit or loss 7,504 9,141 UPRISE, Inc. Financial assets at fair value through profit or loss 250 250 Loans measured at amortized cost (gross amount) — 500 Allowances for credit losses — 1 Deposits — 11 Stratio, Inc. Financial assets at fair value through profit or loss 1,000 1,000 Deposits 726 13 Honest Fund, Inc. Financial assets at fair value through profit or loss 3,999 3,999 CellinCells Co., Ltd. Financial assets at fair value through profit or loss 2,000 2,000 Loans measured at amortized cost (gross amount) 4 24 Deposits 1,545 260 Other liabilities 1 — Jo Yang Industrial Co., Ltd. Deposits 2 2 KB No.17 Special Purpose Acquisition Company Financial assets at fair value through profit or loss 2,683 2,687 Deposits 1,742 1,711 Other liabilities 27 23 KB No.18 Special Purpose Acquisition Company Financial assets at fair value through profit or loss 3,786 3,873 Deposits 2,140 2,101 Other liabilities 28 19 KB No.19 Special Purpose Acquisition Company Financial assets at fair value through profit or loss 2,043 2,055 Deposits 1,093 1,053 Other liabilities 7 3 KB No.20 Special Purpose Acquisition Company Financial assets at fair value through profit or loss 1,499 3,067 Deposits 1,984 1,716 Other liabilities 3 1 COSES GT Financial assets at fair value through profit or loss 2,930 4,930 Loans measured at amortized cost (gross amount) — 500 Allowances for credit losses — 4 Other assets — 1 Deposits — 292 Insurance liabilities — 1 CWhy Inc. Financial assets at fair value through profit or loss 2,000 — Bomapp Inc. Financial assets at fair value through profit or loss 1,999 1,999 Insurance liabilities 2 2 Channel Corporation Financial assets at fair value through profit or loss 2,000 4,551 MitoImmune Therapeutics Financial assets at fair value through profit or loss 5,000 5,000 KB-Solidus Other assets — 707 Bioprotect Ltd. Financial assets at fair value through profit or loss — 3,264 GOMI CORPORATION Financial assets at fair value through profit or loss — 500 Loans measured at amortized cost (gross amount) — 9 Deposits — 37 Copin Communications, Inc. Financial assets at fair value through profit or loss — 1,500 Go2joy Co., Ltd. Financial assets at fair value through profit or loss — 1,200 ClavisTherapeutics, Inc. Financial assets at fair value through profit or loss — 2,000 S&E BIO Financial assets at fair value through profit or loss — 2,000 Deposits — 1,142 Bluepointpartners Inc. Financial assets at fair value through profit or loss — 1,432 4N Inc. Financial assets at fair value through profit or loss — 200 Deposits — 76 Xenohelix Co., Ltd. Financial assets at fair value through profit or loss — 2,100 Contents First Financial assets at fair value through profit or loss — 6,146 Deposits — 1,823 Other liabilities — 7 KB-MDI Financial assets at fair value through profit or loss — 4,280 Other assets — 308 OKXE Inc. Financial assets at fair value through profit or loss — 800 GENINUS Inc. Financial assets at fair value through profit or loss — 5,599 Deposits — 13,630 Other liabilities — 15 FineKB Private Equity Fund No.1 Other assets — 38 NEOMIO CORP. Deposits — 535 December & Company Inc. Deposits — 1 KB Social Impact Investment Fund Other assets 73 — Fabric Time Co., Ltd. Financial assets at fair value through profit or loss 1,845 3,345 Loans measured at amortized cost (gross amount) — 59 Provisions — 1 Deposits 395 3,947 Other liabilities 2 40 BNF Corporation Ltd.* Financial assets at fair value through profit or loss 2,259 — Loans measured at amortized cost (gross amount) 1,400 — Other assets 2 — Deposits 947 — Other liabilities 6 — Key management Loans measured at amortized cost (gross amount) 3,538 5,153 Allowances for credit losses 1 2 Other assets 3 5 Deposits 15,339 17,167 Insurance liabilities 1,984 2,501 Other liabilities 289 371 Other Retirement pension Other assets 366 295 Other liabilities 17,620 10,600 * Excluded from the Group’s related party as of December 31, 2020, therefore, the remaining outstanding balances with those entities are not disclosed.
Schedule Of Significant Loan Transactions With Related Parties Table Text Block [Text Block]	Significant lending transactions with related parties for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Increase Decrease Ending (In millions of Korean won) Associates and joint ventures Korea Credit Bureau Co., Ltd. ￦ 22 ￦ 43 ￦ (22 ) ￦ 43 Incheon Bridge Co., Ltd. 191,088 4,982 (10,506 ) 185,564 KB Star Office Private Real Estate Investment Trust No.1 10,000 — — 10,000 KB Cape No.1 Private Equity Fund — 2,000 — 2,000 RAND Bio Science Co., Ltd. 1 1 (1 ) 1 SY Auto Capital Co., Ltd. 48,356 28,088 (34,454 ) 41,990 Food Factory Co., Ltd. 730 1,872 (20 ) 2,582 Built On Co., Ltd.* 401 — (401 ) — Acts Co., Ltd. — 68 (68 ) — Paycoms Co., Ltd. 1,032 125 — 1,157 Big Dipper Co., Ltd. 5 11 (5 ) 11 APRO Co., Ltd.* — 2,019 — 2,019 JLK Inspection Co., Ltd.* 7,300 (7,300 ) — — TESTIAN Inc.* 615 24 (639 ) — RMGP Bio-Pharma 3,051 368 — 3,419 RMGP Bio-Pharma 4 4 — 8 Hasys. 5,864 136 — 6,000 Rainist Co., Ltd. 2,504 5,000 — 7,504 Spark Biopharma Inc.* 6,500 (6,500 ) — — UPRISE, Inc. 250 — — 250 Stratio, Inc. 1,000 — — 1,000 Honest Fund, Inc. — 3,999 — 3,999 CellinCells Co., Ltd. — 2,004 — 2,004 KB No.9 Special Purpose Acquisition Company* 2,481 — (2,481 ) — KB No.10 Special Purpose Acquisition Company* 2,025 — (2,025 ) — KB No.11 Special Purpose Acquisition Company* 737 — (737 ) — KB No.17 Special Purpose Acquisition Company — 2,683 — 2,683 KB No.18 Special Purpose Acquisition Company — 3,786 — 3,786 KB No.19 Special Purpose Acquisition Company — 2,043 — 2,043 KB No.20 Special Purpose Acquisition Company — 1,499 — 1,499 COSES GT — 2,930 — 2,930 CWhy Inc. — 2,000 — 2,000 Bomapp Inc. — 1,999 — 1,999 Channel Corporation — 2,000 — 2,000 MitoImmune Therapeutics — 5,000 — 5,000 Fabric Time Co., Ltd. — 1,845 — 1,845 BNF Corporation Ltd.* — 3,659 — 3,659 Key management 2,404 2,006 (872 ) 3,538 2020 Beginning Increase Decrease Ending (In millions of Korean won) Associates and joint ventures Korea Credit Bureau Co., Ltd. ￦ 43 ￦ 36 ￦ (43 ) ￦ 36 Incheon Bridge Co., Ltd. 185,564 901 (14,707 ) 171,758 Carlife Co., Ltd. — 22 (22 ) — KB Star Office Private Real Estate Investment Trust No.1 10,000 — — 10,000 KB Cape No.1 Private Equity Fund 2,000 — — 2,000 RAND Bio Science Co., Ltd. 1 1 (1 ) 1 SY Auto Capital Co., Ltd. 41,990 11,310 (13,240 ) 40,060 Food Factory Co., Ltd. 2,582 1,314 (24 ) 3,872 Acts Co., Ltd. — 74 (74 ) — Paycoms Co., Ltd. 1,157 69 — 1,226 Big Dipper Co., Ltd. 11 4 (11 ) 4 APRO Co., Ltd.* 2,019 2,000 (4,019 ) — RMGP Bio-Pharma 3,419 831 — 4,250 RMGP Bio-Pharma 8 1 — 9 Hasys. 6,000 — — 6,000 Rainist Co., Ltd. 7,504 1,637 — 9,141 UPRISE, Inc. 250 500 — 750 Stratio, Inc. 1,000 — — 1,000 Honest Fund, Inc. 3,999 — — 3,999 CellinCells Co., Ltd. 2,004 24 (4 ) 2,024 KB No.17 Special Purpose Acquisition Company 2,683 4 — 2,687 KB No.18 Special Purpose Acquisition Company 3,786 87 — 3,873 KB No.19 Special Purpose Acquisition Company 2,043 12 — 2,055 KB No.20 Special Purpose Acquisition Company 1,499 1,568 — 3,067 COSES GT 2,930 2,500 — 5,430 CWhy Inc. 2,000 — (2,000 ) — Bomapp Inc. 1,999 — — 1,999 Channel Corporation 2,000 2,551 — 4,551 MitoImmune Therapeutics 5,000 — — 5,000 Bioprotect Ltd. — 3,264 — 3,264 GOMI CORPORATION — 509 — 509 Copin Communications, Inc. — 1,500 — 1,500 Go2joy Co., Ltd. — 1,200 — 1,200 ClavisTherapeutics, Inc. — 2,000 — 2,000 S&E BIO — 2,000 — 2,000 Bluepointpartners Inc. — 1,432 — 1,432 4N Inc. — 200 — 200 Xenohelix Co., Ltd. — 2,100 — 2,100 Contents First — 6,146 — 6,146 KB-MDI — 4,280 — 4,280 Fabric Time Co., Ltd. 1,845 1,559 — 3,404 OKXE Inc. — 800 — 800 GENINUS Inc. — 5,599 — 5,599 BNF Corporation Ltd.* 3,659 1,000 (4,659 ) — Key management 3,538 5,141 (3,526 ) 5,153 * Excluded from the Group’s related party as of December 31, 2020.
Schedule Of Significant Borrowing Transactions With Related Parties Table Text Block [Text Block]	Significant borrowing transactions with related parties for the years ended December 31, 2019 and 2020, are as follows: 2019 Beginning Borrowing Repayment Others 1 Ending (In millions of Korean won) Associates and joint ventures Korea Credit Bureau Co., Ltd. ￦ 15,674 ￦ — ￦ (3,000 ) ￦ 5,292 ￦ 17,966 Incheon Bridge Co., Ltd. 43,666 25,260 (5,260 ) (18,219 ) 45,447 Doosung Metal Co., Ltd. 3 — — (3 ) — Jungdo Co., Ltd. 4 — — — 4 Dae-A 1,229 — — (476 ) 753 Carlife Co., Ltd. 2 — — (2 ) — Computerlife Co., Ltd. 1 — — — 1 SKYDIGITAL INC. 16 — — 9 25 Jo Yang Industrial Co., Ltd. — — — 2 2 Aju Good Technology Venture Fund 6,439 — — (983 ) 5,456 KB-KDBC Pre-IPO 7,088 15,000 (10,000 ) (5,034 ) 7,054 KB-Brain Scale-up 18,813 — — (5,695 ) 13,118 KB Star Office Private Real Estate Investment Trust No.1 7,946 5,018 (5,072 ) 401 8,293 SY Auto Capital Co., Ltd. 5 — — 3 8 KB No.9 Special Purpose Acquisition Company 2 2,275 — (2,266 ) (9 ) — KB No.10 Special Purpose Acquisition Company 2 1,666 — (1,618 ) (48 ) — KB No.11 Special Purpose Acquisition Company 2 658 — (530 ) (128 ) — KB No.17 Special Purpose Acquisition Company — 1,500 — 242 1,742 KB No.18 Special Purpose Acquisition Company — 2,200 (100 ) 40 2,140 KB No.19 Special Purpose Acquisition Company — 1,000 — 93 1,093 KB No.20 Special Purpose Acquisition Company — 1,500 — 484 1,984 RAND Bio Science Co., Ltd. 232 1,900 — 2,320 4,452 Wise Asset Management Co., Ltd. 696 — (682 ) 7 21 Built On Co., Ltd. 2 7 — — (7 ) — Food Factory Co., Ltd. 68 — — 1,005 1,073 Acts Co., Ltd. 29 — — (28 ) 1 Paycoms Co., Ltd. 1 — — — 1 Big Dipper Co., Ltd. 182 — — (176 ) 6 APRO Co., Ltd. 2 2,201 — — 1,000 3,201 Rainist Co., Ltd. 1 — — (1 ) — Spark Biopharma Inc. 2 2,630 17,000 (9,000 ) (10,630 ) — Stratio, Inc. 516 — — 210 726 NEXELON Inc. 2 — — (200 ) 200 — CellinCells Co., Ltd. — — — 1,545 1,545 KB IGen Private Equity Fund No.1 2 148 — — (1 ) 147 KB Pre IPO Secondary Venture Fund No.1 1,115 — — 1,840 2,955 Fabric Time Co., Ltd. — — — 395 395 BNF Corporation Ltd. 2 — — — 947 947 Key management 13,818 13,520 (14,611 ) 2,611 15,338 2020 Beginning Borrowing Repayment Others 1 Ending (In millions of Korean won) Associates and joint ventures Korea Credit Bureau Co., Ltd. ￦ 17,966 ￦ 1,000 ￦ — ￦ 1,016 ￦ 19,982 Incheon Bridge Co., Ltd. 45,447 20,000 (21,260 ) (4,667 ) 39,520 Jungdo Co., Ltd. 4 — — — 4 Dae-A 753 — — (117 ) 636 Computerlife Co., Ltd. 1 — — (1 ) — SKYDIGITAL INC. 25 — — (10 ) 15 Jo Yang Industrial Co., Ltd. 2 — — — 2 Aju Good Technology Venture Fund 5,456 1,442 — (3,805 ) 3,093 KB-KDBC Pre-IPO 7,054 1,500 (6,500 ) (1,131 ) 923 KB-Brain Scale-up 13,118 — — (5,021 ) 8,097 NEOMIO CORP. — — — 535 535 WJ Private Equity Fund No.1 — — — 349 349 KB Star Office Private Real Estate Investment Trust No.1 8,293 2,117 (5,630 ) (525 ) 4,255 SY Auto Capital Co., Ltd. 8 — — (2 ) 6 KB No.17 Special Purpose Acquisition Company 1,742 1,525 (1,500 ) (56 ) 1,711 KB No.18 Special Purpose Acquisition Company 2,140 2,063 (2,100 ) (2 ) 2,101 KB No.19 Special Purpose Acquisition Company 1,093 1,000 (1,000 ) (40 ) 1,053 KB No.20 Special Purpose Acquisition Company 1,984 1,522 (1,500 ) (290 ) 1,716 RAND Bio Science Co., Ltd. 4,452 2,250 (3,750 ) (2,259 ) 693 Wise Asset Management Co., Ltd. 21 — — (21 ) — Food Factory Co., Ltd. 1,073 1,503 (1,003 ) (18 ) 1,555 Acts Co., Ltd. 1 — — 17 18 Paycoms Co., Ltd. 1 — — — 1 Big Dipper Co., Ltd. 6 — — (5 ) 1 APRO Co., Ltd. 2 3,201 — — (3,201 ) — Hasys. — — — 1 1 Stratio, Inc. 726 — — (713 ) 13 UPRISE, Inc. — — — 11 11 CellinCells Co., Ltd. 1,545 — — (1,285 ) 260 COSES GT — — — 292 292 Fabric Time Co., Ltd. 395 7,002 (3,801 ) 351 3,947 BNF Corporation Ltd. 2 947 — — (947 ) — GOMI CORPORATION — — — 37 37 S&E BIO — — — 1,142 1,142 KB IGen Private Equity Fund No.1 2 147 — — (147 ) — KB Pre IPO Secondary Venture Fund No.1 2,955 — — (2,326 ) 629 4N Inc. — — — 76 76 Contents First — 4,000 (3,000 ) 823 1,823 December & Company Inc. — — — 1 1 GENINUS Inc. — — — 13,630 13,630 Key management 15,338 21,319 (20,410 ) 920 17,167 1 Transactions between related parties, such as settlements arising from operating activities and deposits, are expressed in net amount. 2 Excluded from the Group’s related party as of December 31, 2020.
Schedule Of Significant Investment And Collection Transactions With Related Parties Table Text Block [Text Block]	Significant investment and withdrawal transactions with related parties for the years ended December 31, 2019 and 2020, are as follows: 2019 2020 Equity Withdrawal Equity Withdrawal (In millions of Korean won) Balhae Infrastructure Company ￦ 592 ￦ 6,855 ￦ 894 ￦ 6,973 KB GwS Private Securities Investment Trust — 7,276 — 9,523 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 — — — 3,230 POSCO-KB 2,500 — 5,000 2,125 KB Pre IPO Secondary Venture Fund No.1 — — — 585 KB-KDBC Pre-IPO 5,000 — — 6,400 KB-SJ 1,500 — 1,500 — Korea Credit Bureau Co., Ltd. — 135 — 90 KB-UTC 450 — 16,965 — KB-Solidus 10,400 13,520 10,920 4,940 KB-Stonebridge 7,070 1,855 9,093 — WJ Private Equity Fund No.1 — — 10,000 — All Together Korea Fund No.2 — — 100,000 90,127 KB Star Office Private Real Estate Investment Trust No.1 — 1,275 — 1,273 KB SPROTT Renewable Private Equity Fund No.1 1,667 — 4,129 — KB-NAU — — 5,700 — JR GLOBAL REIT — — 219,493 3,639 IGIS No.371 Professional Investors’ Real Estate Investment Company* — — 10,000 10,000 Koreit Tower Real Estate Investment Trust Company* — — 30,000 30,000 Project Vanilla Co., Ltd. — — 2,450 — December & Company Inc. — — 30,000 — KB Social Impact Investment Fund 1,500 — 1,500 — 2020 KB Fintech Renaissance Fund — — 550 — KB Material and Parts No.1 PEF — — 3,400 — KB Private Equity Fund No.3 — — — 8,000 KoFC KBIC Frontier Champ 2010-5 — 138 — — KB-TS 7,840 2,240 2,240 5,488 KB-Brain Scale-up 14,000 — 8,000 3,200 KB Cape No.1 Private Equity Fund 2,000 — — — Aju Good Technology Venture Fund 1,960 — — 2,885 KB No.9 Special Purpose Acquisition Company* — 16 — — KB No.17 Special Purpose Acquisition Company 1 — — — KB No.18 Special Purpose Acquisition Company 1 — — — KB No.19 Special Purpose Acquisition Company 1 — — — KB No.20 Special Purpose Acquisition Company 1 — — — KBSP Private Equity Fund No.4 6,100 — — — * Excluded from the Group’s related party as of December 31, 2020.
Schedule Of Commitments Made On Behalf Of Entity Related Party Transactions Table Text Block [Text Block]	Unused commitments provided to related parties as of December 31, 2019 and 2020, are as follows: December 31, 2019 December 31, 2020 (In millions of Korean won or in a Associates and joint ventures Balhae Infrastructure Company Purchase of securities ￦ 7,327 ￦ 6,433 Korea Credit Bureau Co., Ltd. Unused lines of credit for credit card 557 564 KB GwS Private Securities Investment Trust Purchase of securities 876 — Aju Good Technology Venture Fund Purchase of securities 1,154 — Incheon Bridge Co., Ltd. Loan commitments in Korean won 20,000 20,000 Unused lines of credit for credit card 93 98 KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No.2 Purchase of securities 12,550 — Commitments on loss absorption priority 10,000 14,980 SY Auto Capital Co., Ltd. Loan commitments in Korean won 8,100 — Unused lines of credit for credit card 60 90 Food Factory Co., Ltd. Loan commitments in Korean won — 388 Unused lines of credit for credit card 25 73 KB No.17 Special Purpose Acquisition Company Unused lines of credit for credit card — 441 KB No.18 Special Purpose Acquisition Company Unused lines of credit for credit card 15 15 KB No.19 Special Purpose Acquisition Company Unused lines of credit for credit card 1 — CellinCells Co., Ltd. Unused lines of credit for credit card 20 — RAND Bio Science Co., Ltd. Unused lines of credit for credit card 24 24 Big Dipper Co., Ltd. Unused lines of credit for credit card 89 96 Fabric Time Co., Ltd. Unused lines of credit for credit card — 7 KB Pre IPO Secondary Venture Fund No.1 Commitments on loss absorption priority 1,671 1,671 POSCO-KB Purchase of securities 5,000 — KB-TS Purchase of securities 5,936 3,696 KB-SJ Purchase of securities 2,000 500 KB-Brain Scale-up Purchase of securities 18,000 10,000 KB SPROTT Renewable Private Equity Fund No.1 Purchase of securities 22,833 18,704 KB-Stonebridge Purchase of securities 27,930 18,837 KB Social Impact Investment Fund Purchase of securities 3,000 1,500 BNF Corporation Ltd.* Loan commitments in Korean won 360 — APRO Co., Ltd.* Unused lines of credit for credit card 96 — KB-UTC Purchase of securities 22,050 5,085 KB-NAU Purchase of securities — 24,300 All Together Korea Fund No.2 Purchase of securities — 990,000 FineKB Private Equity Fund No.1 Purchase of securities — 25,000 KB-Solidus Purchase of securities 24,700 2,120 RMGP Bio-Pharma Purchase of securities USD 8,911,002 USD 7,796,423 RMGP Bio-Pharma Purchase of securities USD 13,150 USD 17,132 KB-MDI Purchase of securities — USD 13,537,500 Key management Loan commitments in Korean won 1,695 1,760 * Excluded from the Group’s related party as of December 31, 2020.
Schedule Of Key Management Personnel Compensation Table Text Block [Text Block]	Details of compensation to key management for the years ended December 31, 2018, 2019 and 2020, are as follows: 2018 Short-term Post-employment Share-based Total (In millions of Korean won) Registered directors (executive) ￦ 7,757 ￦ 418 ￦ 4,213 ￦ 12,388 Registered directors (non-executive) 960 — — 960 Non-registered 7,135 273 3,314 10,722 ￦ 15,852 ￦ 691 ￦ 7,527 ￦ 24,070 2019 Short-term Post-employment Share-based Total (In millions of Korean won) Registered directors (executive) ￦ 8,540 ￦ 425 ￦ 7,434 ￦ 16,399 Registered directors (non-executive) 1,030 — — 1,030 Non-registered 9,157 360 7,510 17,027 ￦ 18,727 ￦ 785 ￦ 14,944 ￦ 34,456 2020 Short-term Post-employment Share-based Total (In millions of Korean won) Registered directors (executive) ￦ 8,111 ￦ 672 ￦ 6,369 ￦ 15,152 Registered directors (non-executive) 1,133 — — 1,133 Non-registered 10,782 396 6,934 18,112 ￦ 20,026 ￦ 1,068 ￦ 13,303 ￦ 34,397
Schedule Of Provision Of Guarantees Or Collateral By Entity Related Party Transactions Table Text Block [Text Block]	Details of collateral provided from related parties as of December 31, 2019 and 2020, are as follows: Assets pledged as collateral December 31, 2019 December 31, 2020 (In millions of Korean won) Associates KB Star Office Private Real Estate Investment Trust No.1 Real estate ￦ 13,000 ￦ 13,000 Key management Time deposits and others 192 213 Real estate 2,922 4,356 As of December 31, 2020, Incheon Bridge Co., Ltd., a related party, provides fund management account, civil engineering works insurance, and management and operations rights as senior collateral amounting to ￦ 611,000 million to the project financing group that consists of the Group and 5 other institutions, and as subordinated collateral amounting to ￦ 384,800 million to subordinated debt holders that consist of the Group and 2 other institutions. Also, it provides certificate of credit guarantee amounting to ￦ 400,000 million as collateral to the project financing group that consists of the Group and 5 other institutions.

BusinessCombination(Table)

BusinessCombination(Table)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Business Combinations Abstract [Abstract]
Disclosure of Identifiable assets acquired and liabilities assumed related to Acquisition of Prudential Life Insurance Company of Korea Ltd. [Text Block]	Details of consideration paid, assets acquired and liabilities assumed are as follows: 2020 (In millions of Consideration Cash ￦ 2,299,541 Total consideration transferred 2,299,541 Recognized amounts of identifiable assets acquired and liabilities assumed Cash and due from financial institutions 574,204 Financial assets at fair value through profit or loss 503,853 Financial assets at fair value through other comprehensive income 7,195,958 Securities measured at amortized cost 10,064,300 Loans measured at amortized cost 759,869 Derivatives 389 Property and equipment 178,537 Intangible assets 1 10,382 Other assets 4,931,131 Total assets 24,218,623 Insurance liabilities 2 16,752,888 Derivatives 1,166 Other liabilities 5,019,961 Total liabilities 21,774,015 Total identifiable net assets ￦ 2,444,608 Non-controlling interests — Gain on a bargain purchase 3 145,067 1 Memberships, software, development costs and others were previously held by Prudential Life Insurance Company of Korea Ltd. 2 Separately measured VOBA (Value of Business Acquired) was adjusted by applying an indirect method of intrinsic value to the carrying amount of insurance liabilities of the acquiree. 3 As a result of the business combination, gain on a bargain purchase was recognized as other non-operating
Details of intangible assets recognized as the result of the business combination related to Acquisition of Prudential Life Insurance Company of Korea Ltd. [Text Block]	Details of intangible assets recognized as the result of the business combination are as follows: 2020 (In millions of VOBA 1 ￦ (2,807,162 ) Others 2 10,382 ￦ (2,796,780 ) 1 Negative VOBA was recognized and adjusted in the insurance liability. In accordance with IFRS No.4, an indirect method of intrinsic value is applied to the measurement of VOBA. VOBA is a similar concept to present value of in force business (PVIF) and present value of future profits (PVFP or PVP). The VOBA from intrinsic values is calculated through the actuarial model and cash flows that were originally used to calculate the embedded value of the insurance contracts. 2 Memberships, software, development costs and others were previously held by Prudential Life Insurance Company of Korea Ltd.
Disclosure of Identifiable assets acquired and liabilities assumed related to Acquisition of PRASAC Microfinance Institution Plc [Text Block]	Details of consideration paid, assets acquired and liabilities assumed are as follows: 2020 (In millions of Consideration Cash ￦ 733,976 Total consideration transferred 733,976 Recognized amounts of identifiable assets acquired and liabilities assumed Cash and due from financial institutions 658,865 Loans measured at amortized cost 3,194,211 Financial investments 35 Property and equipment 24,472 Intangible assets 1,821 Current income tax assets 873 Deferred income tax assets 26,330 Other assets 37,325 Total assets 3,943,932 Deposits 2,222,944 Borrowings 1,038,684 Debentures 89,570 Current income tax liabilities 9,238 Deferred income tax liabilities 323 Other liabilities 101,696 Total liabilities 3,462,455 Total identifiable net assets ￦ 481,477 Non-controlling interests 1 144,443 Goodwill 2 396,942 1 Measured at the proportionate share (30%) of the fair value of PRASAC’s net assets as of the acquisition date. 2 As a result of the business combination, there was a goodwill and the Group recognized it as intangible assets in the consolidated statement of financial position.
Details of loans acquired related to Acquisition of PRASAC Microfinance Institution Plc [Text Block]	Details of loans acquired are as follows: 2020 (In millions of Acquiree’s carrying amount of loans ￦ 3,294,798 Present value of contractual cash flows not expected to be paid (100,587 ) Fair value of loans ￦ 3,194,211
Disclosure of Amount of the recognized liabilities and deducted equity in relation to the agreement with shareholders related to Acquisition of PRASAC Microfinance Institution Plc [Text Block]	Amount of the recognized liabilities and deducted equity in relation to the above agreement with shareholders are as follows: 2020 (In millions of Agreement with shareholders (purchase of remaining shares and payment of dividends) Other payables (present value of exercising price of options) ￦ 308,236 Other payables (present value of expected dividends) 102,986 ￦ 411,222 Attributable to ordinary equity holders of the Parent Company (capital surplus) (411,222 )
Disclosure of Identifiable assets acquired and liabilities assumed related to Acquisition of PT Bank Bukopin TBK [Text Block]	Details of consideration paid, assets acquired and liabilities assumed are as follows: 2020 (In millions of Consideration Fair value of existing shares at the time of exchange ￦ 78,446 Cash (=16,360,578,947shares x 190 IDR) 252,722 Total consideration transferred 331,168 Recognized amounts of identifiable assets acquired and liabilities assumed Cash and due from financial institutions 300,424 Financial assets at fair value through profit or loss 3,960 Derivative assets 130 Loans measured at amortized cost 4,256,209 Financial investments 469,625 Property and equipment 280,197 Intangible assets 99,085 Deferred income tax assets 25,350 Assets held for sale 183,642 Other assets 272,775 Total assets 5,891,397 Deposits 4,253,557 Borrowings 838,142 Debentures 141,806 Provisions 3,522 Net defined benefit liabilities 15,141 Other liabilities 276,336 Total liabilities 5,528,504 Total identifiable net assets ￦ 362,893 Non-controlling interests 1 120,945 Goodwill 2 89,220 1 The sum of the existing non-controlling interests 2 As a result of the business combination, there was a goodwill and the Group recognized it as intangible assets in the consolidated statement of financial position.
Details of loans acquired related to Acquisition of PT Bank Bukopin TBK [Text Block]	Details of loans acquired are as follows: 2020 (In millions of Acquiree’s carrying amount of loans ￦ 5,053,321 Present value of contractual cash flows not expected to be paid (797,112 ) Fair value of loans ￦ 4,256,209
Details of intangible assets recognized as a result of PT Bank Bukopin TBK business combinations [Text Block]	Details of intangible assets recognized as a result of business combinations are as follows: 2020 (In millions Core deposits 1 ￦ 95,477 Others 2 3,608 ￦ 99,085 1 It is an identifiable intangible asset and reflects the fair value of financing costs saved through stable relationships with saving customers. 2 Software and other intangible assets which were previously held by PT Bank Bukopin TBK.
Disclosure of Identifiable assets acquired and liabilities assumed related to Acquisition of PT. Finansia Multi Finance [Text Block]	Details of consideration paid, assets acquired and liabilities assumed are as follows: 2020 (In millions of Consideration Cash ￦ 89,689 Total consideration transferred 89,689 Recognized amounts of identifiable assets acquired and liabilities assumed Cash and due from financial institutions 24,150 Loans measured at amortized cost 191,039 Property and equipment 13,837 Intangible assets 13,409 Other assets 17,587 Total assets 260,022 Borrowings 146,588 Debentures 46,865 Other liabilities 19,233 Total liabilities 212,686 Total identifiable net assets ￦ 47,336 Non-controlling interests 1 9,467 Goodwill 2 51,820 1 Measured at the proportionate share (20%) of the fair value of PT. Finansia Multi Finance’s net assets as of the acquisition date. 2 As a result of the business combination, there was a goodwill and the Group recognized it as intangible assets in the consolidated statement of financial position.

Parent Company Information(Tabl

Parent Company Information(Table)	12 Months Ended
	Dec. 31, 2020
Condensed financial information of parent company only disclosure [Abstract]
Schedule Of Condensed Balance Sheet [Text Block]	Condensed Statements of Financial Position December 31, December 31, (In millions of Korean won) Assets Cash and due from financial institutions ￦ 18,537 ￦ 23,084 Financial assets at fair value through profit or loss 413,909 474,262 Loans at amortized cost 120,000 179,542 Investments in subsidiaries* Banking subsidiaries 14,821,721 14,821,721 Nonbanking subsidiaries. 9,340,395 11,698,159 Other assets 632,074 911,723 Total assets ￦ 25,346,636 ￦ 28,108,491 Liabilities and shareholders’ equity Borrowings ￦ — ￦ 100,000 Debentures 5,543,446 6,128,043 Other liabilities 621,291 894,828 Shareholders’ equity 19,181,899 20,985,620 Total liabilities and shareholders’ equity ￦ 25,346,636 ￦ 28,108,491 * Investments in subsidiaries were accounted at cost method in accordance with IAS No.27.
Condensed StatementOf ComprehensiveIncome [Text Block]	Condensed Statements of Comprehensive Income 2018 2019 2020 (In millions of Korean won) Income Dividends from subsidiaries ￦ 1,089,556 ￦ 926,934 ￦ 1,573,411 Interest from subsidiaries 5,710 3,618 3,519 Other income 20,940 22,709 22,749 Total income 1,116,206 953,261 1,599,679 Expense Interest expense 122,451 126,065 132,437 Non-interest 65,027 80,355 87,876 Total expense 187,478 206,420 220,313 Profit before income tax expense 928,728 746,841 1,379,366 Income tax benefit (expense) (2,823 ) (854 ) 49 Profit for the year 925,905 745,987 1,379,415 Other comprehensive loss for the year, net of tax (1,911 ) (520 ) (368 ) Total comprehensive income for the year ￦ 923,994 ￦ 745,467 ￦ 1,379,047 * The condensed statements of comprehensive income for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS No.16, and the comparatives for the year ended December 31, 2018 has not been restated.
Schedule Of Condensed Cash Flow Statement [Text Block]	Condensed Statements of Cash Flows 2018 2019 2020 (In millions of Korean won) Operating activities Net income ￦ 925,905 ￦ 745,987 ￦ 1,379,415 Reconciliation of net income (loss) to net cash provided by operating activities: Other operating activities, net (1,243 ) (274 ) 9,930 Net cash inflow from operating activities 924,662 745,713 1,389,345 Investing activities Net payments to subsidiaries — (100,000 ) (2,347,543 ) Other investing activities, net (43,554 ) (200,609 ) (146,477 ) Net cash outflow from investing activities (43,554 ) (300,609 ) (2,494,020 ) Financing activities Net decrease in borrowings (164 ) (298,321 ) 100,000 Increases in debentures 897,872 1,037,656 1,537,091 Repayments of debentures and lease liabilities (688,486 ) (868,723 ) (940,610 ) Issuance of hybrid securities — 399,085 1,296,693 Cash dividends paid (766,728 ) (766,249 ) (883,952 ) Acquisition of treasury shares (224,700 ) (274,317 ) — Net cash inflow (outflow) from financing activities (782,206 ) (770,869 ) 1,109,222 Net increase(decrease) in cash and cash equivalents 98,902 (325,765 ) 4,547 Cash and cash equivalents at January 1 245,397 344,299 18,534 Cash and cash equivalents at December 31 ￦ 344,299 ￦ 18,534 ￦ 23,081 * The condensed statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS No.16, and the comparatives for the year ended December 31, 2018 has not been restated.

The Parent Company_Entity Infor

The Parent Company_Entity Information(Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)shares	Dec. 31, 2019KRW (₩)shares	Dec. 31, 2020USD ($)shares
Entity Information Abstract [Abstract]
Name Of Reporting Entity Or Other Means Of Identification	KB Financial Group Inc.	KB Financial Group Inc.
Description Of Nature Of Entitys Operations And Principal Activities	KB Financial Group Inc. (the "Parent Company") was incorporated on September 29, 2008, under the Financial Holding Companies Act of Korea. KB Financial Group Inc. and its subsidiaries (the "Group") derive substantially all of their revenue and income from providing a broad range of banking and related financial services to consumers and corporations primarily in Korea and in selected international markets. The Parent Company's principal business includes ownership and management of subsidiaries and associated companies that are engaged in financial services or activities	KB Financial Group Inc. (the "Parent Company") was incorporated on September 29, 2008, under the Financial Holding Companies Act of Korea. KB Financial Group Inc. and its subsidiaries (the "Group") derive substantially all of their revenue and income from providing a broad range of banking and related financial services to consumers and corporations primarily in Korea and in selected international markets. The Parent Company's principal business includes ownership and management of subsidiaries and associated companies that are engaged in financial services or activities
Issued Capital	₩ 2,090,558	₩ 2,090,558	$ 1,924,812
Number Of Shares Authorised	1,000,000,000	1,000,000,000	1,000,000,000

Significant basis of preparatio

Significant basis of preparation and accounting policies_Newly adopted standards and interpretations that affected the Groups accounting policies(Details)	12 Months Ended
	Dec. 31, 2020
Amendments to Korean IFRS No.1001 Presentation of Financial Statements and Korean IFRS No.1008 Accounting policies, changes in accounting estimates and errors
Disclosure of initial application of standards or interpretations [Line Items]
Title of initially applied IFRS	Korean IFRS No.1001 Presentation of Financial Statements and Korean IFRS No.1008 Accounting policies, changes in accounting estimates and errors
Description of nature of change in accounting policy	The amendments clarify the definition of material. Information is material if omitting, misstating or obscuring it could reasonably be expected to influence the decisions that the primary users of general-purpose financial statements make on the basis of those financial statements.
Description of fact that impact of initial application of new IFRS is not known or reasonably estimable	These amendments do not have a significant impact on the consolidated financial statements.
Amendments to Korean IFRS 1103 Business Combination
Disclosure of initial application of standards or interpretations [Line Items]
Title of initially applied IFRS	Amendments to Korean IFRS No.1103 Business Combination
Description of nature of change in accounting policy	The amended definition of a business requires an acquisition to include an input and a substantive process that together significantly contribute to the ability to create outputs and the definition of output excludes the returns in the form of lower costs and other economic benefits. If substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, an entity may elect to apply an optional concentration test that permits a simplified assessment of whether an acquired set of activities and assets is not a business. These amendments do not have a significant impact on the consolidated financial statements.
Description of fact that impact of initial application of new IFRS is not known or reasonably estimable	These amendments may have impact on the consolidated financial statements if business combination occurs in the future.
Amendments to Korean IFRS 1107 Financial Instruments: Disclosure
Disclosure of initial application of standards or interpretations [Line Items]
Title of initially applied IFRS	Korean IFRS 1107 Financial Instruments
Description of nature of change in accounting policy	These amendments provide exceptions applying hedge accounting even though interest rate benchmark reform gives rise to uncertainties. In the hedging relationship, an entity shall assume that the interest rate benchmark on which the hedge cash flows are based is not altered as a result of interest rate benchmark reform when determining whether a forecast transaction is highly probable and prospectively assessing hedging effectiveness. For a hedge of a non-contractually specified benchmark component of interest rate risk, an entity shall apply the requirement that the risk component shall be separately identifiable only at the inception of the hedging relationship. The application of this exception is ceased either when the uncertainty arising from interest rate benchmark reform is no longer present with respect to the timing and the amount of the interest rate benchmark-based cash flows of the hedge item, or when the hedging relationship that the hedge item is part of is discontinued. The Group early adopted these amendments since 2019 as the amendments allow the early adoption.
Description of fact that impact of initial application of new IFRS is not known or reasonably estimable	The significant benchmark interest rate indicators for the hedge relationship are LIBOR and CD, and those affected by these amendments should be referred to Note 9.

Basis Of Preparation_Basis Of P

Basis Of Preparation_Basis Of Preparation Of Financial Statements(Details)	12 Months Ended
	Dec. 31, 2020
Deferred Tax Assets
Disclosure Of Assets And Liabilities With Significant Risk Of Material Adjustment Line Items [Line Items]
Description Of Nature Of Assets With Significant Risk Of Material Adjustments Within Next Financial Year	The Group is operating in numerous countries and the income generated from these operations is subject to income taxes based on tax laws and interpretations of tax authorities in numerous jurisdictions. There are many transactions and calculations for which the ultimate tax determination is uncertain. If certain portion of the taxable income is not used for investments, wages, etc. in accordance with the Korean regulation called 'Special Taxation for Facilitation of Investment and Mutually-beneficial Cooperation', the Group is liable to pay additional income tax calculated based on the tax laws. Therefore, the effect of recirculation of corporate income should be reflected in current and deferred income tax. As the Group's income tax is dependent on the actual investments, wages, etc. per each year, there are uncertainties with regard to measuring the final tax effects during the period when the tax law is applied.
Fair Value Of Financial Instruments
Disclosure Of Assets And Liabilities With Significant Risk Of Material Adjustment Line Items [Line Items]
Description Of Nature Of Assets With Significant Risk Of Material Adjustments Within Next Financial Year	The fair value of financial instruments where no active market exists or where quoted prices are not otherwise available is determined by using valuation techniques. Financial instruments, which are not actively traded in the market and those with less transparent market prices, will have less objective fair values and require broad judgment on liquidity, concentration, uncertainty in market factors and assumptions in fair value determination and other risks. As described in the significant accounting policies in Note 3.3, 'Recognition and Measurement of Financial Instruments', diverse valuation techniques are used to determine the fair value of financial instruments, from generally accepted market valuation models to internally developed valuation models that incorporate various types of assumptions and variables.
Allowances and provisions for credit losses
Disclosure Of Assets And Liabilities With Significant Risk Of Material Adjustment Line Items [Line Items]
Description Of Nature Of Liabilities With Significant Risk Of Material Adjustments Within Next Financial Year	The Group recognizes and measures allowances for credit losses of debt instruments measured at amortized cost, debt instruments measured at fair value through other comprehensive income, and lease receivables. Also, the Group recognizes and measures provisions for credit losses of acceptances and guarantees, and unused loan commitments. Accuracy of allowances and provisions for credit losses is dependent upon estimation of expected cash flows of the borrower for individually assessed loans, and upon assumptions and methodology used for collectively assessed groups of loans, acceptances and guarantees and unused loan commitments.
Net defined benefit liabilities
Disclosure Of Assets And Liabilities With Significant Risk Of Material Adjustment Line Items [Line Items]
Description Of Nature Of Liabilities With Significant Risk Of Material Adjustments Within Next Financial Year	The present value of the net defined benefit liability is affected by changes in the various factors determined by the actuarial method.
Goodwill
Disclosure Of Assets And Liabilities With Significant Risk Of Material Adjustment Line Items [Line Items]
Description Of Nature Of Assets With Significant Risk Of Material Adjustments Within Next Financial Year	The recoverable amounts of cash-generating units are determined based on value-in-use calculations to test whether impairment of goodwill has occurred.
Estimated claims for Incurred But Not Reported ("IBNR")
Disclosure Of Assets And Liabilities With Significant Risk Of Material Adjustment Line Items [Line Items]
Description Of Nature Of Liabilities With Significant Risk Of Material Adjustments Within Next Financial Year	An amount of IBNR is the total sum of estimated insurance claims that shall be paid for accidents that occurred but have not been reported to the Group and the estimated amount of insurance proceeds that shall be additionally paid upon resumption of payment claims. The Group calculates IBNR by applying statistical methods in risk units designated in Detailed Regulations on Supervision of Insurance Business, and records IBNR in reserve for outstanding claims of insurance liability. IBNR based on statistical methods requires significant accounting estimates in determining appropriate model applied by accident year (PLDM, ILDM, BFM, and others) and development parameters.
Assessment of expected credit losses of financial instruments related to COVID-19
Disclosure Of Assets And Liabilities With Significant Risk Of Material Adjustment Line Items [Line Items]
Description Of Nature Of Assets With Significant Risk Of Material Adjustments Within Next Financial Year	The proliferation of COVID-19 in 2020 negatively affected the global economy, despite of various forms of government support policy. Accordingly, the Group was provided with various economic forecasting scenarios from KB Research, assuming macroeconomic changes due to the level of COVID-19 pandemic. The Group reviewed the possibilities of each scenario comprehensively, updated the forward-looking information, and reflected its effect on expected credit losses through the statistical method. In order to reflect additional credit risk for financial assets whose industries are highly affected by COVID-19, the Group measured expected credit losses using a conservative scenario comparing to the forecasted forward-looking information and proactively responded to the credit risk to be increased in the future by expanding the scope of loans subject to lifetime expected credit losses (non-impaired) and expanding the scope of loans subject to individual assessment. The Group will continue to monitor the impact of COVID-19 on the expected credit losses by comprehensively considering the duration of the impact on the entire economy and the government's policies.

Significant Accounting Polici_4

Significant Accounting Policies_Significant Accounting Policies_The Correlation Between The Major Macroeconomic Variables And The Credit Risk(Details)	12 Months Ended
	Dec. 31, 2020
Domestic GDP Growth Rate
Disclosure Of Correlation Between The Major Macroeconomic Variables And The Credit Risk [Line Items]
Correlation Between The Major Macroeconomic Variables And The Credit Risk	Negative correlation
Composite Stock Index
Disclosure Of Correlation Between The Major Macroeconomic Variables And The Credit Risk [Line Items]
Correlation Between The Major Macroeconomic Variables And The Credit Risk	Negative correlation
Construction Investment Change Rate
Disclosure Of Correlation Between The Major Macroeconomic Variables And The Credit Risk [Line Items]
Correlation Between The Major Macroeconomic Variables And The Credit Risk	Negative correlation
Rate Of Change In Housing Transaction Price Index
Disclosure Of Correlation Between The Major Macroeconomic Variables And The Credit Risk [Line Items]
Correlation Between The Major Macroeconomic Variables And The Credit Risk	Negative correlation
Interest Rate Spread
Disclosure Of Correlation Between The Major Macroeconomic Variables And The Credit Risk [Line Items]
Correlation Between The Major Macroeconomic Variables And The Credit Risk	Positive correlation
Private Consumption Growth Rate
Disclosure Of Correlation Between The Major Macroeconomic Variables And The Credit Risk [Line Items]
Correlation Between The Major Macroeconomic Variables And The Credit Risk	Negative correlation
Change Of Call Rate Compared To The Previous Year (%P)
Disclosure Of Correlation Between The Major Macroeconomic Variables And The Credit Risk [Line Items]
Correlation Between The Major Macroeconomic Variables And The Credit Risk	Positive correlation
Household Loan Change Rate
Disclosure Of Correlation Between The Major Macroeconomic Variables And The Credit Risk [Line Items]
Correlation Between The Major Macroeconomic Variables And The Credit Risk	Negative correlation

Significant Accounting Polici_5

Significant Accounting Policies_Property Equipment And Investment Properties And Intangible Assets(Details)	12 Months Ended
	Dec. 31, 2020
Buildings Investment Property Member [Member]
Disclosure Of Investment Property Line Items [Line Items]
Depreciation Method Investment Property Cost Model	Straight-line
Description Of Useful Life Investment Property Cost Model	20~40 years
Buildings
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Depreciation Method Property Plant And Equipment	Straight-line
Description Of Useful Life Property Plant And Equipment	20 ~ 40 years
Leasehold improvements
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Depreciation Method Property Plant And Equipment	Declining-balance/ Straight-line
Description Of Useful Life Property Plant And Equipment	4 ~ 15 years
Equipment and vehicles
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Depreciation Method Property Plant And Equipment	Declining-balance/ Straight-line
Description Of Useful Life Property Plant And Equipment	3 ~ 15 years
Industrial property rights
Disclosure Of Intangible Assets Line Items [Line Items]
Amortisation Method Intangible Assets Other Than Goodwill	Straight-line
Description of useful life, intangible assets other than goodwill	3 ~ 19 years
Software
Disclosure Of Intangible Assets Line Items [Line Items]
Amortisation Method Intangible Assets Other Than Goodwill	Straight-line
Description of useful life, intangible assets other than goodwill	3~5 years
Value of Business Acquired (VOBA)
Disclosure Of Intangible Assets Line Items [Line Items]
Amortisation Method Intangible Assets Other Than Goodwill	Declining-Balance
Description of useful life, intangible assets other than goodwill	30, 60 years
Others
Disclosure Of Intangible Assets Line Items [Line Items]
Amortisation Method Intangible Assets Other Than Goodwill	Straight-line / Declining-balance
Description of useful life, intangible assets other than goodwill	1~13 years

Financial Risk Management_Maxim

Financial Risk Management_Maximum Exposure To Credit Risk(Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		₩ 746,811,197	₩ 654,860,994
Financial assets
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		574,163,818	490,888,495
Due from financial institutions measured at amortized cost
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk	[1]	22,720,091	18,142,960
Due from financial institutions measured at fair value through profit or loss
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		100,094	216,367
Securities measured at fair value through profit or loss
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		58,415,100	50,721,526
Loans measured at fair value through profit or loss
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		337,983	427,545
Financial instruments indexed to the price of gold
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		89,965	79,805
Derivatives
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		5,545,385	3,190,673
Loans measured at amortized cost
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk	[1]	377,166,984	339,684,059
Securities measured at fair value through other comprehensive income
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		58,456,889	43,556,848
Securities measured at amortized cost
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk	[1]	36,870,229	25,346,555
Loans measured at fair value through other comprehensive income
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		293,409	375,098
Other financial assets
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk	[1]	14,167,689	9,147,059
Off-balance sheet items
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		172,647,379	163,972,499
Acceptances And Guarantees Contracts
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		8,548,928	8,327,494
Financial guarantee contracts
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		4,964,468	3,847,390
Commitments
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum Exposure To Credit Risk		₩ 159,133,983	₩ 151,797,615
[1]	After netting of allowance.

Financial Risk Management_The C

Financial Risk Management_The Credit Quality Of Loans(Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		₩ 380,743,758	₩ 342,467,174
Loans measured at amortized cost
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	380,450,349	342,092,076
Corporate
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	175,952,265	156,654,544
Corporate | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	97,687,154	86,462,605
Corporate | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	68,769,764	62,748,306
Corporate | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	5,212,879	4,842,055
Corporate | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	1,706,009	1,423,099
Corporate | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	2,576,459	1,178,479
Retail
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	185,700,454	166,789,122
Retail | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	166,804,091	149,884,900
Retail | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	13,060,750	11,544,982
Retail | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	3,850,894	3,633,703
Retail | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	636,495	582,614
Retail | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	1,348,224	1,142,923
Credit card
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	18,797,630	18,648,410
Credit card | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	8,623,095	8,486,229
Credit card | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	6,540,030	6,414,134
Credit card | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	2,742,816	2,720,395
Credit card | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	264,219	417,345
Credit card | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	627,470	610,307
Loans measured at fair value through other comprehensive income
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		293,409	375,098
Corporate
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		293,409	375,098
Corporate | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		235,469	241,524
Corporate | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		57,940	133,574
Corporate | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Corporate | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Corporate | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
12-month expected credit losses
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		348,821,470	316,752,109
12-month expected credit losses | Loans measured at amortized cost
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	348,528,061	316,377,011
12-month expected credit losses | Corporate
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	158,067,246	145,082,471
12-month expected credit losses | Corporate | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	93,033,311	83,839,707
12-month expected credit losses | Corporate | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	61,701,031	58,057,809
12-month expected credit losses | Corporate | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	2,702,369	2,650,199
12-month expected credit losses | Corporate | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	611,743	518,108
12-month expected credit losses | Corporate | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	18,792	16,648
12-month expected credit losses | Retail
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	174,873,189	155,623,541
12-month expected credit losses | Retail | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	163,261,012	146,265,744
12-month expected credit losses | Retail | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	8,828,445	7,081,846
12-month expected credit losses | Retail | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	2,519,004	2,080,690
12-month expected credit losses | Retail | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	225,262	185,081
12-month expected credit losses | Retail | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	39,466	10,180
12-month expected credit losses | Credit card
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	15,587,626	15,670,999
12-month expected credit losses | Credit card | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	8,210,540	8,390,177
12-month expected credit losses | Credit card | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	5,831,625	5,695,069
12-month expected credit losses | Credit card | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	1,526,382	1,558,999
12-month expected credit losses | Credit card | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	16,978	26,404
12-month expected credit losses | Credit card | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	2,101	350
12-month expected credit losses | Loans measured at fair value through other comprehensive income
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		293,409	375,098
12-month expected credit losses | Corporate
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		293,409	375,098
12-month expected credit losses | Corporate | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		235,469	241,524
12-month expected credit losses | Corporate | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		57,940	133,574
12-month expected credit losses | Corporate | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
12-month expected credit losses | Corporate | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
12-month expected credit losses | Corporate | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Non-impaired
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		28,495,172	23,814,107
Non-impaired | Loans measured at amortized cost
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	28,495,172	23,814,107
Non-impaired | Corporate
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	15,695,811	10,749,284
Non-impaired | Corporate | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	4,646,801	2,621,898
Non-impaired | Corporate | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	7,060,916	4,683,445
Non-impaired | Corporate | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	2,507,455	2,187,662
Non-impaired | Corporate | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	1,085,704	900,386
Non-impaired | Corporate | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	394,935	355,893
Non-impaired | Retail
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	10,095,819	10,561,739
Non-impaired | Retail | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	3,536,290	3,611,001
Non-impaired | Retail | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	4,197,409	4,433,832
Non-impaired | Retail | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	1,322,878	1,541,647
Non-impaired | Retail | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	402,881	387,811
Non-impaired | Retail | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	636,361	587,448
Non-impaired | Credit card
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	2,703,542	2,503,084
Non-impaired | Credit card | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	412,555	96,052
Non-impaired | Credit card | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	708,405	719,065
Non-impaired | Credit card | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	1,216,434	1,161,396
Non-impaired | Credit card | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	247,241	390,941
Non-impaired | Credit card | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	118,907	135,630
Non-impaired | Loans measured at fair value through other comprehensive income
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Non-impaired | Corporate
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Non-impaired | Corporate | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Non-impaired | Corporate | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Non-impaired | Corporate | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Non-impaired | Corporate | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Non-impaired | Corporate | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Impaired
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		3,427,116	1,900,958
Impaired | Loans measured at amortized cost
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	3,427,116	1,900,958
Impaired | Corporate
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	2,189,208	822,789
Impaired | Corporate | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	7,042	1,000
Impaired | Corporate | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	7,817	7,052
Impaired | Corporate | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	3,055	4,194
Impaired | Corporate | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	8,562	4,605
Impaired | Corporate | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	2,162,732	805,938
Impaired | Retail
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	731,446	603,842
Impaired | Retail | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	6,789	8,155
Impaired | Retail | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	34,896	29,304
Impaired | Retail | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	9,012	11,366
Impaired | Retail | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	8,352	9,722
Impaired | Retail | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	672,397	545,295
Impaired | Credit card
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	506,462	474,327
Impaired | Credit card | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Impaired | Credit card | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Impaired | Credit card | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Impaired | Credit card | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Impaired | Credit card | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	506,462	474,327
Impaired | Loans measured at fair value through other comprehensive income
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Impaired | Corporate
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Impaired | Corporate | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Impaired | Corporate | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Impaired | Corporate | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Impaired | Corporate | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Impaired | Corporate | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Not applying expected credit losses
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Not applying expected credit losses | Loans measured at amortized cost
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Corporate
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Corporate | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Corporate | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Corporate | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Corporate | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Corporate | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Retail
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Retail | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Retail | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Retail | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Retail | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Retail | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Credit card
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Credit card | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Credit card | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Credit card | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Credit card | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Credit card | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables	[1]	0	0
Not applying expected credit losses | Loans measured at fair value through other comprehensive income
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Not applying expected credit losses | Corporate
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Not applying expected credit losses | Corporate | Grade 1
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Not applying expected credit losses | Corporate | Grade 2
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Not applying expected credit losses | Corporate | Grade 3
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Not applying expected credit losses | Corporate | Grade 4
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		0	0
Not applying expected credit losses | Corporate | Grade 5
Disclosure Of Financial Instruments Line Items [Line Items]
Maximum exposure to credit risk of loans or receivables		₩ 0	₩ 0
[1]	Before netting of allowance

Financial Risk Management_Credi

Financial Risk Management_Credit Quality Of Loans Graded According To Internal Credit Ratings(Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Grade 1 | Bottom Of Range Member [Member]
Probability Of Default Line Items [Line Items]
Range of Probability of Default (%)	0.00%	0.00%
Grade 1 | Top Of Range Member [Member]
Probability Of Default Line Items [Line Items]
Range of Probability of Default (%)	1.00%	1.00%
Grade 2 | Bottom Of Range Member [Member]
Probability Of Default Line Items [Line Items]
Range of Probability of Default (%)	1.00%	1.00%
Grade 2 | Top Of Range Member [Member]
Probability Of Default Line Items [Line Items]
Range of Probability of Default (%)	5.00%	5.00%
Grade 3 | Bottom Of Range Member [Member]
Probability Of Default Line Items [Line Items]
Range of Probability of Default (%)	5.00%	5.00%
Grade 3 | Top Of Range Member [Member]
Probability Of Default Line Items [Line Items]
Range of Probability of Default (%)	15.00%	15.00%
Grade 4 | Bottom Of Range Member [Member]
Probability Of Default Line Items [Line Items]
Range of Probability of Default (%)	15.00%	15.00%
Grade 4 | Top Of Range Member [Member]
Probability Of Default Line Items [Line Items]
Range of Probability of Default (%)	30.00%	30.00%
Grade 5 | Bottom Of Range Member [Member]
Probability Of Default Line Items [Line Items]
Range of Probability of Default (%)	30.00%	30.00%
Retail | Grade 1
Credit Quality Of Loans Line Item [Line Items]
Credit Quality Of Loans	1 ~ 5 grade	1 ~ 5 grade
Retail | Grade 2
Credit Quality Of Loans Line Item [Line Items]
Credit Quality Of Loans	6 ~ 8 grade	6 ~ 8 grade
Retail | Grade 3
Credit Quality Of Loans Line Item [Line Items]
Credit Quality Of Loans	9 ~ 10 grade	9 ~ 10 grade
Retail | Grade 4
Credit Quality Of Loans Line Item [Line Items]
Credit Quality Of Loans	11 grade	11 grade
Retail | Grade 5
Credit Quality Of Loans Line Item [Line Items]
Credit Quality Of Loans	12 grade or under	12 grade or under
Corporate | Grade 1
Credit Quality Of Loans Line Item [Line Items]
Credit Quality Of Loans	AAA ~ BBB+	AAA ~ BBB+
Corporate | Grade 2
Credit Quality Of Loans Line Item [Line Items]
Credit Quality Of Loans	BBB ~ BB	BBB ~ BB
Corporate | Grade 3
Credit Quality Of Loans Line Item [Line Items]
Credit Quality Of Loans	BB- ~ B	BB- ~ B
Corporate | Grade 4
Credit Quality Of Loans Line Item [Line Items]
Credit Quality Of Loans	B- ~ CCC	B- ~ CCC
Corporate | Grade 5
Credit Quality Of Loans Line Item [Line Items]
Credit Quality Of Loans	CC or under	CC or under

Financial Risk Management_The Q

Financial Risk Management_The Quantification Of The Extent To Which Collateral And Other Credit Enhancements Mitigate Credit Risk For Loans(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
12-month expected credit losses
Assets Held As Collateral Permitted To Be Sold Or Repledged At Fair Value Line Items [Line Items]
Guarantees	₩ 79,088,720	₩ 70,183,658
Deposits and savings	5,210,681	4,478,032
Property and equipment	11,607,675	10,014,552
Real estate	170,171,707	155,769,901
Total	266,078,783	240,446,143
Lifetime expected credit losses
Assets Held As Collateral Permitted To Be Sold Or Repledged At Fair Value Line Items [Line Items]
Guarantees	85,009,046	74,203,219
Deposits and savings	5,427,473	4,604,287
Property and equipment	12,536,622	10,652,071
Real estate	184,844,858	167,027,311
Total	287,817,999	256,486,888
Non-impaired
Assets Held As Collateral Permitted To Be Sold Or Repledged At Fair Value Line Items [Line Items]
Guarantees	5,732,814	3,839,736
Deposits and savings	149,745	118,221
Property and equipment	808,476	582,109
Real estate	12,836,286	10,839,595
Total	19,527,321	15,379,661
Impaired
Assets Held As Collateral Permitted To Be Sold Or Repledged At Fair Value Line Items [Line Items]
Guarantees	187,512	179,825
Deposits and savings	67,047	8,034
Property and equipment	120,471	55,410
Real estate	1,836,865	417,815
Total	₩ 2,211,895	₩ 661,084

Financial Risk Management_The_2

Financial Risk Management_The Credit Quality Of Securities Excluding Equity Securities(Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		₩ 95,330,067	₩ 68,905,075
Securities measured at amortized cost
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	36,873,178	25,348,227
Securities measured at amortized cost | Grade 1
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	36,467,719	25,147,636
Securities measured at amortized cost | Grade 2
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	359,551	157,881
Securities measured at amortized cost | Grade 3
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	45,908	42,710
Securities measured at amortized cost | Grade 4
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Securities measured at amortized cost | Grade 5
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Securities measured at fair value through other comprehensive income
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		58,456,889	43,556,848
Securities measured at fair value through other comprehensive income | Grade 1
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		54,576,777	40,206,856
Securities measured at fair value through other comprehensive income | Grade 2
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		3,746,200	3,337,327
Securities measured at fair value through other comprehensive income | Grade 3
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		126,391	12,665
Securities measured at fair value through other comprehensive income | Grade 4
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		7,521	0
Securities measured at fair value through other comprehensive income | Grade 5
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
12-month expected credit losses
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		95,323,006	68,905,075
12-month expected credit losses | Securities measured at amortized cost
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	36,866,117	25,348,227
12-month expected credit losses | Securities measured at amortized cost | Grade 1
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	36,467,719	25,147,636
12-month expected credit losses | Securities measured at amortized cost | Grade 2
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	359,551	157,881
12-month expected credit losses | Securities measured at amortized cost | Grade 3
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	38,847	42,710
12-month expected credit losses | Securities measured at amortized cost | Grade 4
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
12-month expected credit losses | Securities measured at amortized cost | Grade 5
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
12-month expected credit losses | Securities measured at fair value through other comprehensive income
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		58,456,889	43,556,848
12-month expected credit losses | Securities measured at fair value through other comprehensive income | Grade 1
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		54,576,777	40,206,856
12-month expected credit losses | Securities measured at fair value through other comprehensive income | Grade 2
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		3,746,200	3,337,327
12-month expected credit losses | Securities measured at fair value through other comprehensive income | Grade 3
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		126,391	12,665
12-month expected credit losses | Securities measured at fair value through other comprehensive income | Grade 4
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		7,521	0
12-month expected credit losses | Securities measured at fair value through other comprehensive income | Grade 5
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Non-impaired
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		7,061	0
Non-impaired | Securities measured at amortized cost
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	7,061	0
Non-impaired | Securities measured at amortized cost | Grade 1
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Non-impaired | Securities measured at amortized cost | Grade 2
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Non-impaired | Securities measured at amortized cost | Grade 3
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	7,061	0
Non-impaired | Securities measured at amortized cost | Grade 4
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Non-impaired | Securities measured at amortized cost | Grade 5
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Non-impaired | Securities measured at fair value through other comprehensive income
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Non-impaired | Securities measured at fair value through other comprehensive income | Grade 1
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Non-impaired | Securities measured at fair value through other comprehensive income | Grade 2
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Non-impaired | Securities measured at fair value through other comprehensive income | Grade 3
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Non-impaired | Securities measured at fair value through other comprehensive income | Grade 4
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Non-impaired | Securities measured at fair value through other comprehensive income | Grade 5
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Impaired
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Impaired | Securities measured at amortized cost
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Impaired | Securities measured at amortized cost | Grade 1
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Impaired | Securities measured at amortized cost | Grade 2
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Impaired | Securities measured at amortized cost | Grade 3
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Impaired | Securities measured at amortized cost | Grade 4
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Impaired | Securities measured at amortized cost | Grade 5
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Impaired | Securities measured at fair value through other comprehensive income
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Impaired | Securities measured at fair value through other comprehensive income | Grade 1
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Impaired | Securities measured at fair value through other comprehensive income | Grade 2
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Impaired | Securities measured at fair value through other comprehensive income | Grade 3
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Impaired | Securities measured at fair value through other comprehensive income | Grade 4
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Impaired | Securities measured at fair value through other comprehensive income | Grade 5
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Not applying expected credit losses
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Not applying expected credit losses | Securities measured at amortized cost
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Not applying expected credit losses | Securities measured at amortized cost | Grade 1
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Not applying expected credit losses | Securities measured at amortized cost | Grade 2
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Not applying expected credit losses | Securities measured at amortized cost | Grade 3
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Not applying expected credit losses | Securities measured at amortized cost | Grade 4
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Not applying expected credit losses | Securities measured at amortized cost | Grade 5
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities	[1]	0	0
Not applying expected credit losses | Securities measured at fair value through other comprehensive income
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Not applying expected credit losses | Securities measured at fair value through other comprehensive income | Grade 1
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Not applying expected credit losses | Securities measured at fair value through other comprehensive income | Grade 2
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Not applying expected credit losses | Securities measured at fair value through other comprehensive income | Grade 3
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Not applying expected credit losses | Securities measured at fair value through other comprehensive income | Grade 4
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		0	0
Not applying expected credit losses | Securities measured at fair value through other comprehensive income | Grade 5
Financial Investments Securities Excluding Equity Securities [Line Items]
Financial Investments Securities Excluding Equity Securities		₩ 0	₩ 0
[1]	Before netting of allowance

Financial Risk Management_The_3

Financial Risk Management_The Credit Quality Of Securities Excluding Equity Securities According To The Credit Ratings By External Rating Agencies(Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
KIS | Grade 1 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AA0	AA0
KIS | Grade 1 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AAA	AAA
KIS | Grade 2 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	A-	A-
KIS | Grade 2 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AA-	AA-
KIS | Grade 3 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB0	BBB0
KIS | Grade 3 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB+	BBB+
KIS | Grade 4 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB0	BB0
KIS | Grade 4 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB-	BBB-
KIS | Grade 5 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB-	BB-
NICE P&I | Grade 1 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AA0	AA0
NICE P&I | Grade 1 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AAA	AAA
NICE P&I | Grade 2 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	A-	A-
NICE P&I | Grade 2 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AA-	AA-
NICE P&I | Grade 3 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB0	BBB0
NICE P&I | Grade 3 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB+	BBB+
NICE P&I | Grade 4 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB0	BB0
NICE P&I | Grade 4 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB-	BBB-
NICE P&I | Grade 5 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB-	BB-
KAP | Grade 1 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AA0	AA0
KAP | Grade 1 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AAA	AAA
KAP | Grade 2 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	A-	A-
KAP | Grade 2 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AA-	AA-
KAP | Grade 3 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB0	BBB0
KAP | Grade 3 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB+	BBB+
KAP | Grade 4 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB0	BB0
KAP | Grade 4 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB-	BBB-
KAP | Grade 5 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB-	BB-
FnPricing Inc. | Grade 1 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AA0	AA0
FnPricing Inc. | Grade 1 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AAA	AAA
FnPricing Inc. | Grade 2 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	A-	A-
FnPricing Inc. | Grade 2 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AA-	AA-
FnPricing Inc. | Grade 3 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB0	BBB0
FnPricing Inc. | Grade 3 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB+	BBB+
FnPricing Inc. | Grade 4 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB0	BB0
FnPricing Inc. | Grade 4 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB-	BBB-
FnPricing Inc. | Grade 5 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB-	BB-
S&P | Grade 1 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	A-	A-
S&P | Grade 1 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AAA	AAA
S&P | Grade 2 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB-	BBB-
S&P | Grade 2 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB+	BBB+
S&P | Grade 3 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB	BB
S&P | Grade 3 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB+	BB+
S&P | Grade 4 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	B+	B+
S&P | Grade 4 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB-	BB-
S&P | Grade 5 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	B	B
Fitch-IBCA | Grade 1 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	A-	A-
Fitch-IBCA | Grade 1 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	AAA	AAA
Fitch-IBCA | Grade 2 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB-	BBB-
Fitch-IBCA | Grade 2 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BBB+	BBB+
Fitch-IBCA | Grade 3 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB	BB
Fitch-IBCA | Grade 3 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB+	BB+
Fitch-IBCA | Grade 4 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	B+	B+
Fitch-IBCA | Grade 4 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	BB-	BB-
Fitch-IBCA | Grade 5 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	B	B
Moody's | Grade 1 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	A3	A3
Moody's | Grade 1 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	Aaa	Aaa
Moody's | Grade 2 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	Baa3	Baa3
Moody's | Grade 2 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	Baa1	Baa1
Moody's | Grade 3 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	Ba2	Ba2
Moody's | Grade 3 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	Ba1	Ba1
Moody's | Grade 4 | Bottom Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	B1	B1
Moody's | Grade 4 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	Ba3	Ba3
Moody's | Grade 5 | Top Of Range Member [Member]
Credit Ratings By External Agencies Line Items [Line Items]
Credit Ratings By External Agencies	B2	B2

Financial Risk Management_The_4

Financial Risk Management_The Credit Quality Of Due From Financial Institutions(Details) - Due from financial institutions measured at amortized cost - KRW (₩) ₩ in Millions		Dec. 31, 2020		Dec. 31, 2019
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	₩ 22,723,354	[1]	₩ 18,147,672
Grade 1
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	21,437,207		17,292,966
Grade 2
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	334,371		149,927
Grade 3
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	458,831		677,249
Grade 4
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	479,142		0
Grade 5
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	13,803		27,530
12-month expected credit losses
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	22,709,972		18,134,133
12-month expected credit losses | Grade 1
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	21,437,207		17,292,966
12-month expected credit losses | Grade 2
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	334,371		149,927
12-month expected credit losses | Grade 3
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	445,732		677,249
12-month expected credit losses | Grade 4
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	479,142		0
12-month expected credit losses | Grade 5
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	13,520		13,991
Non-impaired
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	13,099		13,179
Non-impaired | Grade 1
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Non-impaired | Grade 2
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Non-impaired | Grade 3
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	13,099		0
Non-impaired | Grade 4
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Non-impaired | Grade 5
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		13,179
Impaired
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	283		360
Impaired | Grade 1
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Impaired | Grade 2
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Impaired | Grade 3
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Impaired | Grade 4
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Impaired | Grade 5
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	283		360
Not applying expected credit losses
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Not applying expected credit losses | Grade 1
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Not applying expected credit losses | Grade 2
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Not applying expected credit losses | Grade 3
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Not applying expected credit losses | Grade 4
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	0		0
Not applying expected credit losses | Grade 5
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions	[2]	₩ 0		₩ 0
[1]	Amount includes loans measured at fair value through profit or loss, other comprehensive income and amortized cost.
[2]	Before netting of allowance

Financial Risk Management_A Qua

Financial Risk Management_A Quantification Of The Extent To Which Collateral And Other Credit Enhancements Mitigate Credit Risk For Derivatives(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Collateral Mitigate Credit Risk Of Derivative Abstract [Abstract]
Deposits and savings, securities and others	₩ 1,651,322	₩ 802,170

Financial Risk Management_The G

Financial Risk Management_The Groups Regional Loans(Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ 377,798,376	₩ 340,486,702
Korea
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	359,031,298	331,738,893
Europe
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	2,031,838	1,114,248
China
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	4,498,902	3,115,205
Japan
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	922,209	647,562
United States
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	1,940,888	2,324,064
Cambodia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	3,635,434
Indonesia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	4,481,708
Others
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	1,256,099	1,546,730
Loans
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ 381,081,739	₩ 342,894,719
%	[1]	100.00%	100.00%
Loans | Korea
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ 361,465,000	₩ 334,102,225
%	[1]	94.85%	97.44%
Loans | Europe
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ 2,042,979	₩ 1,118,429
%	[1]	0.54%	0.33%
Loans | China
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ 4,519,391	₩ 3,135,859
%	[1]	1.19%	0.91%
Loans | Japan
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ 923,458	₩ 648,138
%	[1]	0.24%	0.19%
Loans | United States
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ 1,962,377	₩ 2,333,269
%	[1]	0.51%	0.68%
Loans | Cambodia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ 3,725,086
%		0.98%
Loans | Indonesia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ 5,181,655
%	[1]	1.36%
Loans | Others
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ 1,261,793	₩ 1,556,799
%	[1]	0.33%	0.45%
Allowances
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ (3,283,363)	₩ (2,408,017)
Allowances | Korea
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	(2,433,702)	(2,363,332)
Allowances | Europe
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	(11,141)	(4,181)
Allowances | China
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	(20,489)	(20,654)
Allowances | Japan
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	(1,249)	(576)
Allowances | United States
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	(21,489)	(9,205)
Allowances | Cambodia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	(89,652)
Allowances | Indonesia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	(699,947)
Allowances | Others
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	(5,694)	(10,069)
Retail | Loans
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	185,700,453	166,789,122
Retail | Loans | Korea
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	182,344,832	166,310,457
Retail | Loans | Europe
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	0	0
Retail | Loans | China
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	0	0
Retail | Loans | Japan
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	94	101
Retail | Loans | United States
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	0	0
Retail | Loans | Cambodia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	1,444,906
Retail | Loans | Indonesia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	1,483,345
Retail | Loans | Others
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	427,276	478,564
Corporate | Loans
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	176,583,656	157,457,187
Corporate | Loans | Korea
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	160,385,598	149,149,657
Corporate | Loans | Europe
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	2,042,979	1,118,429
Corporate | Loans | China
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	4,518,737	3,135,501
Corporate | Loans | Japan
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	923,354	647,956
Corporate | Loans | United States
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	1,962,377	2,333,269
Corporate | Loans | Cambodia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	2,280,180
Corporate | Loans | Indonesia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	3,637,351
Corporate | Loans | Others
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	833,080	1,072,375
Credit card | Loans
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	18,797,630	18,648,410
Credit card | Loans | Korea
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	18,734,570	18,642,111
Credit card | Loans | Europe
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	0	0
Credit card | Loans | China
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	654	358
Credit card | Loans | Japan
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	10	81
Credit card | Loans | United States
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	0	0
Credit card | Loans | Cambodia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	0
Credit card | Loans | Indonesia
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	60,959
Credit card | Loans | Others
Group Regional Loans Line Items [Line Items]
Loans And Receivables	[1]	₩ 1,437	₩ 5,860
[1]	Amount includes loans measured at fair value through profit or loss, other comprehensive income and amortized cost.

Financial Risk Management_The_5

Financial Risk Management_The Groups Industrial Corporate Loans(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ 174,911,877	₩ 156,500,201
Loans
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ 176,583,656	₩ 157,457,187
%	100.00%	100.00%
Allowances
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ (1,671,779)	₩ (956,986)
Financial institutions
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	16,023,256	16,390,585
Financial institutions | Loans
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ 16,044,243	₩ 16,405,404
%	9.09%	10.42%
Financial institutions | Allowances
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ (20,987)	₩ (14,819)
Manufacturing
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	45,411,246	42,871,179
Manufacturing | Loans
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ 45,884,606	₩ 43,265,607
%	25.98%	27.48%
Manufacturing | Allowances
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ (473,360)	₩ (394,428)
Service
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	75,616,784	65,082,496
Service | Loans
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ 76,001,877	₩ 65,277,701
%	43.04%	41.46%
Service | Allowances
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ (385,093)	₩ (195,205)
Wholesale & Retail
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	22,888,436	18,494,489
Wholesale & Retail | Loans
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ 23,129,457	₩ 18,593,540
%	13.10%	11.81%
Wholesale & Retail | Allowances
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ (241,021)	₩ (99,051)
Construction
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	4,206,995	3,485,061
Construction | Loans
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ 4,397,814	₩ 3,679,798
%	2.49%	2.34%
Construction | Allowances
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ (190,819)	₩ (194,737)
Public sector
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	1,585,531	1,248,825
Public sector | Loans
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ 1,660,370	₩ 1,250,909
%	0.94%	0.79%
Public sector | Allowances
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ (74,839)	₩ (2,084)
Others
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	9,179,629	8,927,566
Others | Loans
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ 9,465,289	₩ 8,984,228
%	5.36%	5.70%
Others | Allowances
Industrial Corporate Loans Line Items[Line Items]
Corporate Loans	₩ (285,660)	₩ (56,662)

Financial Risk Management_Types

Financial Risk Management_Types Of The Groups Retail And Credit Card Loans(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	₩ 202,886,499	₩ 183,986,501
Loans
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	₩ 204,498,083	₩ 185,437,532
Portionof Retail And Credit Card Loans	100.00%	100.00%
Allowances
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	₩ (1,611,584)	₩ (1,451,031)
Housing
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	87,250,897	78,068,242
Housing | Loans
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	₩ 87,312,052	₩ 78,102,637
Portionof Retail And Credit Card Loans	42.70%	42.12%
Housing | Allowances
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	₩ (61,155)	₩ (34,395)
General
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	97,539,468	88,009,558
General | Loans
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	₩ 98,388,401	₩ 88,686,485
Portionof Retail And Credit Card Loans	48.11%	47.83%
General | Allowances
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	₩ (848,933)	₩ (676,927)
Credit card
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	18,096,134	17,908,701
Credit card | Loans
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	₩ 18,797,630	₩ 18,648,410
Portionof Retail And Credit Card Loans	9.19%	10.05%
Credit card | Allowances
Retail And Credit Card Loans Line Items[Line Items]
Retail And Credit Card Loans	₩ (701,496)	₩ (739,709)

Financial Risk Management_The_6

Financial Risk Management_The Groups Credit Risk Industrial Concentration Due From Financial Institutions And Securities Excluding Equity Securities And Derivative(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 182,107,787	₩ 141,174,929
Gross Carrying Amount [Member]
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	182,114,000	141,181,313
Allowances
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	(6,213)	(6,384)
Due From Financial Institutions At Amortized Cost
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	22,720,091	18,142,960
Due From Financial Institutions At Amortized Cost | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	22,720,091	18,142,960
Due From Financial Institutions At Amortized Cost | Gross Carrying Amount [Member]
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 22,723,354	₩ 18,147,672
%	100.00%	100.00%
Due From Financial Institutions At Amortized Cost | Gross Carrying Amount [Member] | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 22,723,354	₩ 18,147,672
%	100.00%	100.00%
Due From Financial Institutions At Amortized Cost | Allowances
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ (3,263)	₩ (4,712)
Due From Financial Institutions At Amortized Cost | Allowances | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	(3,263)	(4,712)
Due from financial institutions measured at fair value through profit or loss
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	100,094	216,367
Due from financial institutions measured at fair value through profit or loss | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	100,094	216,367
Due from financial institutions measured at fair value through profit or loss | Gross Carrying Amount [Member]
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 100,094	₩ 216,367
%	100.00%	100.00%
Due from financial institutions measured at fair value through profit or loss | Gross Carrying Amount [Member] | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 100,094	₩ 216,367
%	100.00%	100.00%
Due from financial institutions measured at fair value through profit or loss | Allowances
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 0	₩ 0
Due from financial institutions measured at fair value through profit or loss | Allowances | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through profit or loss
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	58,415,100	50,721,526
Securities measured at fair value through profit or loss | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	16,902,284	11,937,703
Securities measured at fair value through profit or loss | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	34,244,398	32,475,354
Securities measured at fair value through profit or loss | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	7,268,418	6,308,469
Securities measured at fair value through profit or loss | Gross Carrying Amount [Member]
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 58,415,100	₩ 50,721,526
%	100.00%	100.00%
Securities measured at fair value through profit or loss | Gross Carrying Amount [Member] | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 16,902,284	₩ 11,937,703
%	28.94%	23.53%
Securities measured at fair value through profit or loss | Gross Carrying Amount [Member] | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 34,244,398	₩ 32,475,354
%	58.62%	64.03%
Securities measured at fair value through profit or loss | Gross Carrying Amount [Member] | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 7,268,418	₩ 6,308,469
%	12.44%	12.44%
Securities measured at fair value through profit or loss | Allowances
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 0	₩ 0
Securities measured at fair value through profit or loss | Allowances | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through profit or loss | Allowances | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through profit or loss | Allowances | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Derivative financial assets
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	5,545,385	3,190,673
Derivative financial assets | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	44,670	7,330
Derivative financial assets | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	4,925,535	3,003,371
Derivative financial assets | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	575,180	179,972
Derivative financial assets | Gross Carrying Amount [Member]
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 5,545,385	₩ 3,190,673
%	100.00%	100.00%
Derivative financial assets | Gross Carrying Amount [Member] | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 44,670	₩ 7,330
%	0.81%	0.23%
Derivative financial assets | Gross Carrying Amount [Member] | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 4,925,535	₩ 3,003,371
%	88.82%	94.13%
Derivative financial assets | Gross Carrying Amount [Member] | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 575,180	₩ 179,972
%	10.37%	5.64%
Derivative financial assets | Allowances
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 0	₩ 0
Derivative financial assets | Allowances | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Derivative financial assets | Allowances | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Derivative financial assets | Allowances | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through other comprehensive income
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	58,456,889	43,556,848
Securities measured at fair value through other comprehensive income | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	26,205,864	16,744,232
Securities measured at fair value through other comprehensive income | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	24,847,602	21,439,272
Securities measured at fair value through other comprehensive income | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	7,403,423	5,373,344
Securities measured at fair value through other comprehensive income | Gross Carrying Amount [Member]
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 58,456,889	₩ 43,556,848
%	100.00%	100.00%
Securities measured at fair value through other comprehensive income | Gross Carrying Amount [Member] | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 26,205,864	₩ 16,744,232
%	44.83%	38.44%
Securities measured at fair value through other comprehensive income | Gross Carrying Amount [Member] | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 24,847,602	₩ 21,439,272
%	42.51%	49.22%
Securities measured at fair value through other comprehensive income | Gross Carrying Amount [Member] | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 7,403,423	₩ 5,373,344
%	12.66%	12.34%
Securities measured at fair value through other comprehensive income | Allowances
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 0	₩ 0
Securities measured at fair value through other comprehensive income | Allowances | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through other comprehensive income | Allowances | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through other comprehensive income | Allowances | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at amortized cost
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	36,870,228	25,346,555
Securities measured at amortized cost | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	24,018,854	11,115,398
Securities measured at amortized cost | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	11,017,436	12,278,534
Securities measured at amortized cost | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	1,833,938	1,952,623
Securities measured at amortized cost | Gross Carrying Amount [Member]
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 36,873,178	₩ 25,348,227
%	100.00%	100.00%
Securities measured at amortized cost | Gross Carrying Amount [Member] | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 24,018,884	₩ 11,115,435
%	65.14%	43.86%
Securities measured at amortized cost | Gross Carrying Amount [Member] | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 11,019,911	₩ 12,279,883
%	29.89%	48.44%
Securities measured at amortized cost | Gross Carrying Amount [Member] | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 1,834,383	₩ 1,952,909
%	4.97%	7.70%
Securities measured at amortized cost | Allowances
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ (2,950)	₩ (1,672)
Securities measured at amortized cost | Allowances | Government and government funded institutions
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	(30)	(37)
Securities measured at amortized cost | Allowances | Finance and insurance
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	(2,475)	(1,349)
Securities measured at amortized cost | Allowances | Others
GroupIndustrial Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives [Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ (445)	₩ (286)

Financial Risk Management_The_7

Financial Risk Management_The Groups Credit Risk Regional Concentration Due From Financial Institutions And Securities Excluding Equity Securities And Derivative(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 182,107,787	₩ 141,174,929
Gross Carrying Amount [Member]
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	182,114,000	141,181,313
Allowances
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	(6,213)	(6,384)
Due from financial institutions measured at amortized cost
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	22,720,091	18,142,960
Due from financial institutions measured at amortized cost | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	16,535,242	13,864,132
Due from financial institutions measured at amortized cost | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	2,030,331	1,318,581
Due from financial institutions measured at amortized cost | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	4,154,518	2,960,247
Due from financial institutions measured at amortized cost | Gross Carrying Amount [Member]
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 22,723,354	₩ 18,147,672
%	100.00%	100.00%
Due from financial institutions measured at amortized cost | Gross Carrying Amount [Member] | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 16,535,849	₩ 13,864,687
%	72.78%	76.40%
Due from financial institutions measured at amortized cost | Gross Carrying Amount [Member] | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 2,030,614	₩ 1,318,582
%	8.94%	7.27%
Due from financial institutions measured at amortized cost | Gross Carrying Amount [Member] | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 4,156,891	₩ 2,964,403
%	18.28%	16.33%
Due from financial institutions measured at amortized cost | Allowances
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ (3,263)	₩ (4,712)
Due from financial institutions measured at amortized cost | Allowances | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	(607)	(555)
Due from financial institutions measured at amortized cost | Allowances | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	(283)	(1)
Due from financial institutions measured at amortized cost | Allowances | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	(2,373)	(4,156)
Due from financial institutions measured at fair value through profit or loss
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	100,094	216,367
Due from financial institutions measured at fair value through profit or loss | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	100,094	216,367
Due from financial institutions measured at fair value through profit or loss | Gross Carrying Amount [Member]
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 100,094	₩ 216,367
%	100.00%	100.00%
Due from financial institutions measured at fair value through profit or loss | Gross Carrying Amount [Member] | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 100,094	₩ 216,367
%	100.00%	100.00%
Due from financial institutions measured at fair value through profit or loss | Allowances
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 0	₩ 0
Due from financial institutions measured at fair value through profit or loss | Allowances | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through profit or loss
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	58,415,100	50,721,526
Securities measured at fair value through profit or loss | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	53,991,978	46,413,061
Securities measured at fair value through profit or loss | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	2,370,538	1,939,330
Securities measured at fair value through profit or loss | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	2,052,584	2,369,135
Securities measured at fair value through profit or loss | Gross Carrying Amount [Member]
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 58,415,100	₩ 50,721,526
%	100.00%	100.00%
Securities measured at fair value through profit or loss | Gross Carrying Amount [Member] | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 53,991,978	₩ 46,413,061
%	92.43%	91.51%
Securities measured at fair value through profit or loss | Gross Carrying Amount [Member] | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 2,370,538	₩ 1,939,330
%	4.06%	3.82%
Securities measured at fair value through profit or loss | Gross Carrying Amount [Member] | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 2,052,584	₩ 2,369,135
%	3.51%	4.67%
Securities measured at fair value through profit or loss | Allowances
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 0	₩ 0
Securities measured at fair value through profit or loss | Allowances | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through profit or loss | Allowances | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through profit or loss | Allowances | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Derivative financial assets
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	5,545,385	3,190,673
Derivative financial assets | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	2,885,214	1,440,349
Derivative financial assets | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	706,866	529,956
Derivative financial assets | France
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives		358,951
Derivative financial assets | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	1,953,305	861,417
Derivative financial assets | Gross Carrying Amount [Member]
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 5,545,385	₩ 3,190,673
%	100.00%	100.00%
Derivative financial assets | Gross Carrying Amount [Member] | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 2,885,214	₩ 1,440,349
%	52.03%	45.14%
Derivative financial assets | Gross Carrying Amount [Member] | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 706,866	₩ 529,956
%	12.75%	16.61%
Derivative financial assets | Gross Carrying Amount [Member] | France
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives		₩ 358,951
%		11.25%
Derivative financial assets | Gross Carrying Amount [Member] | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 1,953,305	₩ 861,417
%	35.22%	27.00%
Derivative financial assets | Allowances
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 0	₩ 0
Derivative financial assets | Allowances | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Derivative financial assets | Allowances | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Derivative financial assets | Allowances | France
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Derivative financial assets | Allowances | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through other comprehensive income
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	58,456,889	43,556,848
Securities measured at fair value through other comprehensive income | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	54,786,461	40,948,853
Securities measured at fair value through other comprehensive income | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	942,151	687,243
Securities measured at fair value through other comprehensive income | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	2,728,277	1,920,752
Securities measured at fair value through other comprehensive income | Gross Carrying Amount [Member]
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 58,456,889	₩ 43,556,848
%	100.00%	100.00%
Securities measured at fair value through other comprehensive income | Gross Carrying Amount [Member] | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 54,786,461	₩ 40,948,853
%	93.72%	94.01%
Securities measured at fair value through other comprehensive income | Gross Carrying Amount [Member] | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 942,151	₩ 687,243
%	1.61%	1.58%
Securities measured at fair value through other comprehensive income | Gross Carrying Amount [Member] | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 2,728,277	₩ 1,920,752
%	4.67%	4.41%
Securities measured at fair value through other comprehensive income | Allowances
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 0	₩ 0
Securities measured at fair value through other comprehensive income | Allowances | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through other comprehensive income | Allowances | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at fair value through other comprehensive income | Allowances | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	0	0
Securities measured at amortized cost
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	36,870,228	25,346,555
Securities measured at amortized cost | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	34,543,589	22,590,507
Securities measured at amortized cost | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	1,049,146	1,312,724
Securities measured at amortized cost | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	1,277,493	1,443,324
Securities measured at amortized cost | Gross Carrying Amount [Member]
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 36,873,178	₩ 25,348,227
%	100.00%	100.00%
Securities measured at amortized cost | Gross Carrying Amount [Member] | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 34,545,872	₩ 22,591,541
%	93.69%	89.12%
Securities measured at amortized cost | Gross Carrying Amount [Member] | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 1,049,387	₩ 1,312,941
%	2.85%	5.18%
Securities measured at amortized cost | Gross Carrying Amount [Member] | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ 1,277,919	₩ 1,443,745
%	3.46%	5.70%
Securities measured at amortized cost | Allowances
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ (2,950)	₩ (1,672)
Securities measured at amortized cost | Allowances | Korea
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	(2,283)	(1,034)
Securities measured at amortized cost | Allowances | United States
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	(241)	(217)
Securities measured at amortized cost | Allowances | Others
Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items]
Due From Financial Institutions And Securities Excluding Equity Securities And Derivatives	₩ (426)	₩ (421)

Financial Risk Management_The R

Financial Risk Management_The Remaining Contractual Maturity Of Financial Assets And Liabilities Excluding Derivatives Held For Cash Flow Hedging(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		₩ 627,962,892	₩ 539,836,206
Cash and due from financial institutions
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[1]	10,358,084	7,488,979
Cash Flow Of Restricted Due From Financial Institutions		15,331,515	13,394,627
Financial assets at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		61,576,339	54,642,998
Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[2]	5,210,512	3,008,598
Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[3]	275,876	170,126
Loans measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		423,652,655	385,303,297
Financial assets at fair value through other comprehensive income
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	67,806,453	48,904,078
Securities measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	45,876,958	32,038,787
Other financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		13,206,015	8,279,343
Financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		500,715,969	439,430,974
Financial liabilities at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	2,025,952	2,663,327
Financial liabilities designated at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	9,784,107	12,704,826
Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	5,014,072	2,842,950
Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[3]	104,697	52,177
Deposits
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[5]	341,482,538	309,872,773
Borrowings Related To Liquidity Risk
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		50,160,304	38,182,349
Debentures
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		65,678,525	53,543,752
Lease liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		591,952	577,522
Other financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		25,873,822	18,991,298
Off-balance sheet items
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		172,647,379	155,645,005
Acceptances And Guarantees Contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		8,548,928
Financial guarantee contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[6]	4,964,468	3,847,390
Commitments
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[7]	159,133,983	151,797,615
On demand | Financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		78,665,119	65,901,703
On demand | Cash and due from financial institutions
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[1]	7,186,004	5,323,332
On demand | Financial assets at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		60,520,103	52,488,545
On demand | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[2]	5,210,512	3,008,598
On demand | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[3]	0	0
On demand | Loans measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		3,126,366	2,908,095
On demand | Financial assets at fair value through other comprehensive income
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	2,532,279	2,101,605
On demand | Securities measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	0	0
On demand | Other financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		89,855	71,528
On demand | Financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		208,505,795	167,244,458
On demand | Financial liabilities at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	2,025,952	2,663,327
On demand | Financial liabilities designated at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	9,784,107	12,704,826
On demand | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	5,014,072	2,842,950
On demand | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[3]	0	0
On demand | Deposits
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[5]	182,111,594	141,821,986
On demand | Borrowings Related To Liquidity Risk
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		9,333,894	7,074,508
On demand | Debentures
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		18,105	22,285
On demand | Lease liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		205	256
On demand | Other financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		217,866	114,320
On demand | Off-balance sheet items
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		172,647,379	155,645,005
On demand | Acceptances And Guarantees Contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		8,548,928
On demand | Financial guarantee contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[6]	4,964,468	3,847,390
On demand | Commitments
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[7]	159,133,983	151,797,615
Up to 1 month | Financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		44,356,445	42,638,440
Up to 1 month | Cash and due from financial institutions
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[1]	1,449,949	1,038,805
Up to 1 month | Financial assets at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		242,664	446,069
Up to 1 month | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[2]	0	0
Up to 1 month | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[3]	9,371	4,892
Up to 1 month | Loans measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		29,240,531	33,042,040
Up to 1 month | Financial assets at fair value through other comprehensive income
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	896,523	526,465
Up to 1 month | Securities measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	1,003,104	1,002,164
Up to 1 month | Other financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		11,514,303	6,578,005
Up to 1 month | Financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		61,923,070	49,872,191
Up to 1 month | Financial liabilities at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
Up to 1 month | Financial liabilities designated at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
Up to 1 month | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
Up to 1 month | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[3]	3,123	14,764
Up to 1 month | Deposits
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[5]	17,207,360	17,180,492
Up to 1 month | Borrowings Related To Liquidity Risk
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		17,730,230	12,341,516
Up to 1 month | Debentures
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		2,806,105	2,652,730
Up to 1 month | Lease liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		22,372	19,304
Up to 1 month | Other financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		24,153,880	17,663,385
Up to 1 month | Off-balance sheet items
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		0	0
Up to 1 month | Acceptances And Guarantees Contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		0
Up to 1 month | Financial guarantee contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[6]	0	0
Up to 1 month | Commitments
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[7]	0	0
1-3 montshs | Financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		40,935,229	36,912,087
1-3 montshs | Cash and due from financial institutions
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[1]	469,858	286,091
1-3 montshs | Financial assets at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		83,408	273,144
1-3 montshs | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[2]	0	0
1-3 montshs | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[3]	32,816	20,216
1-3 montshs | Loans measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		35,862,097	32,668,128
1-3 montshs | Financial assets at fair value through other comprehensive income
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	1,556,600	1,403,884
1-3 montshs | Securities measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	2,724,223	2,080,834
1-3 montshs | Other financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		206,227	179,790
1-3 montshs | Financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		40,432,762	34,410,292
1-3 montshs | Financial liabilities at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
1-3 montshs | Financial liabilities designated at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
1-3 montshs | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
1-3 montshs | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[3]	4,120	15,588
1-3 montshs | Deposits
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[5]	28,485,765	27,300,542
1-3 montshs | Borrowings Related To Liquidity Risk
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		4,923,897	3,057,980
1-3 montshs | Debentures
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		6,769,859	3,812,476
1-3 montshs | Lease liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		40,376	35,730
1-3 montshs | Other financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		208,745	187,976
1-3 montshs | Off-balance sheet items
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		0	0
1-3 montshs | Acceptances And Guarantees Contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		0
1-3 montshs | Financial guarantee contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[6]	0	0
1-3 montshs | Commitments
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[7]	0	0
3-12 months | Financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		151,208,626	140,008,538
3-12 months | Cash and due from financial institutions
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[1]	1,217,217	822,123
3-12 months | Financial assets at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		25,658	187,821
3-12 months | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[2]	0	0
3-12 months | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[3]	74,364	37,441
3-12 months | Loans measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		135,526,320	125,125,270
3-12 months | Financial assets at fair value through other comprehensive income
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	10,523,465	6,761,533
3-12 months | Securities measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	2,567,726	5,700,500
3-12 months | Other financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		1,273,876	1,373,850
3-12 months | Financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		124,371,254	130,819,629
3-12 months | Financial liabilities at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
3-12 months | Financial liabilities designated at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
3-12 months | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
3-12 months | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[3]	62,147	1,652
3-12 months | Deposits
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[5]	99,879,946	110,410,809
3-12 months | Borrowings Related To Liquidity Risk
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		9,617,100	8,994,817
3-12 months | Debentures
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		14,330,686	11,062,873
3-12 months | Lease liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		152,084	137,419
3-12 months | Other financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		329,291	212,059
3-12 months | Off-balance sheet items
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		0	0
3-12 months | Acceptances And Guarantees Contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		0
3-12 months | Financial guarantee contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[6]	0	0
3-12 months | Commitments
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[7]	0	0
1~5 years | Financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		161,540,493	136,109,923
1~5 years | Cash and due from financial institutions
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[1]	35,056	18,628
1~5 years | Financial assets at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		142,547	236,130
1~5 years | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[2]	0	0
1~5 years | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[3]	70,863	41,401
1~5 years | Loans measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		116,211,931	94,802,566
1~5 years | Financial assets at fair value through other comprehensive income
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	35,347,644	33,604,010
1~5 years | Securities measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	9,658,717	7,366,945
1~5 years | Other financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		73,735	40,243
1~5 years | Financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		56,378,541	49,265,152
1~5 years | Financial liabilities at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
1~5 years | Financial liabilities designated at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
1~5 years | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
1~5 years | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[3]	35,198	20,044
1~5 years | Deposits
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[5]	12,133,364	10,804,440
1~5 years | Borrowings Related To Liquidity Risk
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		7,616,809	4,950,294
1~5 years | Debentures
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		35,512,544	32,477,672
1~5 years | Lease liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		332,033	318,781
1~5 years | Other financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		748,593	693,921
1~5 years | Off-balance sheet items
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		0	0
1~5 years | Acceptances And Guarantees Contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		0
1~5 years | Financial guarantee contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[6]	0	0
1~5 years | Commitments
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[7]	0	0
Over 5 years | Financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		151,256,980	118,265,515
Over 5 years | Cash and due from financial institutions
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[1]	0	0
Over 5 years | Financial assets at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		561,959	1,011,289
Over 5 years | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[2]	0	0
Over 5 years | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[3]	88,462	66,176
Over 5 years | Loans measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		103,685,410	96,757,198
Over 5 years | Financial assets at fair value through other comprehensive income
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	16,949,942	4,506,581
Over 5 years | Securities measured at amortized cost
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk	[4]	29,923,188	15,888,344
Over 5 years | Other financial assets
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Assets Held For Managing Liquidity Risk		48,019	35,927
Over 5 years | Financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		9,104,547	7,819,252
Over 5 years | Financial liabilities at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
Over 5 years | Financial liabilities designated at fair value through profit or loss
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
Over 5 years | Derivatives held for trading
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[2]	0	0
Over 5 years | Derivatives held for hedging
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[3]	109	129
Over 5 years | Deposits
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk	[5]	1,664,509	2,354,504
Over 5 years | Borrowings Related To Liquidity Risk
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		938,374	1,763,234
Over 5 years | Debentures
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		6,241,226	3,515,716
Over 5 years | Lease liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		44,882	66,032
Over 5 years | Other financial liabilities
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Financial Liability Held For Managing Liquidity Risk		215,447	119,637
Over 5 years | Off-balance sheet items
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		0	0
Over 5 years | Acceptances And Guarantees Contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk		0
Over 5 years | Financial guarantee contracts
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[6]	0	0
Over 5 years | Commitments
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items]
Off Balance Sheet Item Held For Managing Liquidity Risk	[7]	₩ 0	₩ 0
[1]	Restricted due from financial instruments amounting to KRW 13,394,627 million and KRW 15,331,515 million are excluded as of December 31, 2019 and 2020, respectively.
[2]	Financial liabilities measured or designated at fair value through profit or loss and derivatives held for trading are not managed by contractual maturity because they are expected to be traded or redeemed before maturity. Therefore, the carrying amounts of those financial instruments are included in the 'On demand' category.
[3]	Cash flows of derivative instruments held for hedging are shown at net amounts of cash inflows and outflows by remaining contractual maturity.
[4]	Equity securities designated as financial assets at fair value through other comprehensive income are included in the 'On demand' category because most are available for sale at any time. However, equity securities restricted from sale, are included in the category corresponding to the date on which the restriction is lifted.
[5]	Deposits that are contractually repayable on demand or on short notice are included in the 'On demand' category.
[6]	Cash flows under financial guarantee contracts are classified based on the earliest period that the contract can be executed.
[7]	Commitments are included in the 'On demand' category because payments can be requested at any time.

Financial Risk Management_The_8

Financial Risk Management_The Contractual Cash Flows Of Derivatives Held For Cash Flow Hedging(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Maturity Analysis For Derivative Financial Liabilities Line Items [Line Items]
Cash flow to be received (paid) of net-settled derivatives	₩ (46,847)	₩ (17,009)
Cash flow to be received of gross-settled derivatives	3,112,609	2,760,970
Cash flow to be paid of gross-settled derivatives	(2,450,185)	(2,844,337)
Up to 1 month
Disclosure Of Maturity Analysis For Derivative Financial Liabilities Line Items [Line Items]
Cash flow to be received (paid) of net-settled derivatives	(1,082)	(639)
Cash flow to be received of gross-settled derivatives	85,064	14,119
Cash flow to be paid of gross-settled derivatives	(88,952)	(18,171)
1-3 montshs
Disclosure Of Maturity Analysis For Derivative Financial Liabilities Line Items [Line Items]
Cash flow to be received (paid) of net-settled derivatives	(5,569)	(1,831)
Cash flow to be received of gross-settled derivatives	220,339	200,170
Cash flow to be paid of gross-settled derivatives	(221,261)	(199,141)
3-12 months
Disclosure Of Maturity Analysis For Derivative Financial Liabilities Line Items [Line Items]
Cash flow to be received (paid) of net-settled derivatives	(15,132)	(5,021)
Cash flow to be received of gross-settled derivatives	517,929	657,909
Cash flow to be paid of gross-settled derivatives	(523,442)	(671,375)
1~5 years
Disclosure Of Maturity Analysis For Derivative Financial Liabilities Line Items [Line Items]
Cash flow to be received (paid) of net-settled derivatives	(25,354)	(10,602)
Cash flow to be received of gross-settled derivatives	2,289,277	1,888,772
Cash flow to be paid of gross-settled derivatives	(1,616,530)	(1,955,650)
Over 5 years
Disclosure Of Maturity Analysis For Derivative Financial Liabilities Line Items [Line Items]
Cash flow to be received (paid) of net-settled derivatives	290	1,084
Cash flow to be received of gross-settled derivatives	0	0
Cash flow to be paid of gross-settled derivatives	₩ 0	₩ 0

Financial Risk Management_Value

Financial Risk Management_Value At Risk(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Kookmin Bank | Average
Value At Risk Line Items [Line Items]
Value At Risk	₩ 105,428	₩ 17,545
Kookmin Bank | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	14,225	13,641
Kookmin Bank | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	158,798	24,849
Kookmin Bank | Ending
Value At Risk Line Items [Line Items]
Value At Risk	117,634	20,377
Kookmin Bank | Interest rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	59,147	11,190
Kookmin Bank | Interest rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	9,588	1,725
Kookmin Bank | Interest rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	105,983	20,467
Kookmin Bank | Interest rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	50,795	16,628
Kookmin Bank | Stock price risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	15,379	3,434
Kookmin Bank | Stock price risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	3,787	2,402
Kookmin Bank | Stock price risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	24,821	4,310
Kookmin Bank | Stock price risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	24,821	3,914
Kookmin Bank | Foreign exchange rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	36,281	15,760
Kookmin Bank | Foreign exchange rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	5,302	11,416
Kookmin Bank | Foreign exchange rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	67,766	20,704
Kookmin Bank | Foreign exchange rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	49,338	13,081
Kookmin Bank | Deduction of diversification effect | Average
Value At Risk Line Items [Line Items]
Value At Risk	0	0
Kookmin Bank | Deduction of diversification effect | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	0	0
Kookmin Bank | Deduction of diversification effect | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	0	0
Kookmin Bank | Deduction of diversification effect | Ending
Value At Risk Line Items [Line Items]
Value At Risk	(7,320)	(13,246)
KB Securities Co., Ltd. | Average
Value At Risk Line Items [Line Items]
Value At Risk	938,968	784,652
KB Securities Co., Ltd. | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	797,452	685,267
KB Securities Co., Ltd. | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	1,095,145	870,269
KB Securities Co., Ltd. | Ending
Value At Risk Line Items [Line Items]
Value At Risk	979,949	855,853
KB Securities Co., Ltd. | Interest rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	656,651	520,681
KB Securities Co., Ltd. | Interest rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	575,053	460,539
KB Securities Co., Ltd. | Interest rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	755,704	563,991
KB Securities Co., Ltd. | Interest rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	755,704	563,991
KB Securities Co., Ltd. | Stock price risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	267,186	248,183
KB Securities Co., Ltd. | Stock price risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	213,639	217,149
KB Securities Co., Ltd. | Stock price risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	317,478	282,584
KB Securities Co., Ltd. | Stock price risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	213,639	270,443
KB Securities Co., Ltd. | Foreign exchange rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	15,113	15,785
KB Securities Co., Ltd. | Foreign exchange rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	8,759	7,578
KB Securities Co., Ltd. | Foreign exchange rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	21,907	23,674
KB Securities Co., Ltd. | Foreign exchange rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	10,588	21,418
KB Securities Co., Ltd. | Commodity risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	18	3
KB Securities Co., Ltd. | Commodity risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	1	1
KB Securities Co., Ltd. | Commodity risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	56	20
KB Securities Co., Ltd. | Commodity risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	18	1
KB Insurance Co., Ltd. | Average
Value At Risk Line Items [Line Items]
Value At Risk	32,211	26,711
KB Insurance Co., Ltd. | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	26,341	18,354
KB Insurance Co., Ltd. | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	36,991	32,454
KB Insurance Co., Ltd. | Ending
Value At Risk Line Items [Line Items]
Value At Risk	35,946	29,392
KB Insurance Co., Ltd. | Interest rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	5,682	3,418
KB Insurance Co., Ltd. | Interest rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	2,850	2,201
KB Insurance Co., Ltd. | Interest rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	7,652	4,904
KB Insurance Co., Ltd. | Interest rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	7,055	3,252
KB Insurance Co., Ltd. | Foreign exchange rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	26,529	23,293
KB Insurance Co., Ltd. | Foreign exchange rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	23,491	16,153
KB Insurance Co., Ltd. | Foreign exchange rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	29,339	27,550
KB Insurance Co., Ltd. | Foreign exchange rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	28,891	26,140
KB Life Insurance Co., Ltd. | Average
Value At Risk Line Items [Line Items]
Value At Risk	3,054	2,630
KB Life Insurance Co., Ltd. | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	1,784	1,295
KB Life Insurance Co., Ltd. | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	4,389	3,597
KB Life Insurance Co., Ltd. | Ending
Value At Risk Line Items [Line Items]
Value At Risk	2,743	2,038
KB Life Insurance Co., Ltd. | Interest rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	3,054	2,630
KB Life Insurance Co., Ltd. | Interest rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	1,784	1,295
KB Life Insurance Co., Ltd. | Interest rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	4,389	3,597
KB Life Insurance Co., Ltd. | Interest rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	2,743	2,038
KB Investment Co., Ltd. | Average
Value At Risk Line Items [Line Items]
Value At Risk	13,017	7,452
KB Investment Co., Ltd. | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	10,167	4,072
KB Investment Co., Ltd. | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	20,213	10,480
KB Investment Co., Ltd. | Ending
Value At Risk Line Items [Line Items]
Value At Risk	17,908	9,988
KB Investment Co., Ltd. | Stock price risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	1,153	0
KB Investment Co., Ltd. | Stock price risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	0	0
KB Investment Co., Ltd. | Stock price risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	7,588	0
KB Investment Co., Ltd. | Stock price risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	6,253	0
KB Investment Co., Ltd. | Foreign exchange rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	11,864	7,452
KB Investment Co., Ltd. | Foreign exchange rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	10,167	4,072
KB Investment Co., Ltd. | Foreign exchange rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	12,625	10,480
KB Investment Co., Ltd. | Foreign exchange rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	11,655	9,988
KB Kookmin Card Co., Ltd. | Average
Value At Risk Line Items [Line Items]
Value At Risk	2,712	235
KB Kookmin Card Co., Ltd. | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	169	187
KB Kookmin Card Co., Ltd. | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	7,861	264
KB Kookmin Card Co., Ltd. | Ending
Value At Risk Line Items [Line Items]
Value At Risk	7,546	187
KB Kookmin Card Co., Ltd. | Foreign exchange rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	2,712
KB Kookmin Card Co., Ltd. | Foreign exchange rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	169
KB Kookmin Card Co., Ltd. | Foreign exchange rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	7,861
KB Kookmin Card Co., Ltd. | Foreign exchange rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	7,546
Prudential Life Insurance Company of Korea Ltd. | Average
Value At Risk Line Items [Line Items]
Value At Risk	7,977
Prudential Life Insurance Company of Korea Ltd. | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	7,977
Prudential Life Insurance Company of Korea Ltd. | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	7,977
Prudential Life Insurance Company of Korea Ltd. | Ending
Value At Risk Line Items [Line Items]
Value At Risk	7,977
Prudential Life Insurance Company of Korea Ltd. | Foreign exchange rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	7,977
Prudential Life Insurance Company of Korea Ltd. | Foreign exchange rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	7,977
Prudential Life Insurance Company of Korea Ltd. | Foreign exchange rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	7,977
Prudential Life Insurance Company of Korea Ltd. | Foreign exchange rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	7,977
KB Capital Co.,Ltd. | Average
Value At Risk Line Items [Line Items]
Value At Risk	810	410
KB Capital Co.,Ltd. | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	297	327
KB Capital Co.,Ltd. | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	1,315	464
KB Capital Co.,Ltd. | Ending
Value At Risk Line Items [Line Items]
Value At Risk	896	327
KB Capital Co.,Ltd. | Foreign exchange rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	810
KB Capital Co.,Ltd. | Foreign exchange rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	297
KB Capital Co.,Ltd. | Foreign exchange rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	1,315
KB Capital Co.,Ltd. | Foreign exchange rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	896
KB Real Estate Trust Co., Ltd. | Average
Value At Risk Line Items [Line Items]
Value At Risk	399	145
KB Real Estate Trust Co., Ltd. | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	0	0
KB Real Estate Trust Co., Ltd. | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	435	435
KB Real Estate Trust Co., Ltd. | Ending
Value At Risk Line Items [Line Items]
Value At Risk	0	435
KB Real Estate Trust Co., Ltd. | Stock price risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	399
KB Real Estate Trust Co., Ltd. | Stock price risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	0
KB Real Estate Trust Co., Ltd. | Stock price risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	435
KB Real Estate Trust Co., Ltd. | Stock price risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	0
KB Asset Management Co., Ltd. | Average
Value At Risk Line Items [Line Items]
Value At Risk	5,492	4,698
KB Asset Management Co., Ltd. | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	1,208	2,529
KB Asset Management Co., Ltd. | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	13,596	8,913
KB Asset Management Co., Ltd. | Ending
Value At Risk Line Items [Line Items]
Value At Risk	1,141	7,119
KB Asset Management Co., Ltd. | Interest rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	1,298	417
KB Asset Management Co., Ltd. | Interest rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	0	202
KB Asset Management Co., Ltd. | Interest rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	2,589	1,238
KB Asset Management Co., Ltd. | Interest rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	0	509
KB Asset Management Co., Ltd. | Stock price risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	3,382	3,456
KB Asset Management Co., Ltd. | Stock price risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	0	1,965
KB Asset Management Co., Ltd. | Stock price risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	9,484	6,248
KB Asset Management Co., Ltd. | Stock price risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	0	6,248
KB Asset Management Co., Ltd. | Foreign exchange rate risk | Average
Value At Risk Line Items [Line Items]
Value At Risk	812	825
KB Asset Management Co., Ltd. | Foreign exchange rate risk | Minimum
Value At Risk Line Items [Line Items]
Value At Risk	1,208	362
KB Asset Management Co., Ltd. | Foreign exchange rate risk | Maximum
Value At Risk Line Items [Line Items]
Value At Risk	1,523	1,427
KB Asset Management Co., Ltd. | Foreign exchange rate risk | Ending
Value At Risk Line Items [Line Items]
Value At Risk	₩ 1,141	₩ 362

Financial Risk Management_Requi

Financial Risk Management_Required Equity Capital Not Measured By Value At Risk(Details) - Kookmin Bank - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Required Equity Capital Not Measured By VaR Line Items [Line Items]
Required Equity Capital Not Measured By VaR	₩ 71,316	₩ 87,535
Interest rate risk
Required Equity Capital Not Measured By VaR Line Items [Line Items]
Required Equity Capital Not Measured By VaR	40,290	83,731
Stock price risk
Required Equity Capital Not Measured By VaR Line Items [Line Items]
Required Equity Capital Not Measured By VaR	7,088	1,954
Foreign exchange rate risk
Required Equity Capital Not Measured By VaR Line Items [Line Items]
Required Equity Capital Not Measured By VaR	₩ 23,938	₩ 1,850

Financial Risk Management_Chang

Financial Risk Management_Change In Equity And Earnings From Interest Rate Risk(Details) - Kookmin Bank - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Scenario 1 (Parallel Rise)
Change In Equity And Earnings From Interest Rate Risk [Line Items]
Changes In The Economic Value Of Equity	₩ 544,087	₩ 483,207
Changes In Net Interest Income	415,339	152,013
Scenario 2 (Parallel Decline)
Change In Equity And Earnings From Interest Rate Risk [Line Items]
Changes In The Economic Value Of Equity	0	31,718
Changes In Net Interest Income	0	9,717
Scenario 3 (Short-Term Decline, Long-Term Rise)
Change In Equity And Earnings From Interest Rate Risk [Line Items]
Changes In The Economic Value Of Equity	245,337	257,756
Changes In Net Interest Income	0	0
Scenario 4 (Short-Term Rise, Long-Term Decline) [Member]
Change In Equity And Earnings From Interest Rate Risk [Line Items]
Changes In The Economic Value Of Equity	423,673	411,237
Changes In Net Interest Income	0	0
Scenario 5 (Short-Term Rise)
Change In Equity And Earnings From Interest Rate Risk [Line Items]
Changes In The Economic Value Of Equity	466,220	378,380
Changes In Net Interest Income	0	0
Scenario 6 (Short-Term Decline)
Change In Equity And Earnings From Interest Rate Risk [Line Items]
Changes In The Economic Value Of Equity	480,246	492,047
Changes In Net Interest Income	0	0
Maximum of 6 scenarios
Change In Equity And Earnings From Interest Rate Risk [Line Items]
Changes In The Economic Value Of Equity	544,087	492,047
Changes In Net Interest Income	415,339	152,013
Basic Capital
Change In Equity And Earnings From Interest Rate Risk [Line Items]
Changes In The Economic Value Of Equity	28,234,310	27,609,684
Changes In Net Interest Income	₩ 0	₩ 0

Financial Risk Management_Inter

Financial Risk Management_Interest Rate Value At Risk(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
KB Securities Co., Ltd.
Interest Rate Value At Risk Line Items [Line Items]
Interest Rate Value At Risk	₩ 28,396	₩ 20,605
KB Insurance Co., Ltd.
Interest Rate Value At Risk Line Items [Line Items]
Interest Rate Value At Risk	585,648	345,292
KB Kookmin Card Co., Ltd.
Interest Rate Value At Risk Line Items [Line Items]
Interest Rate Value At Risk	64,783	49,878
KB Life Insurance Co., Ltd.
Interest Rate Value At Risk Line Items [Line Items]
Interest Rate Value At Risk	29,392	56,214
KB Savings Bank Co., Ltd.
Interest Rate Value At Risk Line Items [Line Items]
Interest Rate Value At Risk	6,014	6,510
Prudential Life Insurance Company of Korea Ltd.
Interest Rate Value At Risk Line Items [Line Items]
Interest Rate Value At Risk	132,576	0
KB Capital Co.,Ltd.
Interest Rate Value At Risk Line Items [Line Items]
Interest Rate Value At Risk	₩ 27,805	₩ 33,038

Financial Risk Management_Finan

Financial Risk Management_Financial Instruments In Foreign Currencies(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	₩ 54,922,901	₩ 41,669,192
Cash and due from financial institutions
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	7,769,696	5,490,428
Financial assets at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	6,226,201	7,107,723
Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	414,927	347,845
Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	112,431	83,610
Loans measured at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	28,210,688	18,133,279
Financial assets at fair value through other comprehensive income
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	6,054,893	5,057,842
Financial assets at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	2,607,588	2,884,287
Other financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	3,526,477	2,564,178
Financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	49,766,586	38,348,678
Financial liabilities at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	1,267,690	2,754,602
Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	684,373	502,077
Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	153,578	35,538
Deposits
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	24,519,600	15,908,851
Borrowings Translated Into Korean Won
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	13,187,235	10,616,032
Debentures
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	6,111,215	5,345,510
Other financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	3,842,895	3,186,068
Off-balance sheet items
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Off Balance Sheet Item In Foreign Currencies	16,432,781	19,422,027
USD | Financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	39,036,629	32,306,916
USD | Cash and due from financial institutions
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	4,482,459	2,581,674
USD | Financial assets at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	5,464,176	6,275,426
USD | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	339,190	244,010
USD | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	112,431	83,610
USD | Loans measured at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	18,783,163	14,478,537
USD | Financial assets at fair value through other comprehensive income
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	5,446,539	4,643,921
USD | Financial assets at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	1,660,713	2,380,000
USD | Other financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	2,747,958	1,619,738
USD | Financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	36,957,646	32,371,714
USD | Financial liabilities at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	1,267,690	2,754,602
USD | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	497,975	351,394
USD | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	139,528	35,538
USD | Deposits
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	16,441,107	12,266,565
USD | Borrowings Translated Into Korean Won
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	10,068,379	9,399,828
USD | Debentures
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	5,135,667	5,007,285
USD | Other financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	3,407,300	2,556,502
USD | Off-balance sheet items
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Off Balance Sheet Item In Foreign Currencies	14,991,859	18,702,327
JPY | Financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	1,263,185	1,156,233
JPY | Cash and due from financial institutions
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	583,545	354,484
JPY | Financial assets at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	39,817	43,124
JPY | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	18,061	22,729
JPY | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	0	0
JPY | Loans measured at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	565,918	484,087
JPY | Financial assets at fair value through other comprehensive income
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	5,271	21,267
JPY | Financial assets at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	0	0
JPY | Other financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	50,573	230,542
JPY | Financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	1,479,086	990,895
JPY | Financial liabilities at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
JPY | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	21,221	39,050
JPY | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
JPY | Deposits
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	933,268	766,720
JPY | Borrowings Translated Into Korean Won
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	485,618	125,096
JPY | Debentures
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
JPY | Other financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	38,979	60,029
JPY | Off-balance sheet items
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Off Balance Sheet Item In Foreign Currencies	32,200	32,694
EUR | Financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	3,063,531	2,497,907
EUR | Cash and due from financial institutions
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	558,793	377,651
EUR | Financial assets at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	508,587	610,820
EUR | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	41,834	25,226
EUR | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	0	0
EUR | Loans measured at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	1,387,089	795,285
EUR | Financial assets at fair value through other comprehensive income
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	35,478	71,078
EUR | Financial assets at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	300,315	304,484
EUR | Other financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	231,435	313,363
EUR | Financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	2,244,352	1,348,100
EUR | Financial liabilities at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
EUR | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	84,712	36,018
EUR | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
EUR | Deposits
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	991,872	791,638
EUR | Borrowings Translated Into Korean Won
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	402,802	419,155
EUR | Debentures
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	666,873	0
EUR | Other financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	98,093	101,289
EUR | Off-balance sheet items
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Off Balance Sheet Item In Foreign Currencies	248,007	176,756
GBP | Financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	425,339	349,197
GBP | Cash and due from financial institutions
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	113,586	128,600
GBP | Financial assets at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	30,030	23,034
GBP | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	1,774	698
GBP | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	0	0
GBP | Loans measured at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	259,787	178,628
GBP | Financial assets at fair value through other comprehensive income
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	0	0
GBP | Financial assets at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	0	0
GBP | Other financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	20,162	18,237
GBP | Financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	579,884	477,341
GBP | Financial liabilities at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
GBP | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	1,817	0
GBP | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
GBP | Deposits
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	66,440	45,892
GBP | Borrowings Translated Into Korean Won
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	501,716	408,918
GBP | Debentures
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
GBP | Other financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	9,911	22,531
GBP | Off-balance sheet items
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Off Balance Sheet Item In Foreign Currencies	741	0
CNY | Financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	3,080,943	2,992,825
CNY | Cash and due from financial institutions
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	878,798	1,207,769
CNY | Financial assets at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	6,046	6,131
CNY | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	4,344	6,786
CNY | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	0	0
CNY | Loans measured at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	1,617,715	1,205,297
CNY | Financial assets at fair value through other comprehensive income
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	342,804	282,390
CNY | Financial assets at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	108,594	97,845
CNY | Other financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	122,642	186,607
CNY | Financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	1,849,065	1,690,836
CNY | Financial liabilities at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
CNY | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	42,023	7,806
CNY | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
CNY | Deposits
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	1,755,272	1,477,097
CNY | Borrowings Translated Into Korean Won
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	439	15,092
CNY | Debentures
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
CNY | Other financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	51,331	190,841
CNY | Off-balance sheet items
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Off Balance Sheet Item In Foreign Currencies	253,472	252,369
Others | Financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	8,053,274	2,366,114
Others | Cash and due from financial institutions
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	1,152,515	840,250
Others | Financial assets at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	177,545	149,188
Others | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	9,724	48,396
Others | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	0	0
Others | Loans measured at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	5,597,016	991,445
Others | Financial assets at fair value through other comprehensive income
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	224,801	39,186
Others | Financial assets at amortized cost
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	537,966	101,958
Others | Other financial assets
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Asset Reporting Currency Denominated Value	353,707	195,691
Others | Financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	6,656,553	1,469,792
Others | Financial liabilities at fair value through profit or loss
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	0	0
Others | Derivatives held for trading
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	36,625	67,809
Others | Derivatives held for hedging
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	14,050	0
Others | Deposits
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	4,331,641	560,939
Others | Borrowings Translated Into Korean Won
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	1,728,281	247,943
Others | Debentures
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	308,675	338,225
Others | Other financial liabilities
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Liability Reporting Currency Denominated Value	237,281	254,876
Others | Off-balance sheet items
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items]
Off Balance Sheet Item In Foreign Currencies	₩ 906,502	₩ 257,881

Financial Risk Management_Objec

Financial Risk Management_Objectives Policies And Processes For Managing Capital(Details) ₩ in Millions	Dec. 31, 2020KRW (₩)	Dec. 31, 2019KRW (₩)
Disclosure Of Objectives Policies And Processes For Managing Capital Abstract [Abstract]
Minimum Common Equity Tier One Ratio	8.00%
Minimum Tier One Ratio	9.50%
Minimum Total Regulatory Capital Ratio	11.50%
Capital Abstract [Abstract]
Equity Capital:	₩ 40,080,136	₩ 36,995,181
Tier One Risk Based Capital Abstract [Abstract]
Tier 1 Capital	36,895,778	35,426,114
Common Equity Tier 1 Capital	34,886,283	34,709,873
Additional Tier 1 Capital	2,009,495	716,241
Tier 2 Capital	3,184,358	1,569,067
Risk-weighted assets:	₩ 262,349,242	₩ 255,549,020
Equity Capital (%):	0.1528	0.1448
Tier 1 Capital (%)	0.1406	0.1386
Common Equity Tier 1 Capital (%)	0.133	0.1358

Financial Risk Management_Natur

Financial Risk Management_Nature And Extent Of Risks Arising From Financial Instruments(Details)	12 Months Ended
	Dec. 31, 2020
Credit Risk Member [Domain]
Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments Line Items [Line Items]
Description Of Exposure To Risk	Credit risk is the risk of loss from the portfolio of assets held due to the counterparty's default, breach of contract and deterioration of credit quality. For risk management reporting purposes, the Group considers all factors of credit risk exposure, such as default risk of individual borrowers, country risk and risk of specific sectors.
Description Of Objectives Policies And Processes For Managing Risk	The Group allocates and manages credit risk economic capital limits. In addition, to prevent excessive concentration of exposures by borrower and industry, the total exposure limit at the Group level is introduced, applied, and managed to control the credit concentration risk. In order to establish a credit risk management system, the Group manages credit risk by forming a separate risk management organization. In particular, independent of the Sales Group, the Credit Analysis Group of Kookmin Bank, a subsidiary, is in charge of loan policy, loan system, credit rating, credit analysis, follow-up management and corporate restructuring. The Risk Management Group of Kookmin Bank is responsible for establishing policies on credit risk management, measuring and limiting economic capital of credit risk, setting credit limits, credit review, and verification of credit rating models.
Methods Used To Measure Risk	The Group measures the expected loss and economic capital for the assets subject to credit risk management, including on-balance and off-balance assets, and uses them as management indicators.
Liquidity Risk Member [Member]
Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments Line Items [Line Items]
Description Of Exposure To Risk	Liquidity risk is a risk that the Group becomes insolvent due to the mismatch between the inflow and outflow of funds, unexpected cash outflows, or a risk of loss due to financing funds at a high interest rate or disposing of securities at an unfavorable price due to lack of available funds. The Group manages its liquidity risk through analysis of the contractual maturity of interest-bearing assets and liabilities, assets and liabilities related to the other inflows and outflows of funds, and off-balance sheet items related to the inflows and outflows of funds such as currency derivative instruments and others.
Description Of Objectives Policies And Processes For Managing Risk	The liquidity risk is managed by risk management policies and liquidity risk management guidelines set forth in these policies applied to all risk management policies and procedures that may arise throughout the overall business of the Group.
Methods Used To Measure Risk	The Group calculates and manages cumulative liquidity gaps and liquidity ratio for all transactions and off-balance transactions, that affect the cashflows in Korean won and foreign currency funds raised and operated for the management of liquidity risks and periodically reports them to the Risk Management Council and the Risk Management Committee.
Market Risk Member [Member]
Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments Line Items [Line Items]
Description Of Exposure To Risk	Market risk refers to risks that can result in losses due to changes in market factors such as interest rates, stock prices, and exchange rates etc., which arise from securities and derivatives and others. The most significant risks associated with trading position are interest rate risk and currency risk, and additional risks include stock price risk. The non-trading position is also exposed to interest rate risk. The Group manages the market risks by dividing them into those arising from the trading position and those arising from the non-trading position. The above market risks are measured and managed by subsidiaries.
Description Of Objectives Policies And Processes For Managing Risk	The Group sets and monitors internal capital limits for market and interest rate risk to manage the risks of trading and non-trading positions. In order to manage market risk efficiently, the Group maintains risk management systems and procedures such as trading policies and procedures, market risk management guidelines for trading positions, and interest rate risk management guidelines for non-trading positions. The entire process is carried out through consultation with the Risk Management Council and approval of the Risk Management Committee of the Group. In case of Kookmin Bank, a major subsidiary, the Risk Management Council establishes and enforces overall market risk management policies for market risk management and decides to establish position limits, loss limits, VaR limits, and approves non-standard new products. In addition, the Market Risk Management Committee, chaired by Chief Risk Officer ("CRO"), is a practical decision-making body for market risk management and determines position limits, loss limits, VaR limits, sensitivity limits, and scenario loss limits for each department of business group.
Methods Used To Measure Risk	Definition of a trading position The trading position, which is subject to market risk management, is the trading position defined in "Trading Policy and Guidelines" and the basic requirements for the trading position are as follows: - The target position has no restrictions on the sale, and the daily fair value assessment should be made and the embedded significant risk can be hedged in the market. - The trading position classification criteria should be clearly defined in the Trading Policy and Guidelines, and the trading position should be managed by a separate trading department. - The target position must be operated according to the documented trading strategy and the position's limit management must be carried out. - The specialized dealer or operating department shall have the authority to execute the transaction without prior approval from the Risk Management Department, etc. within the pre-determined limits of the target position. - Target positions should be periodically reported to management for risk management of the Group. Observation method on market risk arising from trading positions Subsidiaries of the Group measures market risk by calculating VaR through the market risk management system for all trading positions. Generally, the Group manages market risks arising from trading positions at the portfolio level. In addition, the Group controls and manages the risk of derivative financial instrument transactions in accordance with the Financial Supervisory Service regulations and guidelines.
Currency Risk [Member]
Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments Line Items [Line Items]
Description Of Exposure To Risk	Foreign exchange rate risk arises from holding assets, liabilities and currency-related derivatives which are denominated in foreign currency. Most of the net foreign currency exposures occur in the US dollars and the Chinese Yuan.
Methods Used To Measure Risk	The Group also manages net foreign exchange exposures across trading and non-trading portfolios by setting a net foreign currency exposure limit at the same time setting a loss limit.
Interest Rate Risk Member [Member]
Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments Line Items [Line Items]
Description Of Exposure To Risk	The interest rate risk for trading positions usually arises from debt securities denominated in Korean won. The Group's trading strategy is to gain short-term trading gains from interest rate fluctuations. Interest rate risk management targets for non-trading positions include both on-balance and off-balance assets, liabilities and derivatives that are sensitive to interest rate, except for trading positions that are subject to market risk measurement. Interest-sensitive assets and liabilities refer to interest-bearing assets and liabilities that generate interest income and interest expenses.
Methods Used To Measure Risk	The Group manages interest rate risks associated with trading accounts using VaR and sensitivity analysis (Price Value of a Basis Point: PVBP).
Other Price Risk Member [Member]
Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments Line Items [Line Items]
Description Of Exposure To Risk	Stock price risk occurs only in trading stocks denominated in Korean won because there are no trading stocks denominated in foreign currency.
Methods Used To Measure Risk	The portfolio of trading stocks denominated in Korean won consists of stocks listed on the exchange and derivatives linked to stocks and is managed by strict distributed investment limits.
Risk Diversification Effect Member [Member]
Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments Line Items [Line Items]
Description Of Exposure To Risk	The Group defines operational risks broadly as all financial and non-financial risks from operating activities that negatively affect capital.
Description Of Objectives Policies And Processes For Managing Risk	The purpose of operational risk management is not only to comply with supervisory and regulatory requirements, but also to spread risk management culture, strengthen internal control, improve processes and provide timely feedback to management and all employees. Kookmin Bank, a subsidiary, established a Business Continuity Planning (BCP) to carry out continuous work in emergency situations and established alternative facilities. The Group conducts simulation training for headquarters and IT departments to check the business continuity framework.

Segment Information_Operating S

Segment Information_Operating Segments(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)		Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)		Dec. 31, 2018KRW (₩)	Dec. 31, 2020USD ($)
Disclosure Of Operating Segments Line Items [Line Items]
Operating revenues from external customers		₩ 12,492,642			₩ 11,431,851		₩ 10,859,687
Intersegment operating revenues (expenses)		0			0
Sub-total		12,492,642			11,431,851
Net interest income	[1]	9,722,274		$ 8,951,463	9,196,787		8,904,928
Interest income	[1]	14,485,747		13,337,275	14,639,187		13,734,569
Interest expense	[1]	(4,763,473)		(4,385,812)	(5,442,400)		(4,829,641)
Net fee and commission income (expense)	[1]	2,958,939		2,724,346	2,355,004		2,243,376
Fee and commission income	[1]	4,527,024		4,168,109	3,879,247		3,717,720
Fee and commission expense	[1]	(1,568,085)		(1,443,763)	(1,524,243)		(1,474,344)
Net insurance income (expenses)	[1]	299,993		276,209	299,512		490,116
Insurance income	[1]	14,386,640		13,246,025	12,317,182		11,975,070
Insurance expense	[1]	(14,086,647)		(12,969,816)	(12,017,670)		(11,484,954)
Net gains (losses) on financial instruments at fair value through profit or loss	[1]	1,011,366		931,182	643,872		351,303
Net other operating income (expenses)	[1]	(1,499,930)		(1,381,011)	(1,063,324)		(1,130,036)
General and administrative expenses	[1]	(6,833,152)		(6,291,399)	(6,271,017)		(5,918,512)
Operating profit before provision for credit losses	[1]	5,659,490		5,210,790	5,160,834		4,941,175
Reversal (provision) for credit losses	[1],[2]	(1,043,498)		(960,767)	(670,185)		(673,694)
Net operating income	[1]	4,615,992		4,250,023	4,490,649		4,267,481
Share of profit (loss) of associates and joint ventures	[1],[2]	(43,750)		(40,281)	16,451		24,260
Net other non-operating income (expenses)	[1]	189,390		174,374	26,886		9,791
Segment profits before income tax	[1]	4,761,632		4,384,116	4,533,986		4,301,532
Income tax expense	[1]	(1,259,351)		(1,159,506)	(1,220,787)		(1,239,586)
Profit for the year	[1],[2],[3]	3,502,281		3,224,610	3,313,199		3,061,946
Profit attributable to shareholders of the Parent Company	[1]	3,455,151		3,181,217	3,311,828		3,061,191
Profit (loss) attributable to non-controlling interests	[1]	47,130		$ 43,393	1,371		755
Total assets		610,672,192	[4]		518,538,117	[4]		$ 562,256,302
Total liabilities		567,310,733	[4]		479,418,792	[4]		$ 522,332,667
Banking business
Disclosure Of Operating Segments Line Items [Line Items]
Operating revenues from external customers		7,550,348			6,946,626		6,579,169
Intersegment operating revenues (expenses)		286,317			372,442
Sub-total		7,836,665			7,319,068
Net interest income		6,754,766			6,363,787
Interest income		10,456,165			10,779,948
Interest expense		(3,701,399)			(4,416,161)
Net fee and commission income (expense)		1,067,922			1,133,296
Fee and commission income		1,449,687			1,483,362
Fee and commission expense		(381,765)			(350,066)
Net insurance income (expenses)		0			0
Insurance income		0			0
Insurance expense		0			0
Net gains (losses) on financial instruments at fair value through profit or loss		244,183			422,624
Net other operating income (expenses)		(230,206)			(600,639)
General and administrative expenses		(4,201,346)			(3,887,419)
Operating profit before provision for credit losses		3,635,319			3,431,649
Reversal (provision) for credit losses		(484,182)			(103,530)
Net operating income		3,151,137			3,328,119
Share of profit (loss) of associates and joint ventures		(48,158)			29,240
Net other non-operating income (expenses)		28,844			(38,887)
Segment profits before income tax		3,131,823			3,318,472
Income tax expense		(812,304)			(879,393)
Profit for the year		2,319,519			2,439,079
Profit attributable to shareholders of the Parent Company		2,298,195			2,439,079
Profit (loss) attributable to non-controlling interests		21,324			0
Total assets	[4]	438,444,114			387,425,038
Total liabilities	[4]	408,036,040			358,420,805
Corporate Banking
Disclosure Of Operating Segments Line Items [Line Items]
Operating revenues from external customers		2,833,601			2,375,800
Intersegment operating revenues (expenses)		178,199			204,476
Sub-total		3,011,800			2,580,276
Net interest income		3,238,002			2,844,880
Interest income		4,899,943			4,642,555
Interest expense		(1,661,941)			(1,797,675)
Net fee and commission income (expense)		363,459			349,393
Fee and commission income		480,190			459,879
Fee and commission expense		(116,731)			(110,486)
Net insurance income (expenses)		0			0
Insurance income		0			0
Insurance expense		0			0
Net gains (losses) on financial instruments at fair value through profit or loss		(52,493)			(2,526)
Net other operating income (expenses)		(537,168)			(611,471)
General and administrative expenses		(1,555,089)			(1,241,721)
Operating profit before provision for credit losses		1,456,711			1,338,555
Reversal (provision) for credit losses		(204,302)			125,919
Net operating income		1,252,409			1,464,474
Share of profit (loss) of associates and joint ventures		0			0
Net other non-operating income (expenses)		5,490			(262)
Segment profits before income tax		1,257,899			1,464,212
Income tax expense		(339,728)			(404,426)
Profit for the year		918,171			1,059,786
Profit attributable to shareholders of the Parent Company		917,956			1,059,786
Profit (loss) attributable to non-controlling interests		215			0
Total assets	[4]	164,323,181			139,496,393
Total liabilities	[4]	167,236,387			142,063,122
Retail Banking
Disclosure Of Operating Segments Line Items [Line Items]
Operating revenues from external customers		2,918,826			2,979,503
Intersegment operating revenues (expenses)		0			0
Sub-total		2,918,826			2,979,503
Net interest income		3,178,280			3,148,061
Interest income		4,519,579			4,872,937
Interest expense		(1,341,299)			(1,724,876)
Net fee and commission income (expense)		406,603			471,869
Fee and commission income		529,178			577,845
Fee and commission expense		(122,575)			(105,976)
Net insurance income (expenses)		0			0
Insurance income		0			0
Insurance expense		0			0
Net gains (losses) on financial instruments at fair value through profit or loss		0			0
Net other operating income (expenses)		(666,057)			(640,427)
General and administrative expenses		(2,072,515)			(1,982,375)
Operating profit before provision for credit losses		846,311			997,128
Reversal (provision) for credit losses		(264,943)			(235,995)
Net operating income		581,368			761,133
Share of profit (loss) of associates and joint ventures		0			0
Net other non-operating income (expenses)		0			0
Segment profits before income tax		581,368			761,133
Income tax expense		(159,876)			(209,311)
Profit for the year		421,492			551,822
Profit attributable to shareholders of the Parent Company		421,492			551,822
Profit (loss) attributable to non-controlling interests		0			0
Total assets	[4]	161,330,053			147,468,173
Total liabilities	[4]	176,571,944			161,834,984
Other Banking Services
Disclosure Of Operating Segments Line Items [Line Items]
Operating revenues from external customers		1,797,921			1,591,323
Intersegment operating revenues (expenses)		108,118			167,966
Sub-total		1,906,039			1,759,289
Net interest income		338,484			370,846
Interest income		1,036,643			1,264,456
Interest expense		(698,159)			(893,610)
Net fee and commission income (expense)		297,860			312,034
Fee and commission income		440,319			445,638
Fee and commission expense		(142,459)			(133,604)
Net insurance income (expenses)		0			0
Insurance income		0			0
Insurance expense		0			0
Net gains (losses) on financial instruments at fair value through profit or loss		296,676			425,150
Net other operating income (expenses)		973,019			651,259
General and administrative expenses		(573,742)			(663,323)
Operating profit before provision for credit losses		1,332,297			1,095,966
Reversal (provision) for credit losses		(14,937)			6,546
Net operating income		1,317,360			1,102,512
Share of profit (loss) of associates and joint ventures		(48,158)			29,240
Net other non-operating income (expenses)		23,354			(38,625)
Segment profits before income tax		1,292,556			1,093,127
Income tax expense		(312,700)			(265,656)
Profit for the year		979,856			827,471
Profit attributable to shareholders of the Parent Company		958,747			827,471
Profit (loss) attributable to non-controlling interests		21,109			0
Total assets	[4]	112,790,880			100,460,472
Total liabilities	[4]	64,227,709			54,522,699
Securities
Disclosure Of Operating Segments Line Items [Line Items]
Operating revenues from external customers		1,448,409			1,113,200		997,898
Intersegment operating revenues (expenses)		(6,366)			(18,795)
Sub-total		1,442,043			1,094,405
Net interest income		510,566			529,888
Interest income		820,100			852,153
Interest expense		(309,534)			(322,265)
Net fee and commission income (expense)		916,758			580,435
Fee and commission income		1,037,545			683,600
Fee and commission expense		(120,787)			(103,165)
Net insurance income (expenses)		0			0
Insurance income		0			0
Insurance expense		0			0
Net gains (losses) on financial instruments at fair value through profit or loss		117,792			(103,815)
Net other operating income (expenses)		(103,073)			87,897
General and administrative expenses		(844,503)			(757,276)
Operating profit before provision for credit losses		597,540			337,129
Reversal (provision) for credit losses		(23,827)			(14,366)
Net operating income		573,713			322,763
Share of profit (loss) of associates and joint ventures		3,598			(103)
Net other non-operating income (expenses)		4,472			30,518
Segment profits before income tax		581,783			353,178
Income tax expense		(156,135)			(95,271)
Profit for the year		425,648			257,907
Profit attributable to shareholders of the Parent Company		425,622			257,893
Profit (loss) attributable to non-controlling interests		26			14
Total assets	[4]	57,570,654			47,816,512
Total liabilities	[4]	52,516,488			43,131,858
Non-life Insurance
Disclosure Of Operating Segments Line Items [Line Items]
Operating revenues from external customers		1,027,269			1,185,600		1,183,394
Intersegment operating revenues (expenses)		5,976			(54,160)
Sub-total		1,033,245			1,131,440
Net interest income		615,951			616,378
Interest income		616,852			617,617
Interest expense		(901)			(1,239)
Net fee and commission income (expense)		(171,220)			(152,597)
Fee and commission income		8,571			11,095
Fee and commission expense		(179,791)			(163,692)
Net insurance income (expenses)		376,827			415,112
Insurance income		12,367,894			11,375,543
Insurance expense		(11,991,067)			(10,960,431)
Net gains (losses) on financial instruments at fair value through profit or loss		259,274			265,187
Net other operating income (expenses)		(47,587)			(12,640)
General and administrative expenses		(829,263)			(843,800)
Operating profit before provision for credit losses		203,982			287,640
Reversal (provision) for credit losses		7,569			12,959
Net operating income		211,551			300,599
Share of profit (loss) of associates and joint ventures		(42)			(21)
Net other non-operating income (expenses)		16,142			26,490
Segment profits before income tax		227,651			327,068
Income tax expense		(63,778)			(92,381)
Profit for the year		163,873			234,687
Profit attributable to shareholders of the Parent Company		163,884			234,326
Profit (loss) attributable to non-controlling interests		(11)			361
Total assets	[4]	39,078,117			36,552,368
Total liabilities	[4]	35,086,458			32,689,460
Credit Card
Disclosure Of Operating Segments Line Items [Line Items]
Operating revenues from external customers		1,538,230			1,470,910		1,524,695
Intersegment operating revenues (expenses)		(183,480)			(209,874)
Sub-total		1,354,750			1,261,036
Net interest income		1,265,703			1,230,288
Interest income		1,631,520			1,581,178
Interest expense		(365,817)			(350,890)
Net fee and commission income (expense)		400,485			261,829
Fee and commission income		1,485,718			1,406,273
Fee and commission expense		(1,085,233)			(1,144,444)
Net insurance income (expenses)		13,283			15,748
Insurance income		23,989			28,874
Insurance expense		(10,706)			(13,126)
Net gains (losses) on financial instruments at fair value through profit or loss		5,904			371
Net other operating income (expenses)		(330,625)			(247,200)
General and administrative expenses		(514,845)			(441,921)
Operating profit before provision for credit losses		839,905			819,115
Reversal (provision) for credit losses		(396,376)			(439,765)
Net operating income		443,529			379,350
Share of profit (loss) of associates and joint ventures		1,127			1,106
Net other non-operating income (expenses)		(6,636)			3,362
Segment profits before income tax		438,020			383,818
Income tax expense		(114,027)			(67,262)
Profit for the year		323,993			316,556
Profit attributable to shareholders of the Parent Company		324,662			316,545
Profit (loss) attributable to non-controlling interests		(669)			11
Total assets	[4]	24,071,645			22,990,115
Total liabilities	[4]	19,789,959			18,925,195
Life Insurance
Disclosure Of Operating Segments Line Items [Line Items]
Operating revenues from external customers		237,416			107,404		113,238
Intersegment operating revenues (expenses)		(9,655)			(22,742)
Sub-total		227,761			84,662
Net interest income		260,925			159,248
Interest income		261,056			159,463
Interest expense		(131)			(215)
Net fee and commission income (expense)		(18,059)			(16,792)
Fee and commission income		98			239
Fee and commission expense		(18,157)			(17,031)
Net insurance income (expenses)		(91,410)			(122,295)
Insurance income		2,026,052			942,662
Insurance expense		(2,117,462)			(1,064,957)
Net gains (losses) on financial instruments at fair value through profit or loss		71,350			66,773
Net other operating income (expenses)		4,955			(2,272)
General and administrative expenses		(152,271)			(66,514)
Operating profit before provision for credit losses		75,490			18,148
Reversal (provision) for credit losses		472			3,084
Net operating income		75,962			21,232
Share of profit (loss) of associates and joint ventures		1			0
Net other non-operating income (expenses)		(16,270)			(30)
Segment profits before income tax		59,693			21,202
Income tax expense		(27,167)			(5,238)
Profit for the year		32,526			15,964
Profit attributable to shareholders of the Parent Company		32,526			15,964
Profit (loss) attributable to non-controlling interests		0			0
Total assets	[4]	35,546,572			9,801,904
Total liabilities	[4]	32,524,518			9,186,567
Others
Disclosure Of Operating Segments Line Items [Line Items]
Operating revenues from external customers		690,970			608,111		₩ 461,293
Intersegment operating revenues (expenses)		324,910			124,857
Sub-total		1,015,880			732,968
Net interest income		314,832			296,512
Interest income		726,668			687,823
Interest expense		(411,836)			(391,311)
Net fee and commission income (expense)		776,282			541,343
Fee and commission income		871,499			617,622
Fee and commission expense		(95,217)			(76,279)
Net insurance income (expenses)		0			0
Insurance income		0			0
Insurance expense		0			0
Net gains (losses) on financial instruments at fair value through profit or loss		396,626			137,680
Net other operating income (expenses)		(471,860)			(242,567)
General and administrative expenses		(405,530)			(373,919)
Operating profit before provision for credit losses		610,350			359,049
Reversal (provision) for credit losses		(148,127)			(128,331)
Net operating income		462,223			230,718
Share of profit (loss) of associates and joint ventures		553			7,201
Net other non-operating income (expenses)		40,927			34,644
Segment profits before income tax		503,703			272,563
Income tax expense		(97,268)			(90,366)
Profit for the year		406,435			182,197
Profit attributable to shareholders of the Parent Company		404,381			179,783
Profit (loss) attributable to non-controlling interests		2,054			2,414
Total assets	[4]	47,408,052			42,140,936
Total liabilities	[4]	21,598,232			18,675,585
Adjustments For Reportable Segments
Disclosure Of Operating Segments Line Items [Line Items]
Operating revenues from external customers		0			0
Intersegment operating revenues (expenses)		(417,702)			(191,728)
Sub-total		(417,702)			(191,728)
Net interest income		(469)			686
Interest income		(26,614)			(38,995)
Interest expense		26,145			39,681
Net fee and commission income (expense)		(13,229)			7,490
Fee and commission income		(326,094)			(322,944)
Fee and commission expense		312,865			330,434
Net insurance income (expenses)		1,293			(9,053)
Insurance income		(31,295)			(29,897)
Insurance expense		32,588			20,844
Net gains (losses) on financial instruments at fair value through profit or loss		(83,763)			(144,948)
Net other operating income (expenses)		(321,534)			(45,903)
General and administrative expenses		114,606			99,832
Operating profit before provision for credit losses		(303,096)			(91,896)
Reversal (provision) for credit losses		973			(236)
Net operating income		(302,123)			(92,132)
Share of profit (loss) of associates and joint ventures		(829)			(20,972)
Net other non-operating income (expenses)		121,911			(29,211)
Segment profits before income tax		(181,041)			(142,315)
Income tax expense		11,328			9,124
Profit for the year		(169,713)			(133,191)
Profit attributable to shareholders of the Parent Company		(194,119)			(131,762)
Profit (loss) attributable to non-controlling interests		24,406			(1,429)
Total assets	[4]	(31,446,962)			(28,188,756)
Total liabilities	[4]	₩ (2,240,962)			₩ (1,610,678)
[1]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	The consolidated statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[3]	The consolidated statements of changes in equity for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[4]	Assets and liabilities of the reporting segments are amounts before intersegment transactions.

Segment Information_Operating R

Segment Information_Operating Revenues From External Customers For Each Service(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Revenes From External Customers For Each Service Line Items [Line Items]
Operating Revenes From External Customers	₩ 12,492,642	₩ 11,431,851	₩ 10,859,687
Banking service
Operating Revenes From External Customers For Each Service Line Items [Line Items]
Operating Revenes From External Customers	7,550,348	6,946,626	6,579,169
Securities service
Operating Revenes From External Customers For Each Service Line Items [Line Items]
Operating Revenes From External Customers	1,448,409	1,113,200	997,898
Non-life insurance service
Operating Revenes From External Customers For Each Service Line Items [Line Items]
Operating Revenes From External Customers	1,027,269	1,185,600	1,183,394
Credit card service
Operating Revenes From External Customers For Each Service Line Items [Line Items]
Operating Revenes From External Customers	1,538,230	1,470,910	1,524,695
Life insurance service
Operating Revenes From External Customers For Each Service Line Items [Line Items]
Operating Revenes From External Customers	237,416	107,404	113,238
Other service
Operating Revenes From External Customers For Each Service Line Items [Line Items]
Operating Revenes From External Customers	₩ 690,970	₩ 608,111	₩ 461,293

Segment Information_Geographica

Segment Information_Geographical Operating Revenues From External Customers(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Geographical Areas Line Items [Line Items]
Revenues from external customers	₩ 12,492,642	₩ 11,431,851	₩ 10,859,687
Major non-current assets	11,318,226	10,633,178
Domestic
Disclosure Of Geographical Areas Line Items [Line Items]
Revenues from external customers	11,891,540	11,142,264	10,666,586
Major non-current assets	10,603,254	9,515,220
United States
Disclosure Of Geographical Areas Line Items [Line Items]
Revenues from external customers	114,044	72,945	46,391
Major non-current assets	45,353	386,724
New Zealand
Disclosure Of Geographical Areas Line Items [Line Items]
Revenues from external customers	3,554	6,946	6,213
Major non-current assets	2,385	3,516
China
Disclosure Of Geographical Areas Line Items [Line Items]
Revenues from external customers	84,821	109,574	94,996
Major non-current assets	13,971	15,119
Cambodia
Disclosure Of Geographical Areas Line Items [Line Items]
Revenues from external customers	250,426	19,534	11,062
Major non-current assets	32,354	7,162
United Kingdom
Disclosure Of Geographical Areas Line Items [Line Items]
Revenues from external customers	28,681	10,037	8,119
Major non-current assets	81,879	85,634
Others
Disclosure Of Geographical Areas Line Items [Line Items]
Revenues from external customers	119,576	70,551	26,320
Major non-current assets	51,288	551,039
Consolidation adjustments
Disclosure Of Geographical Areas Line Items [Line Items]
Revenues from external customers	0	0	₩ 0
Major non-current assets	₩ 487,742	₩ 68,764

Financial Assets and Financia_3

Financial Assets and Financial Liabilities_Carrying Amount And Fair Value Of Financial Assets And Liabilities(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		₩ 582,219,781		₩ 498,191,361
Fair value		585,003,881		500,565,482
Financial Assets Measured At Fair Value		128,406,037		103,175,810
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		456,597,843		397,389,672
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Carrying amount		496,813,305		435,352,295
Fair value		497,750,058		436,421,064
Financial Liabilities Measured At Fair Value		17,032,955		18,375,494
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed		480,717,103		418,045,570
Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		33,330,288		26,439,692
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		22,801,037		12,602,874
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		2,231,461		2,821,453
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed		0		0
Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		80,957,228		63,821,636
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		38,428,580		31,165,284
Reasonable Approximation Of Fair Value Financial Assets		18,855,505		17,352,644
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		5,458,616		4,105,191
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed		240,538,815		190,461,055
Financial Liabilities Whose Fair Values Are Disclosed And Classified As Level2 And Level3		59,065,677		48,435,570
Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		14,118,521	[1]	12,914,482
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		395,368,226		353,621,514
Financial Assets Whose Fair Values Are Disclosed And Classified As Level2 And Level3		381,200,537		344,474,455
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		9,342,878	[1]	11,448,850
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed		240,178,288		227,584,515
Financial Liabilities Whose Fair Values Are Disclosed And Classified As Level2 And Level3		211,566,001		204,954,928
Financial liabilities at fair value through profit or loss
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Carrying amount		2,025,951		2,663,327
Fair value		2,025,951		2,663,327
Financial Liabilities Measured At Fair Value		2,025,951		2,663,327
Financial liabilities at fair value through profit or loss | Level 1
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		2,025,951		2,663,327
Financial liabilities at fair value through profit or loss | Level 2
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		0		0
Financial liabilities at fair value through profit or loss | Level 3
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		0	[1]	0
Financial liabilities designated at fair value through profit or loss
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Carrying amount		9,784,107		12,704,826
Fair value		9,784,107		12,704,826
Financial Liabilities Measured At Fair Value		₩ 9,784,107		12,704,826
Description Of Valuation Processes Used In Fair Value Measurement Liabilities		For exchange traded derivatives, quoted price in an active market is used to determine fair value and for OTC derivatives, fair value is determined using valuation techniques. The Group uses internally developed valuation models that are widely used by market participants to determine fair values of plain vanilla OTC derivatives including options, interest rate swaps, and currency swaps, based on observable market parameters. However, some complex financial instruments are valued using appropriate models developed from generally accepted market valuation models including the Finite Difference Method ("FDM"), the MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Closed Form and Tree Model or valuation results from independent external professional valuation institution.
Financial liabilities designated at fair value through profit or loss | Level 1
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		₩ 1,040		492
Financial liabilities designated at fair value through profit or loss | Level 2
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		₩ 581,636		₩ 1,482,302
Valuation techniques		DCF Model, Closed Form, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Binomial Model and others		DCF Model, Closed Form, Monte Carlo Simulation, Black-Scholes Model, Hull and White Model and others
Inputs		Price of underlying asset, Interest rate, Dividend yield, Volatility, Discount rate and others		Price of underlying asset, Interest rate, Dividend yield, Volatility, Discount rate and others
Financial liabilities designated at fair value through profit or loss | Level 3
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		₩ 9,201,431	[1]	₩ 11,222,032
Derivatives held for trading
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Carrying amount		5,014,072		2,842,950
Fair value		5,014,072		2,842,950
Financial Liabilities Measured At Fair Value		₩ 5,014,072		2,842,950
Description Of Valuation Processes Used In Fair Value Measurement Liabilities		For exchange traded derivatives, quoted price in an active market is used to determine fair value and for OTC derivatives, fair value is determined using valuation techniques. The Group uses internally developed valuation models that are widely used by market participants to determine fair values of plain vanilla OTC derivatives including options, interest rate swaps, and currency swaps, based on observable market parameters. However, some complex financial instruments are valued using appropriate models developed from generally accepted market valuation models including the Finite Difference Method ("FDM"), the MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Closed Form and Tree Model or valuation results from independent external professional valuation institution.
Derivatives held for trading | Level 1
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		₩ 204,470		157,634
Derivatives held for trading | Level 2
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		₩ 4,668,155		₩ 2,458,498
Valuation techniques		DCF Model, Closed Form, FDM, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model and others		DCF Model, Closed Form, FDM, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Option Model, FDM and others
Inputs		Discount rate, Price of underlying asset, Volatility, Interest rate, Stock price, Foreign exchange rate, Dividend yield and others		Discount rate, Underlying asset Index, Volatility, Correlation coefficient, Interest rate, Stock price, Foreign exchange rate, Dividend yield, Probability of default (PD), Credit spread and others
Derivatives held for trading | Level 3
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		₩ 141,447	[1]	₩ 226,818
Derivatives held for hedging
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Carrying amount		208,825		164,391
Fair value		208,825		164,391
Financial Liabilities Measured At Fair Value		₩ 208,825		164,391
Description Of Valuation Processes Used In Fair Value Measurement Liabilities		For exchange traded derivatives, quoted price in an active market is used to determine fair value and for OTC derivatives, fair value is determined using valuation techniques. The Group uses internally developed valuation models that are widely used by market participants to determine fair values of plain vanilla OTC derivatives including options, interest rate swaps, and currency swaps, based on observable market parameters. However, some complex financial instruments are valued using appropriate models developed from generally accepted market valuation models including the Finite Difference Method ("FDM"), the MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Closed Form and Tree Model or valuation results from independent external professional valuation institution.
Derivatives held for hedging | Level 1
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		₩ 0		0
Derivatives held for hedging | Level 2
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		₩ 208,825		₩ 164,391
Valuation techniques		DCF Model, Closed Form, FDM and others		DCF Model, Closed Form, FDM and others
Inputs		Discount rate, Foreign exchange rate and others		Discount rate, Volatility, Foreign exchange rate and others
Derivatives held for hedging | Level 3
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Measured At Fair Value		₩ 0	[1]	₩ 0
Deposits
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Carrying amount		338,580,220		305,592,771
Fair value		338,833,784		306,048,291
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[2]	₩ 338,833,784		306,048,291
Description Of Valuation Processes Used In Fair Value Measurement Liabilities		Carrying amount of demand deposits is regarded as representative of fair value because they do not have a fixed maturity and are payable on demand. Fair value of time deposits is determined using a DCF model. Fair value is determined by discounting the expected cash flows, which are contractual cash flows adjusted by the expected prepayment rate, at an appropriate discount rate.
Deposits | Level 1
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[2]	₩ 0		0
Deposits | Level 2
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[2]	181,472,846		142,021,800
Deposits | Level 3
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[2]	157,360,938		164,026,491
Financial Liabilities Whose Fair Values Are Disclosed And Classified As Level2 And Level3		₩ 157,360,938		₩ 164,026,491
Valuation techniques		DCF Model		DCF Model
Inputs		Other spread, Prepayment rate, Interest rate		Other spread, Prepayment rate, Interest rate
Borrowings
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Carrying amount		₩ 49,827,156		₩ 37,818,860
Fair value		50,081,900		37,808,944
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[3]	₩ 50,081,900		37,808,944
Description Of Valuation Processes Used In Fair Value Measurement Liabilities		Carrying amount of overdraft in foreign currency is regarded as representative of fair value because they do not have a fixed maturity and are payable on demand. Fair value of other debts is determined using a DCF model discounting contractual future cash flows at an appropriate discount rate.
Borrowings | Level 1
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[3]	₩ 0		0
Borrowings | Level 2
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[3]	1,149,734		1,469,263
Reasonable Approximation Of Fair Value Financial Liabilities		292		4,685
Financial Liabilities Whose Fair Values Are Disclosed And Classified As Level2 And Level3		₩ 1,149,442		₩ 1,464,578
Valuation techniques		DCF Model		DCF Model
Inputs		Discount rate		Discount rate
Borrowings | Level 3
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[3]	₩ 48,932,166		₩ 36,339,681
Financial Liabilities Whose Fair Values Are Disclosed And Classified As Level2 And Level3		₩ 48,932,166		₩ 36,339,681
Valuation techniques		DCF Model		DCF Model
Inputs		Other spread, Interest rate		Other spread, Interest rates
Debentures
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Carrying amount		₩ 62,760,687		₩ 50,935,583
Fair value		63,189,132		51,558,748
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed		₩ 63,189,132		51,558,748
Description Of Valuation Processes Used In Fair Value Measurement Liabilities		Fair value is determined by using the valuation results of external professional valuation institution, which are calculated using market inputs.
Debentures | Level 1
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed		₩ 0		0
Debentures | Level 2
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed		57,916,235		46,969,992
Financial Liabilities Whose Fair Values Are Disclosed And Classified As Level2 And Level3		₩ 57,916,235		₩ 46,969,992
Valuation techniques		DCF Model		DCF Model
Inputs		Discount rate		Discount rate
Debentures | Level 3
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed		₩ 5,272,897		₩ 4,588,756
Financial Liabilities Whose Fair Values Are Disclosed And Classified As Level2 And Level3		₩ 5,272,897		₩ 4,588,756
Valuation techniques		DCF Model		DCF Model
Inputs		Other spread, Interest rate		Other spread, Interest rates
Other financial liabilities
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Carrying amount		₩ 28,612,287		₩ 22,629,587
Fair value		28,612,287		22,629,587
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[4]	₩ 28,612,287		22,629,587
Description Of Valuation Processes Used In Fair Value Measurement Liabilities		Carrying amounts are reasonable approximation of fair values. These financial instruments are temporary accounts used for other various transactions and their maturities are relatively short or not defined.
Other financial liabilities | Level 1
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[4]	₩ 0		0
Other financial liabilities | Level 2
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[4]	0		0
Other financial liabilities | Level 3
Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items]
Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed	[4]	28,612,287		22,629,587
Cash and due from financial institutions
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		25,608,842		20,837,878
Fair value		25,612,273		20,835,235
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed	[2]	₩ 25,612,273		20,835,235
Description Of Valuation Processes Used In Fair Value Measurement Assets		Carrying amounts of cash and demand due from financial institutions and payment due from financial institutions are reasonable approximation of fair values. These financial instruments do not have a fixed maturity and are receivable on demand. Fair value of ordinary due from financial institutions is measured using Discounted Cash Flow ("DCF") Model.
Cash and due from financial institutions | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed	[2]	₩ 3,362,096		3,015,104
Cash and due from financial institutions | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed	[2]	19,573,075		13,812,640
Cash and due from financial institutions | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed	[2]	2,677,102		4,007,491
Financial Assets Whose Fair Values Are Disclosed And Classified As Level2 And Level3		₩ 2,677,102		₩ 4,007,491
Valuation techniques		DCF Model		DCF Model
Inputs		Credit spread, Other spread, Interest rates		Credit spread, Other spread, Interest rates
Financial assets at fair value through profit or loss
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		₩ 61,035,455		₩ 53,549,086
Fair value		61,035,455		53,549,086
Financial Assets Measured At Fair Value		₩ 61,035,455		53,549,086
Description Of Valuation Processes Used In Fair Value Measurement Assets		Fair value of financial instruments that are quoted in active markets is determined using the quoted prices. If there is no quoted price, fair value is determined using external professional valuation institution. The institutions use one or more of the following valuation techniques including DCF Model, Free Cash Flow to Equity Model, Comparable Company Analysis, Dividend Discount Model, Risk Adjusted Discount Rate Method, and Net Asset Value Method, deemed suitable considering the characteristics of the financial instruments.
Financial assets at fair value through profit or loss | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 14,508,028		11,177,716
Financial assets at fair value through profit or loss | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		35,298,665		31,476,070
Financial assets at fair value through profit or loss | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		11,228,762	[1]	10,895,300
Due from financial institutions measured at fair value through profit or loss
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		100,094		216,367
Fair value		100,094		216,367
Financial Assets Measured At Fair Value		100,094		216,367
Due from financial institutions measured at fair value through profit or loss | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		0		0
Due from financial institutions measured at fair value through profit or loss | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 10,011		₩ 165,242
Valuation techniques		DCF Model		DCF Model, One factor Hull-White Model,
Inputs		Projected cash flow, Discount rate		Discount rate, Volatility and others
Due from financial institutions measured at fair value through profit or loss | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 90,083	[1]	₩ 51,125
Debt securities
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		58,415,100		50,721,526
Fair value		58,415,100		50,721,526
Financial Assets Measured At Fair Value		58,415,100		50,721,526
Debt securities | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		13,316,819		9,853,733
Debt securities | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 34,580,168		₩ 30,735,027
Valuation techniques		DCF Model, Closed Form, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Net Asset Value Method and others		DCF Model, Closed Form, Option Model, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Net Asset Value Method and others
Inputs		Projected cash flow, Fair value of underlying asset, Dividend yield, Price of underlying asset, Interest rate, Discount rate, Volatility, Correlation coefficient and others		Projected cash flow, Fair value of underlying asset, Dividend yield, Price of underlying asset, Interest rate, Discount rate, Volatility, Correlation coefficient and others
Debt securities | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 10,518,113	[1]	₩ 10,132,766
Equity securities
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		2,092,313		2,103,843
Fair value		2,092,313		2,103,843
Financial Assets Measured At Fair Value		2,092,313		2,103,843
Equity securities | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		1,101,244		1,244,178
Equity securities | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 409,259		₩ 336,389
Valuation techniques		DCF Model		DCF Model
Inputs		Interest rate, Discount rate and others		Interest rate, Discount rate and others
Equity securities | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 581,810	[1]	₩ 523,276
Loans measured at fair value through profit or loss
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		337,983		427,545
Fair value		337,983		427,545
Financial Assets Measured At Fair Value		337,983		427,545
Loans measured at fair value through profit or loss | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		0		0
Loans measured at fair value through profit or loss | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 299,227		₩ 239,412
Valuation techniques		DCF Model		DCF Model
Inputs		Interest rate, Discount rate and others		Interest rate, Discount rate and others
Loans measured at fair value through profit or loss | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 38,756	[1]	₩ 188,133
Others
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		89,965		79,805
Fair value		89,965		79,805
Financial Assets Measured At Fair Value		89,965		79,805
Others | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		89,965		79,805
Others | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		0		0
Others | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		0	[1]	0
Derivatives held for trading
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		5,210,512		3,008,598
Fair value		5,210,512		3,008,598
Financial Assets Measured At Fair Value		₩ 5,210,512		3,008,598
Description Of Valuation Processes Used In Fair Value Measurement Assets		For exchange traded derivatives, quoted price in an active market is used to determine fair value and for OTC derivatives, fair value is determined using valuation techniques. The Group uses internally developed valuation models that are widely used by market participants to determine fair values of plain vanilla OTC derivatives including options, interest rate swaps, and currency swaps, based on observable market parameters. However, some complex financial instruments are valued using appropriate models developed from generally accepted market valuation models including the Finite Difference Method ("FDM"), the MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Closed Form and Tree Model or valuation results from independent external professional valuation institution.
Derivatives held for trading | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 90,459		72,983
Derivatives held for trading | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 4,678,185		₩ 2,398,831
Valuation techniques		DCF Model, Closed Form, FDM, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model and others		DCF Model, Closed Form, FDM, Option Model, MonteCarlo Simulation, Black-Scholes Model, Hull and White Model and others
Inputs		Discount rate, Underlying asset Index, Volatility, Interest rate, Stock price, Foreign exchange rate, Dividend yield and others		Discount rate, Underlying asset Index, Volatility, Correlation coefficient, Interest rate, Stock price, Foreign exchange rate, Dividend yield, Probability of default (PD), Credit spread and others
Derivatives held for trading | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 441,868	[1]	₩ 536,784
Derivatives held for hedging
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		334,873		182,075
Fair value		334,873		182,075
Financial Assets Measured At Fair Value		₩ 334,873		182,075
Description Of Valuation Processes Used In Fair Value Measurement Assets		For exchange traded derivatives, quoted price in an active market is used to determine fair value and for OTC derivatives, fair value is determined using valuation techniques. The Group uses internally developed valuation models that are widely used by market participants to determine fair values of plain vanilla OTC derivatives including options, interest rate swaps, and currency swaps, based on observable market parameters. However, some complex financial instruments are valued using appropriate models developed from generally accepted market valuation models including the Finite Difference Method ("FDM"), the MonteCarlo Simulation, Black-Scholes Model, Hull and White Model, Closed Form and Tree Model or valuation results from independent external professional valuation institution.
Derivatives held for hedging | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 0		0
Derivatives held for hedging | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 334,873		₩ 182,075
Valuation techniques		DCF Model, Closed Form, FDM and others		DCF Model, Closed Form, FDM and others
Inputs		Discount rate, Volatility, Foreign exchange rate and others		Discount rate, Volatility, Foreign exchange rate and Others
Derivatives held for hedging | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 0	[1]	₩ 0
Loans measured at amortized cost
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		377,166,984		339,684,059
Fair value		378,791,808		340,836,884
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		₩ 378,791,808		340,836,884
Description Of Valuation Processes Used In Fair Value Measurement Assets		DCF model is used to determine the fair value of loans. Fair value is determined by discounting the expected cash flows, which are contractual cash flows adjusted by the expected prepayment rate, at an appropriate discount rate.
Loans measured at amortized cost | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		₩ 0		0
Loans measured at amortized cost | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		271,241		372,988
Financial Assets Whose Fair Values Are Disclosed And Classified As Level2 And Level3		₩ 271,241		₩ 372,988
Valuation techniques		DCF Model		DCF Model
Inputs		Discount rate		Discount rate
Loans measured at amortized cost | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		₩ 378,520,567		₩ 340,463,896
Financial Assets Whose Fair Values Are Disclosed And Classified As Level2 And Level3		₩ 378,520,567		₩ 340,463,896
Valuation techniques		DCF Model		DCF Model
Inputs		Credit spread, Other spread, Prepayment rate, Interest rate		Credit spread, Other spread, Prepayment rate, Interest rate
Securities measured at amortized cost
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		₩ 36,870,229		₩ 25,346,555
Fair value		38,026,073		26,570,494
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		₩ 38,026,073		26,570,494
Description Of Valuation Processes Used In Fair Value Measurement Assets		Fair value of financial instruments that are quoted in active markets is determined using the quoted prices. If there is no quoted price, fair value is determined using external professional valuation institution. The institutions use one or more of the following valuation techniques including DCF Model, Free Cash Flow to Equity Model, Comparable Company Analysis, Dividend Discount Model, Risk Adjusted Discount Rate Method, and Net Asset Value Method, deemed suitable considering the characteristics of the financial instruments.
Securities measured at amortized cost | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		₩ 19,438,941		9,587,770
Securities measured at amortized cost | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		18,584,264		16,979,656
Financial Assets Whose Fair Values Are Disclosed And Classified As Level2 And Level3		₩ 18,584,264		₩ 16,979,656
Valuation techniques		DCF Model, Monte Carlo Simulation		DCF Model, Monte Carlo Simulation
Inputs		Discount rate, Interest rate		Discount rate, Interest rate
Securities measured at amortized cost | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed		₩ 2,868		₩ 3,068
Financial Assets Whose Fair Values Are Disclosed And Classified As Level2 And Level3		₩ 2,868		₩ 3,068
Valuation techniques		DCF Model		DCF Model
Inputs		Interest rates		Interest rates
Financial assets at fair value through other comprehensive income
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		₩ 61,825,197		₩ 46,436,051
Fair value		61,825,197		46,436,051
Financial Assets Measured At Fair Value		₩ 61,825,197		46,436,051
Description Of Valuation Processes Used In Fair Value Measurement Assets		Fair value of financial instruments that are quoted in active markets is determined using the quoted prices. If there is no quoted price, fair value is determined using external professional valuation institution. The institutions use one or more of the following valuation techniques including DCF Model, Free Cash Flow to Equity Model, Comparable Company Analysis, Dividend Discount Model, Risk Adjusted Discount Rate Method, and Net Asset Value Method, deemed suitable considering the characteristics of the financial instruments.
Financial assets at fair value through other comprehensive income | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 18,731,801		15,188,993
Financial assets at fair value through other comprehensive income | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		40,645,505		29,764,660
Financial assets at fair value through other comprehensive income | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		2,447,891	[1]	1,482,398
Debt securities
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		58,456,889		43,556,848
Fair value		58,456,889		43,556,848
Financial Assets Measured At Fair Value		58,456,889		43,556,848
Debt securities | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		18,147,167		14,236,566
Debt securities | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 40,309,722		₩ 29,320,282
Valuation techniques		DCF Model, Market value approach		DCF Model, Option model, Market value approach
Inputs		Discount rate, Volatility and others		Discount rate, Underlying asset Index, Volatility, and others
Debt securities | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 0	[1]	₩ 0
Equity securities
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		3,074,899		2,504,105
Fair value		3,074,899		2,504,105
Financial Assets Measured At Fair Value		3,074,899		2,504,105
Equity securities | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		584,634		952,427
Equity securities | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 70,357		₩ 69,280
Valuation techniques		DCF Model		DCF Model, Black-Scholes Model
Inputs		Interest rate, Discount rate and others		Discount rate, Underlying asset Index, Volatility, and others
Equity securities | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 2,419,908	[1]	₩ 1,482,398
Loans
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		293,409		375,098
Fair value		293,409		375,098
Financial Assets Measured At Fair Value		293,409		375,098
Loans | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		0		0
Loans | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 265,426		₩ 375,098
Valuation techniques		DCF Model		DCF Model
Inputs		Discount rate, Volatility and others		Discount rate, Underlying asset Index, Volatility, and others
Loans | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Measured At Fair Value		₩ 27,983	[1]	₩ 0
Others
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Carrying amount		14,167,689		9,147,059
Fair value		14,167,689		9,147,059
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed	[4]	₩ 14,167,689		9,147,059
Description Of Valuation Processes Used In Fair Value Measurement Assets		Carrying amounts are reasonable approximation of fair values. These financial instruments are temporary accounts used for other various transactions and their maturities are relatively short or not defined.
Others | Level 1
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed	[4]	₩ 0		0
Others | Level 2
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed	[4]	0		0
Others | Level 3
Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items]
Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed	[4]	₩ 14,167,689		₩ 9,147,059
[1]	Included KB Securities Co., Ltd.'s OTC derivatives consist of KRW 635,920 million of financial assets at fair value through profit or loss (debt instruments), KRW 9,201,431 million of financial liabilities designated at fair value through profit or loss, KRW 441,775 million of derivative financial assets and KRW 134,934 million of derivative financial liabilities.
[2]	The amounts included in Level 2 are the carrying amounts which are reasonable approximations of the fair value.
[3]	Borrowings of KRW 4,685 million and KRW 292 million included in Level 2 is the carrying amounts which are reasonable approximation of fair value as of December 31, 2019 and 2020, respectively.
[4]	Other financial assets and other financial liabilities included in Level 3 are the carrying amounts which are reasonable approximation of fair value.

Financial Assets and Financia_4

Financial Assets and Financial Liabilities_Fair Value Hierarchy Group Classifies And Discloses FairValue Of Financial Instruments(Details)	12 Months Ended
	Dec. 31, 2020
Level 1
Disclosure Of Fair Value Hierarchy Group Classifies And Discloses Fair Value Of Financial Instruments Line Items [Line Items]
Description Of Fair Value Hierarchy Classified And Disclosed By Group	Level 1: The fair values are based on quoted prices (unadjusted) in active markets for identical assets or liabilities that the entity can access at the measurement date.
Level 2
Disclosure Of Fair Value Hierarchy Group Classifies And Discloses Fair Value Of Financial Instruments Line Items [Line Items]
Description Of Fair Value Hierarchy Classified And Disclosed By Group	Level 2: The fair values are based on inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly.
Level 3
Disclosure Of Fair Value Hierarchy Group Classifies And Discloses Fair Value Of Financial Instruments Line Items [Line Items]
Description Of Fair Value Hierarchy Classified And Disclosed By Group	Level 3: The fair values are based on unobservable inputs for the asset or liability.

Financial Assets and Financia_5

Financial Assets and Financial Liabilities_Details Of Changes In Level3 Of The Fair Value Hierarchy(Details) - Level3 Of Fair Value Hierarchy Member [Member] - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Due from financial institutions measured at fair value through profit or loss
Reconciliation Of Changes In Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Beginning balance		₩ 51,125	₩ 48,743
Total Gains Losses From Financial Assets Liabilities Measured At Fair Value Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Profit or loss		(2,021)	1,207
Other comprehensive income (loss)		(7,693)	1,175
Purchases		135,227	0
Sales		(86,555)	0
Issues		0	0
Settlements		0	0
Transfers into Level 3	[1]	0	0
Transfers out of Level 3	[1]	0	0
Ending balance		90,083	51,125
Securities measured at fair value through profit or loss
Reconciliation Of Changes In Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Beginning balance		10,656,042	7,464,860
Total Gains Losses From Financial Assets Liabilities Measured At Fair Value Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Profit or loss		22,069	(66,208)
Other comprehensive income (loss)		144,963	111,826
Purchases		3,519,573	4,544,254
Sales		(3,263,111)	(2,139,174)
Issues		0	0
Settlements		0	0
Transfers into Level 3	[1]	129,580	851,457
Transfers out of Level 3	[1]	(109,193)	(110,973)
Ending balance		₩ 11,099,923	₩ 10,656,042
Description Of Reasons For Transfers Into Level3 Of Fair Value Hierarchy Assets		Changes in levels for the financial instruments occurred due to the change in the availability of observable market data.	The changes in levels for the financial instruments occurred due to the change in the availability of observable market data
Description Of Reasons For Transfers Out Of Level3 Of Fair Value Hierarchy Assets		Changes in levels for the financial instruments occurred due to the change in the availability of observable market data.	The changes in levels for the financial instruments occurred due to the change in the availability of observable market data
Loans measured at fair value through profit or loss
Reconciliation Of Changes In Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Beginning balance		₩ 188,133	₩ 213,203
Total Gains Losses From Financial Assets Liabilities Measured At Fair Value Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Profit or loss		627	10,412
Other comprehensive income (loss)		0	0
Purchases		0	154,005
Sales		(150,004)	(189,487)
Issues		0	0
Settlements		0	0
Transfers into Level 3	[1]	0	0
Transfers out of Level 3	[1]	0	0
Ending balance		38,756	188,133
Financial assets at fair value through other comprehensive income
Reconciliation Of Changes In Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Beginning balance			1,332,718
Total Gains Losses From Financial Assets Liabilities Measured At Fair Value Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Profit or loss			0
Other comprehensive income (loss)			55,993
Purchases			95,359
Sales			(1,672)
Issues			0
Settlements			0
Transfers into Level 3	[1]		0
Transfers out of Level 3	[1]		0
Equity securities measured at fair value through other comprehensive income
Reconciliation Of Changes In Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Beginning balance		1,482,398
Total Gains Losses From Financial Assets Liabilities Measured At Fair Value Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Profit or loss		(206)
Other comprehensive income (loss)		815,244
Purchases		122,827
Sales		(355)
Issues		0
Settlements		0
Transfers into Level 3	[1]	0
Transfers out of Level 3	[1]	0
Ending balance		2,419,908	1,482,398
Loans measured at fair value through other comprehensive income
Reconciliation Of Changes In Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Beginning balance		0
Total Gains Losses From Financial Assets Liabilities Measured At Fair Value Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Profit or loss		0
Other comprehensive income (loss)		(217)
Purchases		40,000
Sales		(11,800)
Issues		0
Settlements		0
Transfers into Level 3	[1]	0
Transfers out of Level 3	[1]	0
Ending balance		27,983	0
Financial liabilities designated at fair value through profit or loss
Reconciliation Of Changes In Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Beginning balance		(11,222,032)	(10,873,383)
Total Gains Losses From Financial Assets Liabilities Measured At Fair Value Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Profit or loss		(406,788)	(1,285,157)
Other comprehensive income (loss)		(27,876)	(25,538)
Purchases		0	0
Sales		0	0
Issues		(9,333,419)	(12,416,402)
Settlements		11,788,684	13,378,448
Transfers into Level 3	[1]	0	0
Transfers out of Level 3	[1]	0	0
Ending balance		(9,201,431)	(11,222,032)
Derivatives held for trading
Reconciliation Of Changes In Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Beginning balance		309,966	(300,131)
Total Gains Losses From Financial Assets Liabilities Measured At Fair Value Level3 Of The Fair Value Hierarchy Abstract [Abstract]
Profit or loss		400,241	851,453
Other comprehensive income (loss)		0	0
Purchases		(24,165)	0
Sales		(328,348)	(163,856)
Issues		(42,732)	(59,202)
Settlements		90	(1,316)
Transfers into Level 3	[1]	(1,044)	(16,982)
Transfers out of Level 3	[1]	(13,587)	0
Ending balance		₩ 300,421	₩ 309,966
Description Of Reasons For Transfers Into Level3 Of Fair Value Hierarchy Assets		Changes in levels for the financial instruments occurred due to the change in the availability of observable market data.	The changes in levels for the financial instruments occurred due to the change in the availability of observable market data
[1]	Changes in levels for the financial instruments occurred due to the change in the availability of observable market data.

Financial Assets and Financia_6

Financial Assets and Financial Liabilities_Total Gains Or Losses Recognized In Profit Or Loss For The Period(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net gains(losses) on financial instruments at fair value through profit or loss
Total Gain Or Losses From Changes In Level3 Fair Value Hierarchy Line Items [Line Items]
Total gains (losses) recognized in profit or loss for the year	₩ 70,251	₩ (489,703)	₩ (36,466)
Total gains (losses) recognized in profit or loss from financial instruments held at the end of the reporting year	129,824	(37,668)	144,674
Other operating income(expenses)
Total Gain Or Losses From Changes In Level3 Fair Value Hierarchy Line Items [Line Items]
Total gains (losses) recognized in profit or loss for the year	(56,329)	1,388	(405)
Total gains (losses) recognized in profit or loss from financial instruments held at the end of the reporting year	(60,884)	1,331	(289)
Net interest income
Total Gain Or Losses From Changes In Level3 Fair Value Hierarchy Line Items [Line Items]
Total gains (losses) recognized in profit or loss for the year	0	22	617
Total gains (losses) recognized in profit or loss from financial instruments held at the end of the reporting year	₩ 0	₩ 0	₩ 43

Financial Assets and Financia_7

Financial Assets and Financial Liabilities_Information About Fair Value Measurements Using Unobservable Inputs Assets(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 14,118,521	₩ 12,914,482
Due from financial institutions
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 90,083	₩ 51,125
Valuation techniques	MonteCarlo Simulation	Option Model
Relationship Of Volatility Of The Underlying Asset	The higher the volatility of the underlying asset, the higher the fair value fluctuation	The higher the volatility of the underlying asset, the higher the fair value fluctuation
Relationship Of Correlation Coefficient	The higher the correlation coefficient, the higher the fair value fluctuation	The higher the correlation coefficient, the higher the fair value fluctuation
Due from financial institutions | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Volatility Of The Underlying Asset Unobservable Inputs Assets	19.40%	11.43%
Correlation Coefficient Unobservable Inputs Assets	12.27%	(4.84%)
Due from financial institutions | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Volatility Of The Underlying Asset Unobservable Inputs Assets	36.76%	34.39%
Correlation Coefficient Unobservable Inputs Assets	12.27%	(4.84%)
Debt securities
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 10,518,113	₩ 10,132,766
Valuation techniques	DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull-White Model, Black-Scholes Model, Option Model, Binomial Model, Net Asset Value Method, Income approach, Market approach and others	DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull-White Model, Black-Scholes Model, Option Model, Binomial Model, Net Asset Value, Income approach, Market approach and others
Relationship Of Volatility Of The Underlying Asset	The higher the volatility, the higher the fair value fluctuation
Relationship Of Correlation Coefficient Between Underlying Asset	The higher the correlation coefficient, the higher the fair value fluctuation	The higher the correlation coefficient, the higher the fair value fluctuation
Relationship Of Discount Rate	The lower the discount rate, the higher the fair value	The lower the discount rate, the higher the fair value
Relationship Of Growth Rate	The higher the growth rate, the higher the fair value	The higher the growth rate, the higher the fair value
Relationship Of Liquidation Value	The higher the liquidation value, the higher the fair value	The higher the liquidation value, the higher the fair value
Relationship Of Recovery Rate	The higher the recovery rate, the higher the fair value	The higher the recovery rate, the higher the fair value
Relationship Of Volatility		The higher the volatility, the higher the fair value fluctuation
Relationship Of Volatility of real estate price	The higher the price of real estate, the higher the fair value	The higher the price of real estate, the higher the fair value
Debt securities | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Correlation Coefficient Between Underlying Asset Unobservable Inputs Assets	(61.12%)	3.11%
Discount Rate Unobservable Inputs Assets	0.00%	0.75%
Growth Rate Unobservable Inputs Assets	0.00%	(1.00%)
Liquidation Value Unobservable Inputs Assets	0.00%	0.00%
Recovery Rate Unobservable Inputs Assets	40.00%	40.00%
Volatility Unobservable Inputs Assets	8.00%	1.00%
Volatility of real estate price Unobservable Inputs Assets	0.00%	(1.00%)
Debt securities | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Correlation Coefficient Between Underlying Asset Unobservable Inputs Assets	100.00%	95.67%
Discount Rate Unobservable Inputs Assets	21.37%	17.37%
Growth Rate Unobservable Inputs Assets	2.00%	1.00%
Liquidation Value Unobservable Inputs Assets	0.00%	0.00%
Recovery Rate Unobservable Inputs Assets	40.00%	40.00%
Volatility Unobservable Inputs Assets	179.75%	48.00%
Volatility of real estate price Unobservable Inputs Assets	0.00%	1.00%
Equity securities
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 581,810	₩ 523,276
Valuation techniques	Income approach, Market approach, Asset value approach, DCF Model, Comparable Company Analysis, Risk adjusted discount rate method, Dividend Discount Model, Usage of past transactions, Binomial Model and others	Income approach, Market value approach, Asset value approach, DCF Model, Comparable Company Analysis, Risk adjusted discount rate method, Dividend Discount Model, Usage of past transactions, Binomial Model and others
Relationship Of Discount Rate	The lower the discount rate, the higher the fair value	The lower the discount rate, the higher the fair value
Relationship Of Growth Rate	The higher the growth rate, the higher the fair value	The higher the growth rate, the higher the fair value
Relationship Of Liquidation Value	The higher the liquidation value, the higher the fair value	The higher the liquidation value, the higher the fair value
Relationship Of Volatility		The higher the volatility, the higher the fair value fluctuation
Equity securities | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Discount Rate Unobservable Inputs Assets	0.60%	2.00%
Growth Rate Unobservable Inputs Assets	0.00%	0.00%
Liquidation Value Unobservable Inputs Assets	0.00%	(1.00%)
Volatility Unobservable Inputs Assets		11.90%
Equity securities | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Discount Rate Unobservable Inputs Assets	18.67%	22.00%
Growth Rate Unobservable Inputs Assets	1.10%	2.20%
Liquidation Value Unobservable Inputs Assets	0.00%	1.00%
Volatility Unobservable Inputs Assets		11.90%
Loans measured at fair value through profit or loss
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 38,756	₩ 188,133
Valuation techniques	Binomial Model, DCF Model	Binomial Model, DCF Model
Relationship Of Volatility Of the Stock Price	The higher the volatility, the higher the fair value fluctuation	The higher the volatility, the higher the fair value fluctuation
Relationship Of Discount Rate	The lower the discount rate, the higher the fair value	The lower the discount rate, the higher the fair value
Loans measured at fair value through profit or loss | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Volatility Of The Stock Price Unobservable Inputs Assets	0.00%	12.91%
Discount Rate Unobservable Inputs Assets	7.86%	10.81%
Loans measured at fair value through profit or loss | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Volatility Of The Stock Price Unobservable Inputs Assets	0.00%	48.28%
Discount Rate Unobservable Inputs Assets	7.86%	10.81%
Stock and index
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 382,337	₩ 416,486
Valuation techniques	DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Model, Black-Scholes Model, Binomial Model	DCF Model, Closed Form, FDM, Monte Carlo Simulation, Hull and White Model, Black-Scholes Model, Binomial Model
Relationship Of Volatility Of The Underlying Asset	The higher the volatility, the higher the fair value fluctuation	The higher the volatility of the underlying asset, the higher the fair value fluctuation
Relationship Of Correlation Coefficient Between Underlying Asset	The higher the correlation coefficient, the higher the fair value fluctuation	The higher the correlation coefficient, the higher the fair value fluctuation
Stock and index | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Volatility Of The Underlying Asset Unobservable Inputs Assets	20.00%	9.75%
Correlation Coefficient Between Underlying Asset Unobservable Inputs Assets	(61.12%)	4.00%
Stock and index | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Volatility Of The Underlying Asset Unobservable Inputs Assets	72.00%	52.00%
Correlation Coefficient Between Underlying Asset Unobservable Inputs Assets	89.01%	77.00%
Currency and interest rate
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value		₩ 120,298
Valuation techniques		DCF Model, Hull-White Model
Relationship Of Correlation Coefficient Between Underlying Asset		The higher the correlation coefficient, the higher the fair value fluctuation
Relationship Of Volatility		The higher the volatility, the higher the fair value fluctuation
Currency and interest rate | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Correlation Coefficient Between Underlying Asset Unobservable Inputs Assets		(49.00%)
Volatility Unobservable Inputs Assets		2.00%
Currency and interest rate | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Correlation Coefficient Between Underlying Asset Unobservable Inputs Assets		90.00%
Volatility Unobservable Inputs Assets		58.00%
Others
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 59,531
Valuation techniques	DCF Model, Hull-White Model
Relationship Of Correlation Coefficient Between Underlying Asset	The higher the correlation coefficient, the higher the fair value fluctuation
Relationship Of Volatility	The higher the volatility, the higher the fair value fluctuation
Others | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Correlation Coefficient Between Underlying Asset Unobservable Inputs Assets	(50.48%)
Volatility Unobservable Inputs Assets	0.00%
Others | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Correlation Coefficient Between Underlying Asset Unobservable Inputs Assets	90.95%
Volatility Unobservable Inputs Assets	68.00%
Equity securities
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 2,419,908	₩ 1,482,398
Valuation techniques	Risk adjusted discount rate method, IMV Model, DCF Model, Comparable Company Analysis, Dividend discount model, Option Model, Net Asset Value Method, Market approach, One Factor Hull-White Model and others	Risk adjusted discount rate method, IMV Model, DCF Model, Comparable Company Analysis, Dividend discount model, Option Model, Net Asset value method, Market approach, One Factor Hull-White Model and others
Relationship Of Discount Rate	The lower the discount rate, the higher the fair value	The lower the discount rate, the higher the fair value
Relationship Of Growth Rate	The higher the growth rate, the higher the fair value	The higher the growth rate, the higher the fair value
Relationship Of Volatility	The higher the volatility, the higher the fair value fluctuation	The higher the volatility, the higher the fair value fluctuation
Equity securities | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Discount Rate Unobservable Inputs Assets	7.60%	3.04%
Growth Rate Unobservable Inputs Assets	0.00%	0.00%
Volatility Unobservable Inputs Assets	22.11%	20.97%
Equity securities | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Discount Rate Unobservable Inputs Assets	19.67%	16.37%
Growth Rate Unobservable Inputs Assets	2.00%	2.20%
Volatility Unobservable Inputs Assets	24.16%	34.87%
Loans
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 27,983
Valuation techniques	DCF Model
Relationship Of Discount Rate	The lower the discount rate, the higher the fair value
Loans | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Discount Rate Unobservable Inputs Assets	2.10%
Loans | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Discount Rate Unobservable Inputs Assets	4.21%

Financial Assets and Financia_8

Financial Assets and Financial Liabilities_Information About Fair Value Measurements Using Unobservable Inputs Liablities(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Line Items [Line Items]
Fair value	₩ 9,342,878	₩ 11,448,850
Derivative linked securities
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Line Items [Line Items]
Fair value	₩ 9,201,431	₩ 11,222,032
Valuation techniques	DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Model, Black-Scholes Model	DCF Model, Closed Form, FDM, Monte Carlo Simulation, Hull and White Model, Black Scholes-Model
Relationship Of Volatility Of The Underlying Asset	The higher the volatility, the higher the fair value fluctuation	The higher the volatility, the higher the fair value fluctuation
Relationship Of Correlation Between Underlying Asset	The higher the absolute value of correlation coefficient, the higher the fair value fluctuation	The higher the absolute value of correlation coefficient, the higher the fair value fluctuation
Derivative linked securities | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Line Items [Line Items]
Volatility Of The Underlying Asset Unobservable Inputs Liabilities	1.00%	1.00%
Correlation Coefficient Between Underlying Asset Unobservable Inputs Liabilities	(61.12%)	(49.00%)
Derivative linked securities | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Line Items [Line Items]
Volatility Of The Underlying Asset Unobservable Inputs Liabilities	72.00%	58.00%
Correlation Coefficient Between Underlying Asset Unobservable Inputs Liabilities	90.95%	90.00%
Stock and index
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Line Items [Line Items]
Fair value	₩ 60,291	₩ 54,341
Valuation techniques	DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Model, Black-Scholes Model, Binomial Model	DCF Model, Closed Form, FDM, MonteCarlo Simulation, Hull and White Model, Black-Scholes Model, Binomial Model
Relationship Of Correlation Between Underlying Asset	The higher the correlation coefficient, the higher the fair value fluctuation	The higher the correlation coefficient, the higher the fair value fluctuation
Relationship Of Volatility	The higher the volatility, the higher the fair value fluctuation	The higher the volatility, the higher the fair value fluctuation
Stock and index | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Line Items [Line Items]
Correlation Coefficient Between Underlying Asset Unobservable Inputs Liabilities	(61.12%)	9.00%
Volatility Unobservable Inputs Liabilities	20.00%	12.00%
Stock and index | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Line Items [Line Items]
Correlation Coefficient Between Underlying Asset Unobservable Inputs Liabilities	90.95%	77.00%
Volatility Unobservable Inputs Liabilities	68.00%	52.00%
Others
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Line Items [Line Items]
Fair value	₩ 81,156	₩ 172,477
Valuation techniques	MonteCarlo Simulation, Hull and White Model, DCF Model, Closed Form	MonteCarlo Simulation, Hull and White Model, DCF Model, Closed Form
Relationship Of Correlation Between Underlying Asset	The higher the absolute value of correlation coefficient, the higher the fair value fluctuation	The higher the absolute value of correlation coefficient, the higher the fair value fluctuation
Relationship Of Volatility Of The Interest Rate		The higher the volatility, the higher the fair value fluctuation
Relationship Of Volatility Of the Stock Price		The higher the volatility, the higher the fair value fluctuation
Relationship Of Discount Rate	The higher the discount rate, the lower the fair value	The higher the discount rate, the lower the fair value
Relationship Of Volatility	The higher the volatility, the higher the fair value fluctuation	The higher the volatility, the higher the fair value fluctuation
Others | Bottom Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Line Items [Line Items]
Correlation Coefficient Between Underlying Asset Unobservable Inputs Liabilities	(50.48%)	19.00%
Volatility Of The Stock Price Unobservable Inputs Liabilities		16.28%
Volatility Of The Interest Rate Unobservable Inputs Liabilities		0.52%
Discount Rate Unobservable Inputs Liabilities	1.50%	1.94%
Volatility Unobservable Inputs Liabilities	21.00%	2.00%
Others | Top Of Range Member [Member]
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Line Items [Line Items]
Correlation Coefficient Between Underlying Asset Unobservable Inputs Liabilities	90.95%	90.00%
Volatility Of The Stock Price Unobservable Inputs Liabilities		16.28%
Volatility Of The Interest Rate Unobservable Inputs Liabilities		0.52%
Discount Rate Unobservable Inputs Liabilities	1.29%	2.00%
Volatility Unobservable Inputs Liabilities	68.00%	58.00%

Financial Assets and Financia_9

Financial Assets and Financial Liabilities_Sensitivity Analysis Of Changes In Unobservable Inputs Assets(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Recognition in profit or loss
Favorable changes		₩ 78,016		₩ 87,422
Unfavorable changes		(49,068)		(70,977)
Other comprehensive income
Favorable changes		124,481		217,721
Unfavorable changes		(77,040)		(113,789)
Due from financial institutions measured at fair value through profit or loss
Recognition in profit or loss
Favorable changes	[1]	2		3
Unfavorable changes	[1]	(2)		(3)
Other comprehensive income
Favorable changes	[1]	199		2
Unfavorable changes	[1]	₩ (222)		₩ (2)
Description Of Interrelationships Between Unobservable Inputs And Of How They Might Magnify Or Mitigate Effect Of Changes In Unobservable Inputs On Fair Value Measurement Assets		For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by increase of decrease 10%.		For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by increase of decrease 10%.
Debt securities
Recognition in profit or loss
Favorable changes	[1],[2]	₩ 35,790		₩ 30,771
Unfavorable changes	[1],[2]	(12,826)		(27,062)
Other comprehensive income
Favorable changes	[1],[2]	2,123		2,341
Unfavorable changes	[1],[2]	₩ (2,122)		₩ (2,276)
Description Of Interrelationships Between Unobservable Inputs And Of How They Might Magnify Or Mitigate Effect Of Changes In Unobservable Inputs On Fair Value Measurement Assets		For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by increase of decrease 10%. For beneficiary certificates, it is practically impossible to analyze sensitivity of changes in unobservable inputs. But only for beneficiary certificates whose underlying assets are real estates, changes in fair value are calculated by shifting correlation between discount rate of rent cashflow (-1~1%) and volatility of real estate price (-1~1%).		For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by increase of decrease 10%. For beneficiary certificates, it is practically impossible to analyze sensitivity of changes in unobservable inputs. But only for beneficiary certificates whose underlying assets are real estates, changes in fair value are calculated by shifting correlation between discount rate of rent cashflow (-1~1%) and volatility of real estate price (-1~1%).
Equity securities
Recognition in profit or loss
Favorable changes	[1],[3]	₩ 16,125		₩ 24,456
Unfavorable changes	[1],[3]	(8,275)		(10,251)
Other comprehensive income
Favorable changes	[1],[3]	973		1,110
Unfavorable changes	[1],[3]	₩ (744)		₩ (824)
Description Of Interrelationships Between Unobservable Inputs And Of How They Might Magnify Or Mitigate Effect Of Changes In Unobservable Inputs On Fair Value Measurement Assets		For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by increase of decrease 10%.		For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by increase of decrease 10%.
Loans measured at fair value through profit or loss
Recognition in profit or loss
Favorable changes	[4]	₩ 3,316	[1]	₩ 6,362
Unfavorable changes	[1],[4]	(2,952)		(4,344)
Other comprehensive income
Favorable changes	[1],[4]	0		0
Unfavorable changes	[1],[4]	₩ 0		₩ 0
Description Of Interrelationships Between Unobservable Inputs And Of How They Might Magnify Or Mitigate Effect Of Changes In Unobservable Inputs On Fair Value Measurement Assets		For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by increase of decrease 10%. For loans, changes in fair value are calculated by shifting principal unobservable input parameters such as stock price, volatility of stock price (-10~10%), discount rate (-1~1%).		For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by increase of decrease 10%. For loans, changes in fair value are calculated by shifting principal unobservable input parameters such as stock price, volatility of stock price (-10~10%), discount rate (-1~1%).
Derivatives held for trading
Recognition in profit or loss
Favorable changes	[5]	₩ 22,783		₩ 25,830
Unfavorable changes	[5]	(25,013)		(29,317)
Other comprehensive income
Favorable changes	[5]	0		0
Unfavorable changes	[5]	₩ 0		₩ 0
Description Of Interrelationships Between Unobservable Inputs And Of How They Might Magnify Or Mitigate Effect Of Changes In Unobservable Inputs On Fair Value Measurement Assets		For derivatives financial instruments, changes in fair value are calculated by shifting principal unobservable input parameters; such as, price of underlying asset, volatility of stock price, volatility of interest rate by increase of decrease 10% and the loss given default ratio, discount rate by increase of decrease 1%.		For derivatives financial instruments, changes in fair value are calculated by shifting principal unobservable input parameters; such as, price of underlying asset, volatility of stock price, volatility of interest rate by increase of decrease 10% and the loss given default ratio, discount rate by increase of decrease 1%.
Equity securities
Recognition in profit or loss
Favorable changes	[3]	₩ 0		₩ 0
Unfavorable changes	[3]	0		0
Other comprehensive income
Favorable changes	[3]	120,652		214,268	[6]
Unfavorable changes	[3]	₩ (73,434)		₩ (110,687)	[6]
Description Of Interrelationships Between Unobservable Inputs And Of How They Might Magnify Or Mitigate Effect Of Changes In Unobservable Inputs On Fair Value Measurement Assets		For equity securities, changes in fair value are calculated by shifting principal unobservable input parameters; such as, correlation between growth rate (0~1%) and discount rate (-1~1%) or between liquidation value (-1~1%) and discount rate (-1~1%).		For equity securities, changes in fair value are calculated by shifting principal unobservable input parameters; such as, correlation between growth rate (0~1%) and discount rate (-1~1%) or between liquidation value (-1~1%) and discount rate (-1~1%).
Loans
Other comprehensive income
Favorable changes	[6]	₩ 534
Unfavorable changes	[6]	₩ (518)
Description Of Interrelationships Between Unobservable Inputs And Of How They Might Magnify Or Mitigate Effect Of Changes In Unobservable Inputs On Fair Value Measurement Assets		For loans measured at fair value through other comprehensive income, changes in fair value are calculated by shifting principal unobservable input parameters such as discount rate, volatility of the underlying asset 1%, growth rate 10%.
[1]	For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by increase of decrease 10%.
[2]	For beneficiary certificates, it is practically impossible to analyze sensitivity of changes in unobservable inputs. But only for beneficiary certificates whose underlying assets are real estates, changes in fair value are calculated by shifting correlation between discount rate of rent cashflow (-1~1%) and volatility of real estate price (-1~1%).
[3]	For equity securities, changes in fair value are calculated by shifting principal unobservable input parameters; such as, correlation between growth rate (0~1%) and discount rate (-1~1%) or between liquidation value (-1~1%) and discount rate (-1~1%).
[4]	For loans, changes in fair value are calculated by shifting principal unobservable input parameters such as stock price, volatility of stock price (-10~10%), discount rate (-1~1%).
[5]	For derivatives financial instruments, changes in fair value are calculated by shifting principal unobservable input parameters; such as, price of underlying asset, volatility of stock price, volatility of interest rate by increase of decrease 10% and the loss given default ratio, discount rate by increase of decrease 1%.
[6]	For loans measured at fair value through other comprehensive income, changes in fair value are calculated by shifting principal unobservable input parameters such as discount rate, volatility of the underlying asset 1%, growth rate 10%.

Financial Assets and Financi_10

Financial Assets and Financial Liabilities_Sensitivity Analysis Of Changes In Unobservable Inputs Liablities(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Recognition in profit or loss
Faverable changes		₩ 54,114	₩ 64,368
Unfaverable changes		(50,134)	(57,708)
Other comprehensive income
Faverable changes		0	0
Unfaverable changes		0	0
Financial instruments designated at fair value through profit or loss
Recognition in profit or loss
Faverable changes		46,859	49,730
Unfaverable changes		(42,995)	(44,136)
Other comprehensive income
Faverable changes		0	0
Unfaverable changes		₩ 0	₩ 0
Description Of Interrelationships Between Unobservable Inputs And Of How They Might Magnify Or Mitigate Effect Of Changes In Unobservable Inputs On Fair Value Measurement Liabilities		For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by increase of decrease 10%.	For financial instruments at fair value through profit or loss, changes in fair value are calculated by shifting principal unobservable input parameters such as volatility of the underlying asset or correlation coefficient between underlying asset by increase of decrease 10%.
Derivatives held for trading
Recognition in profit or loss
Faverable changes	[1]	₩ 7,255	₩ 14,638
Unfaverable changes	[1]	(7,139)	(13,572)
Other comprehensive income
Faverable changes	[1]	0	0
Unfaverable changes	[1]	₩ 0	₩ 0
Description Of Interrelationships Between Unobservable Inputs And Of How They Might Magnify Or Mitigate Effect Of Changes In Unobservable Inputs On Fair Value Measurement Liabilities		For derivatives financial instruments, changes in fair value are calculated by shifting principal unobservable input parameters; such as, price of underlying asset, volatility of stock price, volatility of interest rate by increase of decrease 10% and the loss given default ratio, discount rate by increase of decrease 1%.	For derivatives financial instruments, changes in fair value are calculated by shifting principal unobservable input parameters; such as, price of underlying asset, volatility of stock price, volatility of interest rate by increase of decrease 10% and the loss given default ratio, discount rate by increase of decrease 1%.
[1]	For derivatives financial instruments, changes in fair value are calculated by shifting principal unobservable input parameters; such as, price of underlying asset, volatility of stock price, volatility of interest rate by increase of decrease 10% and the loss given default ratio, discount rate by increase of decrease 1%.

Financial Assets and Financi_11

Financial Assets and Financial Liabilities_Day One Gain Or Loss(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation Of Aggregate Difference Between Fair Value At Initial Recognition And Amount Determined Using Valuation Technique Yet To Be Recognised Abstract [Abstract]
Balance at the beginning of the year	₩ 45,767	₩ 62,155
New transactions	166,555	168,225
Changes during the year	(150,929)	(184,613)
Balance at the end of the year	₩ 61,393	₩ 45,767

Financial Assets and Financi_12

Financial Assets and Financial Liabilities_Carrying Amounts Of Financial Instruments By Category Assets(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	₩ 582,219,781	₩ 498,191,361
Cash and due from financial institutions
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	25,608,842	20,837,878
Financial assets at fair value through profit or loss
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	61,035,455	53,549,086
Derivatives
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	5,545,385	3,190,673
Loans measured at amortized cost
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	377,166,984	339,684,059
Financial investments
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	98,695,426	71,782,606
Other financial assets
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	14,167,689	9,147,059
Financial instruments at fair value through profit or loss
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	66,245,967	56,557,684
Financial instruments at fair value through profit or loss | Cash and due from financial institutions
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments at fair value through profit or loss | Financial assets at fair value through profit or loss
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	61,035,455	53,549,086
Financial instruments at fair value through profit or loss | Derivatives
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	5,210,512	3,008,598
Financial instruments at fair value through profit or loss | Loans measured at amortized cost
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments at fair value through profit or loss | Financial investments
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments at fair value through profit or loss | Other financial assets
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments at fair value through other comprehensive income
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	58,750,298	43,931,946
Financial instruments at fair value through other comprehensive income | Cash and due from financial institutions
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments at fair value through other comprehensive income | Financial assets at fair value through profit or loss
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments at fair value through other comprehensive income | Derivatives
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments at fair value through other comprehensive income | Loans measured at amortized cost
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments at fair value through other comprehensive income | Financial investments
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	58,750,298	43,931,946
Financial instruments at fair value through other comprehensive income | Other financial assets
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments designated at fair value through other comprehensive income
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	3,074,899	2,504,105
Financial instruments designated at fair value through other comprehensive income | Cash and due from financial institutions
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments designated at fair value through other comprehensive income | Financial assets at fair value through profit or loss
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments designated at fair value through other comprehensive income | Derivatives
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments designated at fair value through other comprehensive income | Loans measured at amortized cost
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments designated at fair value through other comprehensive income | Financial investments
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	3,074,899	2,504,105
Financial instruments designated at fair value through other comprehensive income | Other financial assets
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments at amortized cost
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	453,813,744	395,015,551
Financial instruments at amortized cost | Cash and due from financial institutions
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	25,608,842	20,837,878
Financial instruments at amortized cost | Financial assets at fair value through profit or loss
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments at amortized cost | Derivatives
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Financial instruments at amortized cost | Loans measured at amortized cost
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	377,166,984	339,684,059
Financial instruments at amortized cost | Financial investments
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	36,870,229	25,346,555
Financial instruments at amortized cost | Other financial assets
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	14,167,689	9,147,059
Derivatives held for hedging
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	334,873	182,075
Derivatives held for hedging | Cash and due from financial institutions
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Derivatives held for hedging | Financial assets at fair value through profit or loss
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Derivatives held for hedging | Derivatives
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	334,873	182,075
Derivatives held for hedging | Loans measured at amortized cost
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Derivatives held for hedging | Financial investments
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	0	0
Derivatives held for hedging | Other financial assets
Carrying Amounts Of Financial Assets Line Items [Line Items]
Financial Assets	₩ 0	₩ 0

Financial Assets and Financi_13

Financial Assets and Financial Liabilities_Carrying Amounts Of Financial Instruments By Category Liabilities(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	₩ 496,813,305	₩ 435,352,295
Financial liabilities at fair value through profit or loss
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	11,810,058	15,368,153
Derivatives
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	5,222,897	3,007,341
Deposits
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	338,580,220	305,592,771
Borrowings
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	49,827,156	37,818,860
Debentures
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	62,760,687	50,935,583
Other financial liabilities
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	28,612,287	22,629,587
Financial instruments at fair value through profit or loss
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	7,040,023	5,506,277
Financial instruments at fair value through profit or loss | Financial liabilities at fair value through profit or loss
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	2,025,951	2,663,327
Financial instruments at fair value through profit or loss | Derivatives
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	5,014,072	2,842,950
Financial instruments at fair value through profit or loss | Deposits
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Financial instruments at fair value through profit or loss | Borrowings
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Financial instruments at fair value through profit or loss | Debentures
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Financial instruments at fair value through profit or loss | Other financial liabilities
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Financial instruments designated at fair value through profit or loss
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	9,784,107	12,704,826
Financial instruments designated at fair value through profit or loss | Financial liabilities at fair value through profit or loss
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	9,784,107	12,704,826
Financial instruments designated at fair value through profit or loss | Derivatives
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Financial instruments designated at fair value through profit or loss | Deposits
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Financial instruments designated at fair value through profit or loss | Borrowings
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Financial instruments designated at fair value through profit or loss | Debentures
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Financial instruments designated at fair value through profit or loss | Other financial liabilities
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Financial instruments at amortized cost
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	479,780,351	416,976,801
Financial instruments at amortized cost | Financial liabilities at fair value through profit or loss
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Financial instruments at amortized cost | Derivatives
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Financial instruments at amortized cost | Deposits
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	338,580,220	305,592,771
Financial instruments at amortized cost | Borrowings
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	49,827,156	37,818,860
Financial instruments at amortized cost | Debentures
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	62,760,687	50,935,583
Financial instruments at amortized cost | Other financial liabilities
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	28,612,288	22,629,587
Derivatives held for hedging
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	208,825	164,391
Derivatives held for hedging | Financial liabilities at fair value through profit or loss
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Derivatives held for hedging | Derivatives
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	208,825	164,391
Derivatives held for hedging | Deposits
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Derivatives held for hedging | Borrowings
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Derivatives held for hedging | Debentures
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	0	0
Derivatives held for hedging | Other financial liabilities
Carrying Amounts Of Financial Liabilities Line Items [Line Items]
Financial Liabilities	₩ 0	₩ 0

Financial Assets and Financi_14

Financial Assets and Financial Liabilities_The Maximum Exposure To Loss From Its Continuing Involvement In The Derecognized Financial Assets(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Continuing Involvement In Derecognised Financial Assets Line Items [Line Items]
Carrying amount of continuing involvement	₩ 13,202	₩ 20,404
Fair value of continuing involvement	13,202	20,404
Financial assets at fair value through profit or loss | Subordinate debt | Discovery 2nd Securitization Specialty Co., Ltd.
Disclosure Of Continuing Involvement In Derecognised Financial Assets Line Items [Line Items]
Carrying amount of continuing involvement	5,190	5,596
Fair value of continuing involvement	5,190	5,596
Financial assets at fair value through profit or loss | Subordinate debt | FK 1411 ABS Ltd.
Disclosure Of Continuing Involvement In Derecognised Financial Assets Line Items [Line Items]
Carrying amount of continuing involvement	1,062	5,428
Fair value of continuing involvement	1,062	5,428
Financial assets at fair value through profit or loss | Subordinate debt | AP 3B ABS Ltd.
Disclosure Of Continuing Involvement In Derecognised Financial Assets Line Items [Line Items]
Carrying amount of continuing involvement	646	3,205
Fair value of continuing involvement	646	3,205
Financial assets at fair value through profit or loss | Subordinate debt | AP 4D ABS Ltd.
Disclosure Of Continuing Involvement In Derecognised Financial Assets Line Items [Line Items]
Carrying amount of continuing involvement	6,304	6,175
Fair value of continuing involvement	₩ 6,304	₩ 6,175

Financial Assets and Financi_15

Financial Assets and Financial Liabilities_Transferred Financial Assets That Are Not Derecognized In Their Entirety(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Loans Securitised For Senior Debentures Member [Member]
Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Line Items [Line Items]
Carrying amount of underlying assets		₩ 2,592,507	₩ 2,501,307
Fair value of underlying assets		2,580,928	2,463,284
Carrying amount of senior debentures		1,507,460	1,460,298
Fair value of senior debentures		₩ 1,595,785	₩ 1,457,459
KB Kookmin Card 3rd Securitization Co., Ltd.
Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Line Items [Line Items]
Description Of Nature Of Relationship Between Transferred Financial Assets That Are Not Derecognised In Their Entirety And Associated Liabilities			The Group has an obligation to early redeem the asset-backed debentures upon occurrence of an event specified in the agreement such as when the outstanding balance of the eligible asset-backed securitization (ABS), a trust-type ABS, is below the solvency margin ratio (minimum rate: 104.5%) of the beneficiary interest in the trust. To avoid such early redemption, the Group entrusts credit card accounts and deposits in addition to the previously entrusted credit card accounts.
Carrying amount of underlying assets	[1]		₩ 601,659
Fair value of underlying assets	[1]		592,358
Carrying amount of senior debentures	[1]		351,207
Fair value of senior debentures	[1]		₩ 342,204
KB Kookmin Card 4th Securitization Co., Ltd.
Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Line Items [Line Items]
Description Of Nature Of Relationship Between Transferred Financial Assets That Are Not Derecognised In Their Entirety And Associated Liabilities		The Group has an obligation to early redeem the asset-backed debentures upon occurrence of an event specified in the agreement such as when the outstanding balance of the eligible asset-backed securitization (ABS), a trust-type ABS, is below the solvency margin ratio (minimum rate: 104.5%) of the beneficiary interest in the trust. To avoid such early redemption, the Group entrusts credit card accounts and deposits in addition to the previously entrusted credit card accounts.	The Group has an obligation to early redeem the asset-backed debentures upon occurrence of an event specified in the agreement such as when the outstanding balance of the eligible asset-backed securitization (ABS), a trust-type ABS, is below the solvency margin ratio (minimum rate: 104.5%) of the beneficiary interest in the trust. To avoid such early redemption, the Group entrusts credit card accounts and deposits in addition to the previously entrusted credit card accounts.
Carrying amount of underlying assets	[1]	₩ 490,465	₩ 560,903
Fair value of underlying assets	[1]	488,251	552,216
Carrying amount of senior debentures	[1]	219,419	347,387
Fair value of senior debentures	[1]	₩ 226,401	₩ 340,820
KB Kookmin Card 5th Securitization Co., Ltd.
Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Line Items [Line Items]
Description Of Nature Of Relationship Between Transferred Financial Assets That Are Not Derecognised In Their Entirety And Associated Liabilities		The Group has an obligation to early redeem the asset-backed debentures upon occurrence of an event specified in the agreement such as when the outstanding balance of the eligible asset-backed securitization (ABS), a trust-type ABS, is below the solvency margin ratio (minimum rate: 104.5%) of the beneficiary interest in the trust. To avoid such early redemption, the Group entrusts credit card accounts and deposits in addition to the previously entrusted credit card accounts.	The Group has an obligation to early redeem the asset-backed debentures upon occurrence of an event specified in the agreement such as when the outstanding balance of the eligible asset-backed securitization (ABS), a trust-type ABS, is below the solvency margin ratio (minimum rate: 104.5%) of the beneficiary interest in the trust. To avoid such early redemption, the Group entrusts credit card accounts and deposits in addition to the previously entrusted credit card accounts.
Carrying amount of underlying assets	[1]	₩ 476,523	₩ 542,861
Fair value of underlying assets	[1]	474,481	534,630
Carrying amount of senior debentures	[1]	299,838	299,795
Fair value of senior debentures	[1]	₩ 304,914	₩ 304,835
KB Kookmin Card 6th Securitization Co., Ltd.
Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Line Items [Line Items]
Description Of Nature Of Relationship Between Transferred Financial Assets That Are Not Derecognised In Their Entirety And Associated Liabilities		The Group has an obligation to early redeem the asset-backed debentures upon occurrence of an event specified in the agreement such as when the outstanding balance of the eligible asset-backed securitization (ABS), a trust-type ABS, is below the solvency margin ratio (minimum rate: 104.5%) of the beneficiary interest in the trust. To avoid such early redemption, the Group entrusts credit card accounts and deposits in addition to the previously entrusted credit card accounts.	The Group has an obligation to early redeem the asset-backed debentures upon occurrence of an event specified in the agreement such as when the outstanding balance of the eligible asset-backed securitization (ABS), a trust-type ABS, is below the solvency margin ratio (minimum rate: 104.5%) of the beneficiary interest in the trust. To avoid such early redemption, the Group entrusts credit card accounts and deposits in addition to the previously entrusted credit card accounts.
Carrying amount of underlying assets	[1]	₩ 701,360	₩ 795,884
Fair value of underlying assets	[1]	698,421	784,080
Carrying amount of senior debentures	[1]	434,492	461,909
Fair value of senior debentures	[1]	₩ 472,861	469,600
KB Kookmin Card 7th Securitization Co., Ltd.
Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Line Items [Line Items]
Description Of Nature Of Relationship Between Transferred Financial Assets That Are Not Derecognised In Their Entirety And Associated Liabilities		The Group has an obligation to early redeem the asset-backed debentures upon occurrence of an event specified in the agreement such as when the outstanding balance of the eligible asset-backed securitization (ABS), a trust-type ABS, is below the solvency margin ratio (minimum rate: 104.5%) of the beneficiary interest in the trust. To avoid such early redemption, the Group entrusts credit card accounts and deposits in addition to the previously entrusted credit card accounts.
Carrying amount of underlying assets	[1]	₩ 924,159
Fair value of underlying assets	[1]	919,775
Carrying amount of senior debentures	[1]	553,711
Fair value of senior debentures	[1]	591,609
Securiteis Under Repurchase Agreement And Loaned Securities Member [Member]
Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Line Items [Line Items]
Carring Amount of transferred assets		15,845,836	11,577,679
Carrying amount of senior debentures		13,398,140	8,884,847
Bonds sold under repurchase agreements
Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Line Items [Line Items]
Carring Amount of transferred assets	[2]	13,994,352	9,292,858
Carrying amount of senior debentures	[2]	13,398,140	8,884,847
Amounts of the bonds sold under repurchase agreements		2,147,975	4,126,274
Government bond
Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Line Items [Line Items]
Carring Amount of transferred assets		1,831,673	2,259,096
Carrying amount of senior debentures		0	0
Stock
Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Line Items [Line Items]
Carring Amount of transferred assets		19,811	25,725
Carrying amount of senior debentures		₩ 0	₩ 0
[1]	The Group has an obligation to early redeem the asset-backed debentures upon occurrence of an event specified in the agreement such as when the outstanding balance of the eligible asset-backed securitization (ABS), a trust-type ABS, is below the solvency margin ratio (minimum rate: 104.5%) of the beneficiary interest in the trust. To avoid such early redemption, the Group entrusts credit card accounts and deposits in addition to the previously entrusted credit card accounts.
[2]	Bonds sold under repurchase agreements using borrowed securities as collateral amounts to KRW 4,126,274 million and KRW 2,147,975 million as of December 31, 2019 and 2020, respectively.

Financial Assets and Financi_16

Financial Assets and Financial Liabilities_Details Of Financial Assets Subject To Offsetting(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Net Financial Assets Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross assets	₩ 54,906,857	₩ 45,172,197
Gross liabilities offset	(41,298,745)	(31,817,137)
Net amounts in the statement of financial position	13,608,112	13,355,060
Non-offsetting amount
Financial Instruments	(10,975,398)	(11,681,814)
Cash Collateral	(263,564)	(288,040)
Net amount	2,369,150	1,385,206
Derivatives held for trading and Derivatives linked securities
Net Financial Assets Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross assets	5,425,708	3,043,757
Gross liabilities offset	0	0
Net amounts in the statement of financial position	5,425,708	3,043,757
Non-offsetting amount
Financial Instruments	(3,940,729)	(2,122,160)
Cash Collateral	(263,564)	(288,040)
Net amount	1,556,289	815,632
Derivatives held for hedging
Net Financial Assets Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross assets	334,874	182,075
Gross liabilities offset	0	0
Net amounts in the statement of financial position	334,874	182,075
Non-offsetting amount
Financial Instruments	0	0
Cash Collateral	0	0
Net amount	0	0
Receivable spot exchange
Net Financial Assets Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross assets	3,435,657	3,051,390
Gross liabilities offset	0	0
Net amounts in the statement of financial position	3,435,657	3,051,390
Non-offsetting amount
Financial Instruments	(3,434,222)	(3,050,116)
Cash Collateral	0	0
Net amount	1,435	1,274
Bonds purchased under repurchase agreements
Net Financial Assets Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross assets	3,600,447	6,507,646
Gross liabilities offset	0	0
Net amounts in the statement of financial position	3,600,447	6,507,646
Non-offsetting amount
Financial Instruments	(3,600,447)	(6,507,046)
Cash Collateral	0	0
Net amount	0	600
Domestic exchange settlement debits
Net Financial Assets Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross assets	37,549,292	31,344,009
Gross liabilities offset	(36,823,836)	(30,794,160)
Net amounts in the statement of financial position	725,456	549,849
Non-offsetting amount
Financial Instruments	0	0
Cash Collateral	0	0
Net amount	725,456	549,849
Other financial instruments
Net Financial Assets Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross assets	4,560,879	1,043,320
Gross liabilities offset	(4,474,909)	(1,022,977)
Net amounts in the statement of financial position	85,970	20,343
Non-offsetting amount
Financial Instruments	0	(2,492)
Cash Collateral	0	0
Net amount	₩ 85,970	₩ 17,851

Financial Assets and Financi_17

Financial Assets and Financial Liabilities_Details Of Financial Liabilities Subject To Offsetting(Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Net Financial Liabilities Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross liabilities		₩ 69,730,430	₩ 55,769,992
Gross assets offset		(41,310,544)	(31,817,137)
Net amounts in the statement of financial position		28,419,886	23,952,855
Non-offsetting amount
Financial Instruments		(25,985,729)	(22,876,090)
Cash Collateral		(77,324)	(92,565)
Net amount		2,356,833	984,200
Derivatives held for trading and Derivatives linked securities
Net Financial Liabilities Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross liabilities		5,300,028	2,936,638
Gross assets offset		0	0
Net amounts in the statement of financial position		5,300,028	2,936,638
Non-offsetting amount
Financial Instruments		(3,365,443)	(2,182,243)
Cash Collateral		(77,324)	(92,565)
Net amount		2,066,086	826,221
Derivatives held for hedging
Net Financial Liabilities Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross liabilities		208,825	164,391
Gross assets offset		0	0
Net amounts in the statement of financial position		208,825	164,391
Non-offsetting amount
Financial Instruments		0	0
Cash Collateral		0	0
Net amount		0	0
Payable spot exchange
Net Financial Liabilities Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross liabilities		3,434,887	3,050,982
Gross assets offset		0	0
Net amounts in the statement of financial position		3,434,887	3,050,982
Non-offsetting amount
Financial Instruments		(3,434,222)	(3,034,679)
Cash Collateral		0	0
Net amount		665	16,303
Bonds sold under repurchase agreements
Net Financial Liabilities Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross liabilities	[1]	16,329,799	13,011,121
Gross assets offset	[1]	(11,800)	0
Net amounts in the statement of financial position	[1]	16,317,999	13,011,121
Non-offsetting amount
Financial Instruments	[1]	(16,317,999)	(13,000,321)
Cash Collateral	[1]	0	0
Net amount	[1]	0	10,800
Securities borrowing agreements
Net Financial Liabilities Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross liabilities		1,934,736	2,583,092
Gross assets offset		0	0
Net amounts in the statement of financial position		1,934,736	2,583,092
Non-offsetting amount
Financial Instruments		(1,934,736)	(2,583,092)
Cash Collateral		0	0
Net amount		0	0
Domestic exchange settlement credits
Net Financial Liabilities Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross liabilities		37,757,164	32,867,423
Gross assets offset		(36,823,835)	(30,794,160)
Net amounts in the statement of financial position		933,329	2,073,263
Non-offsetting amount
Financial Instruments		(933,329)	(2,073,263)
Cash Collateral		0	0
Net amount		0	0
Other financial instruments
Net Financial Liabilities Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract]
Gross liabilities		4,764,991	1,156,345
Gross assets offset		(4,474,909)	(1,022,977)
Net amounts in the statement of financial position		290,082	133,368
Non-offsetting amount
Financial Instruments		0	(2,492)
Cash Collateral		0	0
Net amount		₩ 290,082	₩ 130,876
[1]	Includes bonds sold under repurchase agreements to customers.

Due From Financial Institutio_3

Due From Financial Institutions At Amortized Cost_Details Of Due From Financial Institutions(Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions at amortized cost	[1]	₩ 22,723,354	₩ 18,147,672
Due from financial institutions in Korean won
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions at amortized cost	[1]	15,688,428	13,414,535
The Bank of Korea
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions at amortized cost	[1]	₩ 11,242,803	₩ 8,117,840
The Bank of Korea | Bottom Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		0.00%	0.00%
The Bank of Korea | Top Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		0.00%	0.00%
Hana Bank and others
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions at amortized cost	[1]	₩ 3,692,044	₩ 4,641,714
Hana Bank and others | Bottom Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		0.00%	0.00%
Hana Bank and others | Top Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		1.90%	1.90%
NH Investment Securities and others
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions at amortized cost	[1]	₩ 753,581	₩ 654,981
NH Investment Securities and others | Bottom Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		0.00%	0.00%
NH Investment Securities and others | Top Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		1.63%	1.63%
Due from financial institutions in foreign currencies
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions at amortized cost	[1]	₩ 7,034,926	₩ 4,733,137
Wells Fargo Bank, N.A. and others
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions at amortized cost	[1]	₩ 4,215,918	₩ 2,351,929
Wells Fargo Bank, N.A. and others | Bottom Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		0.00%	0.00%
Wells Fargo Bank, N.A. and others | Top Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		3.50%	3.50%
Bank of Shanghai, Beijing Branch and others
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions at amortized cost	[1]	₩ 739,637	₩ 1,053,776
Bank of Shanghai, Beijing Branch and others | Bottom Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		0.00%	0.00%
Bank of Shanghai, Beijing Branch and others | Top Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		7.05%	7.05%
Societe Generale (Paris) and others
Cash And Cash Equivalents Line Items [Line Items]
Due from financial institutions at amortized cost	[1]	₩ 2,079,371	₩ 1,327,432
Societe Generale (Paris) and others | Bottom Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		0.00%	0.00%
Societe Generale (Paris) and others | Top Of Range Member [Member]
Cash And Cash Equivalents Line Items [Line Items]
Interest rate(%)		7.70%	7.70%
[1]	Before netting of allowance

Due From Financial Institutio_4

Due From Financial Institutions At Amortized Cost_Restricted Cash From Financial Institutions(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Restricted Cash And Cash Equivalents Items Line Items [Line Items]
Restricted due from financial institutions at amortized cost	[1]	₩ 15,303,363	₩ 13,372,966
Due from financial institutions in Korean won
Restricted Cash And Cash Equivalents Items Line Items [Line Items]
Restricted due from financial institutions at amortized cost	[1]	12,561,246	11,701,097
The Bank of Korea
Restricted Cash And Cash Equivalents Items Line Items [Line Items]
Restricted due from financial institutions at amortized cost	[1]	₩ 11,242,803	₩ 8,117,840
Reason for restriction		Bank of Korea Act	Bank of Korea Act
Shinhan Bank and others [Member]
Restricted Cash And Cash Equivalents Items Line Items [Line Items]
Restricted due from financial institutions at amortized cost	[1]	₩ 772,986	₩ 3,027,963
Reason for restriction		Net settlement and others	Net settlement and others
NH Investment Securities And Others Member [Member]
Restricted Cash And Cash Equivalents Items Line Items [Line Items]
Restricted due from financial institutions at amortized cost	[1]	₩ 545,457	₩ 555,294
Reason for restriction		Derivatives margin account and others	Derivatives margin account and others
Due from financial institutions in foreign currencies
Restricted Cash And Cash Equivalents Items Line Items [Line Items]
Restricted due from financial institutions at amortized cost	[1]	₩ 2,742,117	₩ 1,671,869
People's Bank of China and others
Restricted Cash And Cash Equivalents Items Line Items [Line Items]
Restricted due from financial institutions at amortized cost	[1]	₩ 1,097,729	₩ 490,071
Reason for restriction		Cambodian law and others	Cambodian law and others
Bank of Communications Co., Ltd. New York Branch
Restricted Cash And Cash Equivalents Items Line Items [Line Items]
Restricted due from financial institutions at amortized cost	[1]	₩ 46,428	₩ 31,443
Reason for restriction		Bank Act of the State of New York and others	Bank Act of the State of New York and others
Societe Generale Paris And Others [Member]
Restricted Cash And Cash Equivalents Items Line Items [Line Items]
Restricted due from financial institutions at amortized cost	[1]	₩ 1,597,960	₩ 1,150,355
Reason for restriction		Derivatives margin account and others	Derivatives margin account and others
[1]	Before netting of allowance

Due From Financial Institutio_5

Due From Financial Institutions At Amortized Cost_Changes In The Allowances For Due From Financial Institutions Losses(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes In The Allowances For Due From Financial Institutions At Amortized Cost Losses Abstract [Abstract]
Provision (reversal) for credit losses	₩ 5,234	₩ (483)	₩ 138
Due from financial institutions measured at amortized cost | 12-month expected credit losses
Disclosure Of Changes In The Allowances For Due From Financial Institutions At Amortized Cost Losses Line Items [Line Items]
Beginning	3,164	2,019
Changes In The Allowances For Due From Financial Institutions At Amortized Cost Losses Abstract [Abstract]
Transfer to 12-month expected credit losses	0	0
Transfer to lifetime expected credit losses	0	0
Impairment	0	0
Disposal	0	0
Provision (reversal) for credit losses	(416)	1,116
Business combination	154
Others	45	29
Ending	2,947	3,164	2,019
Due from financial institutions measured at amortized cost | Non-impaired
Disclosure Of Changes In The Allowances For Due From Financial Institutions At Amortized Cost Losses Line Items [Line Items]
Beginning	1,188	0
Changes In The Allowances For Due From Financial Institutions At Amortized Cost Losses Abstract [Abstract]
Transfer to 12-month expected credit losses	0	0
Transfer to lifetime expected credit losses	0	0
Impairment	0	0
Disposal	0	0
Provision (reversal) for credit losses	(1,128)	1,210
Business combination	0
Others	(26)	(22)
Ending	34	1,188	0
Due from financial institutions measured at amortized cost | Impaired
Disclosure Of Changes In The Allowances For Due From Financial Institutions At Amortized Cost Losses Line Items [Line Items]
Beginning	360	0
Changes In The Allowances For Due From Financial Institutions At Amortized Cost Losses Abstract [Abstract]
Transfer to 12-month expected credit losses	0	0
Transfer to lifetime expected credit losses	0	0
Impairment	0	0
Disposal	0	0
Provision (reversal) for credit losses	0	360
Business combination	0
Others	(78)	0
Ending	₩ 282	₩ 360	₩ 0

Assets pledged as collateral_De

Assets pledged as collateral_Details Of Assets Pledged As Collateral(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 49,544,833	₩ 38,811,700
borrowing securities and securities held as collateral that group provides as collateral for Liabilities or Contingent Liabilities	4,680,816	7,320,220
Due from banking institutions | Korea Federation of Savings Banks and others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 1,293,930	₩ 3,752,497
Reason of pledge	Borrowings from the Bank of Korea	Borrowings from the Bank of Korea
Financial assets at fair value through profit or loss
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 18,473,401	₩ 16,396,936
Financial assets at fair value through profit or loss | The Korea Securities Depository and others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 10,733,047	₩ 7,561,287
Reason of pledge	Repurchase agreements	Repurchase agreements
Financial assets at fair value through profit or loss | The Korea Securities Depository and others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 7,009,580	₩ 7,745,154
Reason of pledge	Securities borrowing transactions	Securities borrowing transactions
Financial assets at fair value through profit or loss | Samsung Futures Inc. and others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 730,774	₩ 1,090,495
Reason of pledge	Derivatives transactions	Derivatives transactions
Financial assets at fair value through other comprehensive income
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 8,257,395	₩ 4,341,813
Financial assets at fair value through other comprehensive income | The Korea Securities Depository and others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 2,216,165	₩ 1,139,852
Reason of pledge	Repurchase agreements	Repurchase agreements
Financial assets at fair value through other comprehensive income | The Korea Securities Depository and others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 1,322,998	₩ 1,168,515
Reason of pledge	Securities borrowing transactions	Securities borrowing transactions
Financial assets at fair value through other comprehensive income | The Bank of Korea
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 2,837,452	₩ 1,212,021
Reason of pledge	Borrowings from The Bank of Korea	Borrowings from The Bank of Korea
Financial assets at fair value through other comprehensive income | The Bank of Korea
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 1,610,691	₩ 653,825
Reason of pledge	Settlement risk of the Bank of Korea	Settlement risk of the Bank of Korea
Financial assets at fair value through other comprehensive income | Samsung Futures Inc. and others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 270,089	₩ 167,600
Reason of pledge	Derivatives transactions	Derivatives transactions
Securities measured at amortized cost
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 9,339,444	₩ 6,168,064
Securities measured at amortized cost | The Korea Securities Depository and others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 664,438	₩ 581,268
Reason of pledge	Repurchase agreements	Repurchase agreements
Securities measured at amortized cost | The Bank of Korea
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 4,295,149	₩ 1,767,559
Reason of pledge	Borrowings from the Bank of Korea	Borrowings from The Bank of Korea
Securities measured at amortized cost | The Bank of Korea
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 3,677,922	₩ 3,077,151
Reason of pledge	Settlement risk of the Bank of Korea	Settlement risk of the Bank of Korea
Securities measured at amortized cost | Samsung Futures Inc. and others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 103,748	₩ 247,301
Reason of pledge	Derivatives transactions	Derivatives transactions
Securities measured at amortized cost | Others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 598,187	₩ 494,785
Reason of pledge	Others	Others
Mortgage loans | Others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 10,699,721	₩ 6,487,022
Reason of pledge	Covered bond	Covered bond
Real estate | Natixis Real Estate Capital LLC and others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount		₩ 1,665,368
Reason of pledge		Borrowings from Bank and others
Real estate | LGIM COMMERCIAL LENDING Ltd and others
Financial Instruments Owned And Pledged As Collateral Line Items [Line Items]
Carrying amount	₩ 1,480,942
Reason of pledge	Borrowings from bank and others

Assets pledged as collateral_Se

Assets pledged as collateral_Securities(Details) - Securities - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
The Fair Values Of Collateral Available To Sell Or Repledge And Collateral Sold Or Repledged Line Items [Line Items]
Fair value of collateral held	₩ 3,732,013	₩ 6,726,632
Fair value of collateral sold or repledged	0	0
Total	₩ 3,732,013	₩ 6,726,632

Derivative Financial Instrume_3

Derivative Financial Instruments and Hedge Accounting_Detailed Information About Held For Trading Instruments And Hedging Instruments(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		₩ 469,476,648	₩ 449,589,904
Assets		5,210,512	3,008,598
Liabilities		5,014,070	2,842,950
Fair value hedge
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		11,389,923	7,545,289
Assets		286,952	151,588
Liabilities		54,458	57,538
Changes in fair value		74,372	27,076
Cash Flow Hedge
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		6,389,915	6,214,235
Assets		42,121	27,080
Liabilities		153,244	101,551
Changes in fair value		(55,240)	(64,531)
Hedge of Net Investments in Foreign Operations
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		1,086,069	372,824
Assets		5,800	3,407
Liabilities		843,237	102,557
Changes in fair value		88,769	(13,410)
Interest rate | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		321,248,585	291,134,704
Assets		930,977	780,746
Liabilities		1,093,587	1,021,134
Forwards | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		1,824,000	570,000
Assets		50,580	206
Liabilities		107,218	84,126
Futures | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount	[1]	4,540,235	2,951,770
Assets	[1]	43	698
Liabilities	[1]	1,834	235
Swaps | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		300,105,350	270,091,778
Assets		631,917	512,145
Liabilities		682,401	557,511
Swaps | Fair value hedge
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		9,217,731	5,326,500
Assets		158,914	129,085
Liabilities		51,842	29,676
Changes in fair value		(23,022)	101,448
Swaps | Cash Flow Hedge
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		3,532,480	3,600,334
Assets		1,286	3,698
Liabilities		37,120	28,484
Changes in fair value		(11,940)	(25,997)
Options | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		14,779,000	17,521,156
Assets		248,437	267,697
Liabilities		302,134	379,262
Currency | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		130,766,525	136,772,171
Assets		3,643,775	1,554,534
Liabilities		3,364,865	1,375,350
Forwards | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		78,255,991	87,373,417
Assets		1,712,560	942,632
Liabilities		1,986,239	750,380
Forwards | Fair value hedge
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		2,172,192	2,218,789
Assets		128,038	22,503
Liabilities		2,616	27,862
Changes in fair value		97,394	(74,372)
Forwards | Hedge of Net Investments in Foreign Operations
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		243,957	275,569
Assets		5,800	3,407
Liabilities		1,125	5,302
Changes in fair value		14,406	(10,330)
Futures | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount	[1]	376,281	107,793
Assets	[1]	158	0
Liabilities	[1]	695	349
Swaps | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		49,756,478	46,501,399
Assets		1,897,636	606,464
Liabilities		1,349,919	610,275
Swaps | Cash Flow Hedge
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		2,857,435	2,613,901
Assets		40,835	23,382
Liabilities		116,124	73,067
Changes in fair value		(43,300)	(38,534)
Options | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		2,377,775	2,789,562
Assets		33,421	5,438
Liabilities		28,012	14,346
Stock and index | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		12,943,914	13,980,117
Assets		579,163	570,267
Liabilities		400,770	282,945
Futures | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount	[1]	1,027,347	1,646,785
Assets	[1]	20,061	22,451
Liabilities	[1]	2,246	20,704
Swaps | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		5,434,057	6,773,467
Assets		423,297	448,803
Liabilities		123,242	86,100
Options | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		6,482,510	5,559,865
Assets		135,805	99,013
Liabilities		275,282	176,141
Credit | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		3,015,782	4,433,960
Assets		19,395	19,178
Liabilities		9,700	13,659
Swaps | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		3,015,782	4,433,960
Assets		19,395	19,178
Liabilities		9,700	13,659
Commodity | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		25,532	108,939
Assets		419	3,016
Liabilities		1,072	477
Futures | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount	[1]	11,609	3,281
Assets	[1]	151	68
Liabilities	[1]	81	3
Swaps | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		13,923	105,658
Assets		268	2,948
Liabilities		991	474
Other | Held For Trading
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		1,476,310	3,160,013
Assets		36,783	80,857
Liabilities		144,076	149,385
Debentures in foreign currencies | Hedge of Net Investments in Foreign Operations
Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items]
Notional amount		842,112	97,255
Assets		0	0
Liabilities		842,112	97,255
Changes in fair value		₩ 74,363	₩ (3,080)
[1]	Gains or losses arising from daily mark-to-market futures are reflected in the margin accounts.

Derivative Financial Instrume_4

Derivative Financial Instruments and Hedge Accounting_Average Of Hedge Ratio For Each Type Of Hedge Accounting(Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)	Dec. 31, 2019KRW (₩)
Fair value hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	11,389,923	7,545,289
Average interest rate	0.0097	0.0291
Fair value hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,157.28	1,146.84
Fair value hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,353.36	1,327.68
Fair value hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	835.43	803.71
Fair value hedge | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,546.54
Cash Flow Hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	6,389,915	6,214,235
Average interest rate	0.0136	0.0259
Cash Flow Hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,152.37	1,132.99
Cash Flow Hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,312.93	1,306.91
Cash Flow Hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	837	837
Cash Flow Hedge | SGD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	858.33	823.54
Hedge of net investments in foreign operations
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	243,957	275,569
Hedge of net investments in foreign operations | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,111.45	1,151.49
Hedge of net investments in foreign operations | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,465.26	1,465.26
1 year | Fair value hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	5,266,994	2,649,272
Average interest rate	0.0076	0.0229
1 year | Fair value hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,160.33	1,149.9
1 year | Fair value hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,353.28	1,319.66
1 year | Fair value hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	835.43	803.71
1 year | Fair value hedge | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,546.54
1 year | Cash Flow Hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	2,568,922	2,450,918
Average interest rate	0.0083	0.0264
1 year | Cash Flow Hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,113.33	1,129.58
1 year | Cash Flow Hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,306.76	1,305.22
1 year | Cash Flow Hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	837	0
1 year | Cash Flow Hedge | SGD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	831.49	815.8
1 year | Hedge of net investments in foreign operations
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	217,274	248,233
1 year | Hedge of net investments in foreign operations | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,111.45	1,151.49
1 year | Hedge of net investments in foreign operations | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
2 years | Fair value hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	1,083,877	1,807,950
Average interest rate	0.0081	0.027
2 years | Fair value hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,115.45	1,138.82
2 years | Fair value hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	1,346.38
2 years | Fair value hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
2 years | Fair value hedge | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0
2 years | Cash Flow Hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	1,767,357	1,199,124
Average interest rate	0.0166	0.0256
2 years | Cash Flow Hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,160.46	1,111.66
2 years | Cash Flow Hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,312.75	1,306.76
2 years | Cash Flow Hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	837
2 years | Cash Flow Hedge | SGD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	831.49
2 years | Hedge of net investments in foreign operations
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	26,683	0
2 years | Hedge of net investments in foreign operations | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
2 years | Hedge of net investments in foreign operations | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,465.26	0
3 years | Fair value hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	512,608	897,562
Average interest rate	0.01	0.0229
3 years | Fair value hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,151.5	1,094.35
3 years | Fair value hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,366.3	0
3 years | Fair value hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
3 years | Fair value hedge | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0
3 years | Cash Flow Hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	1,277,053	1,764,991
Average interest rate	0.0248	0.0266
3 years | Cash Flow Hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,181.36	1,153.15
3 years | Cash Flow Hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,321	1,312.75
3 years | Cash Flow Hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
3 years | Cash Flow Hedge | SGD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	866.14	0
3 years | Hedge of net investments in foreign operations
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	0	27,336
3 years | Hedge of net investments in foreign operations | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
3 years | Hedge of net investments in foreign operations | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	1,465.26
4 years | Fair value hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	620,788	309,882
Average interest rate	0.0107	0.0316
4 years | Fair value hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
4 years | Fair value hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
4 years | Fair value hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
4 years | Fair value hedge | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0
4 years | Cash Flow Hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	166,643	529,202
Average interest rate	0.02	0.0279
4 years | Cash Flow Hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,128.3	1,095.73
4 years | Cash Flow Hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
4 years | Cash Flow Hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
4 years | Cash Flow Hedge | SGD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
4 years | Hedge of net investments in foreign operations
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	0	0
4 years | Hedge of net investments in foreign operations | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
4 years | Hedge of net investments in foreign operations | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
5 years | Fair value hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	1,462,964	466,053
Average interest rate	0.0121	0.025
5 years | Fair value hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
5 years | Fair value hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
5 years | Fair value hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
5 years | Fair value hedge | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0
5 years | Cash Flow Hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	509,940	120,000
Average interest rate	0.0163	0.02
5 years | Cash Flow Hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,142.05	0
5 years | Cash Flow Hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	1,340.64	0
5 years | Cash Flow Hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
5 years | Cash Flow Hedge | SGD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
5 years | Hedge of net investments in foreign operations
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	0	0
5 years | Hedge of net investments in foreign operations | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
5 years | Hedge of net investments in foreign operations | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
Over 5 years | Fair value hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	2,442,692	1,414,570
Average interest rate	0.0114	0.0392
Over 5 years | Fair value hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
Over 5 years | Fair value hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
Over 5 years | Fair value hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
Over 5 years | Fair value hedge | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0
Over 5 years | Cash Flow Hedge
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	100,000	150,000
Average interest rate	0.0167	0.0167
Over 5 years | Cash Flow Hedge | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
Over 5 years | Cash Flow Hedge | EUR
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
Over 5 years | Cash Flow Hedge | AUD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
Over 5 years | Cash Flow Hedge | SGD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
Over 5 years | Hedge of net investments in foreign operations
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Nominal amount of the hedging instrument	0	0
Over 5 years | Hedge of net investments in foreign operations | USD
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0
Over 5 years | Hedge of net investments in foreign operations | GBP
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [Line Items]
Average foreign exchange rate	0	0

Derivative Financial Instrume_5

Derivative Financial Instruments and Hedge Accounting_Details Of Hedged Item(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Disclosure of detailed information about hedged items [Line Items]
Cash flow hedge reserve	[1],[2]	₩ (1,264)	$ (1,164)	₩ (33,182)	₩ (9,038)
Foreign currency translation reserve	[1],[2]	64,269	$ 59,174	(8,900)	₩ (27,134)
Fair value hedge
Disclosure of detailed information about hedged items [Line Items]
Carrying amount - Assets		6,384,347		4,559,603
Carrying amount - Liabilities		5,730,262		3,199,117
Accumulated amount of hedge adjustments - Assets		379,555		48,909
Accumulated amount of hedge adjustments - Liabilities		76,582		44,085
Changes in fair value		(11,946)		(37,562)
Cash Flow Hedge
Disclosure of detailed information about hedged items [Line Items]
Changes in fair value		13,237		68,028
Cash flow hedge reserve		(28,597)		(27,333)
Interest rate | Fair value hedge
Disclosure of detailed information about hedged items [Line Items]
Carrying amount - Assets		3,714,937		2,220,364
Carrying amount - Liabilities		5,730,262		3,199,117
Accumulated amount of hedge adjustments - Assets		68,810		24,728
Accumulated amount of hedge adjustments - Liabilities		76,582		44,085
Changes in fair value		28,764		(98,695)
Interest rate | Cash Flow Hedge
Disclosure of detailed information about hedged items [Line Items]
Changes in fair value		12,172		25,671
Cash flow hedge reserve		(22,439)		(15,670)
Debt securities in Korean won | Fair value hedge
Disclosure of detailed information about hedged items [Line Items]
Carrying amount - Assets		1,001,957		549,526
Carrying amount - Liabilities		0		0
Accumulated amount of hedge adjustments - Assets		5,888		5,485
Accumulated amount of hedge adjustments - Liabilities		0		0
Changes in fair value		402		5,502
Debt securities in foreign currencies | Fair value hedge
Disclosure of detailed information about hedged items [Line Items]
Carrying amount - Assets		2,712,980		1,670,838
Carrying amount - Liabilities		0		0
Accumulated amount of hedge adjustments - Assets		62,922		19,243
Accumulated amount of hedge adjustments - Liabilities		0		0
Changes in fair value		42,382		25,540
Deposits in foreign currencies | Fair value hedge
Disclosure of detailed information about hedged items [Line Items]
Carrying amount - Assets		0		0
Carrying amount - Liabilities		121,768		780,491
Accumulated amount of hedge adjustments - Assets		0		0
Accumulated amount of hedge adjustments - Liabilities		2,088		(18,391)
Changes in fair value		(4,491)		(62,439)
Debentures in Korean won | Fair value hedge
Disclosure of detailed information about hedged items [Line Items]
Carrying amount - Assets		0		0
Carrying amount - Liabilities		3,623,161		351,070
Accumulated amount of hedge adjustments - Assets		0		0
Accumulated amount of hedge adjustments - Liabilities		(6,839)		21,070
Changes in fair value		27,909		(1,818)
Debentures in foreign currencies | Fair value hedge
Disclosure of detailed information about hedged items [Line Items]
Carrying amount - Assets		0		0
Carrying amount - Liabilities		1,985,333		2,067,556
Accumulated amount of hedge adjustments - Assets		0		0
Accumulated amount of hedge adjustments - Liabilities		81,333		41,406
Changes in fair value		(37,438)		(65,480)
Currency | Fair value hedge
Disclosure of detailed information about hedged items [Line Items]
Carrying amount - Assets		2,669,410		2,339,239
Carrying amount - Liabilities		0		0
Accumulated amount of hedge adjustments - Assets		310,745		24,181
Accumulated amount of hedge adjustments - Liabilities		0		0
Changes in fair value		(40,710)		61,133
Currency | Cash Flow Hedge
Disclosure of detailed information about hedged items [Line Items]
Changes in fair value		1,065		42,357
Cash flow hedge reserve		(6,158)		(11,663)
Currency | Hedge of net investments in foreign operations
Disclosure of detailed information about hedged items [Line Items]
Changes in fair value		(88,769)		13,410
Foreign currency translation reserve		22,278		(41,992)
Debt securities in foreign currencies | Fair value hedge
Disclosure of detailed information about hedged items [Line Items]
Carrying amount - Assets		2,669,410		2,339,239
Carrying amount - Liabilities		0		0
Accumulated amount of hedge adjustments - Assets		310,745		24,181
Accumulated amount of hedge adjustments - Liabilities		0		0
Changes in fair value		₩ (40,710)		₩ 61,133
[1]	The consolidated statements of changes in equity for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Derivative Financial Instrume_6

Derivative Financial Instruments and Hedge Accounting_Gains And Losses From Hedging Instruments(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gains And Losses From Hedging Instruments And Hedged Items Attributable To The Hedged [Abstract]
Income tax effect	₩ (24,500)	₩ 3,194	₩ 10,292
Fair value hedge
Gains And Losses From Hedging Instruments And Hedged Items Attributable To The Hedged [Abstract]
Hedge ineffectiveness recognized in profit or loss	62,426	(10,486)	(19,508)
Gains(losses) on hedging instruments	89,179	34,070	(160,416)
Gains(losses) on the hedged items attributable to the hedged risk	(26,899)	(44,655)	135,556
Total	62,280	(10,585)	(24,860)
Interest rate
Gains And Losses From Hedging Instruments And Hedged Items Attributable To The Hedged [Abstract]
Hedge ineffectiveness recognized in profit or loss	5,742	2,753	1,186
Currency
Gains And Losses From Hedging Instruments And Hedged Items Attributable To The Hedged [Abstract]
Hedge ineffectiveness recognized in profit or loss	56,684	(13,239)	(20,694)
Cash Flow Hedge
Gains And Losses From Hedging Instruments And Hedged Items Attributable To The Hedged [Abstract]
Gains(losses) on hedging instruments	(55,240)	(64,531)	(23,022)
Effective portion of losses on cash flow hedging instruments (amount recognized in other comprehensive income)	(48,034)	(65,323)	(24,672)
Ineffective portion of losses on cash flow hedging instruments (amount recognized in profit or loss)	(7,206)	792	1,650
Reclassification to profit or loss	39,190	21,604	15,234
Income tax effect	7,580	10,537	400
Other comprehensive income (loss) after tax	(1,264)	(33,182)	(9,038)
Hedge of net investments in foreign operations
Gains And Losses From Hedging Instruments And Hedged Items Attributable To The Hedged [Abstract]
Gains(losses) on hedging instruments	88,769	(13,410)	(25,096)
Effective portion of gains(losses) on hedge of net investments in foreign operations(amount recognized in other comprehensive income)	88,769	(13,410)	(25,096)
Ineffective portion of gains(losses) on hedge of net investments in foreign operations (amount recognized in profit or loss)	0	0	0
Reclassification to profit or loss	0	1,316	(12,330)
Income tax effect	(24,500)	3,194	10,292
Other comprehensive income (loss) after tax	₩ 64,269	₩ (8,900)	₩ (27,134)

Derivative Financial Instrume_7

Derivative Financial Instruments and Hedge Accounting_Fair Value Of Non-Derivative Financial Instruments(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Hedge of Net Investments in Foreign Operations
Non Derivative Financial Instruments Designated As Hedging Instruments At Fair Value [Line Items]
Debentures in foreign currencies	₩ 852,570	₩ 97,737

Derivative Financial Instrume_8

Derivative Financial Instruments and Hedge Accounting_Interest Rate Benchmark Reform(Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)
Exposure to Hedging Relationships Related to the Interest Rate Benchmark Reform [Line Items]
Description of Interest Rate Benchmark Reform	The Group's exposure to hedging relationships related to the interest rate benchmark reform as of December 31, 2020, is as follows. The USD LIBOR interest rate will be replaced by the Secured Overnight Financing Rate ("SOFR") based on actual transactions starting in 2022 and the KRW CD rate is currently under consideration for improving the calculation methodology. In this hedging relationship, the Group assumed that the spread to be changed on a SOFR basis in 2022 would be similar to that included in the interest rate swap used as a hedging instrument, and no other changes were assumed.
KRW CD 3M
Exposure to Hedging Relationships Related to the Interest Rate Benchmark Reform [Line Items]
Description of Interest Rate Benchmark	CD#3M
Carrying Amount of Non-derivative Assets	₩ 1,807,701
Carrying Amount of Non-derivative Liabilities	3,623,161
Notional amount of hedging instruments	₩ 5,430,000
USD LIBOR 3M
Exposure to Hedging Relationships Related to the Interest Rate Benchmark Reform [Line Items]
Description of Interest Rate Benchmark	USD#LIBOR#3M
Carrying Amount of Non-derivative Assets	₩ 78,083
Carrying Amount of Non-derivative Liabilities	3,276
Notional amount of hedging instruments	₩ 82,907
USD LIBOR 6M
Exposure to Hedging Relationships Related to the Interest Rate Benchmark Reform [Line Items]
Description of Interest Rate Benchmark	USD#LIBOR#6M
Carrying Amount of Non-derivative Assets	₩ 213
Carrying Amount of Non-derivative Liabilities	10
Notional amount of hedging instruments	₩ 206

Loans Measured at Amortized C_3

Loans Measured at Amortized Cost Details of Loans(Details) $ in Thousands, ₩ in Millions	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Details Of Loans Line Items [Line Items]
Loans measured at amortized cost	₩ 377,166,984	$ 347,264,074	₩ 339,684,059
Loans measured at amortized cost
Details Of Loans Line Items [Line Items]
Loans measured at amortized cost	379,734,020		341,363,805
Deferred loan origination fees and costs
Details Of Loans Line Items [Line Items]
Loans measured at amortized cost	716,327		728,270
Allowances for credit losses
Details Of Loans Line Items [Line Items]
Loans measured at amortized cost	₩ (3,283,363)		₩ (2,408,016)

Loans Measured at Amortized C_4

Loans Measured at Amortized Cost Details of Loans for Other Banks(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Details Of Loans Other Than Banks Line Items [Line Items]
Loans to banks	₩ 5,577,046	₩ 4,010,814
Loans measured at amortized cost
Details Of Loans Other Than Banks Line Items [Line Items]
Loans to banks	5,577,728	4,011,246
Allowances for credit losses
Details Of Loans Other Than Banks Line Items [Line Items]
Loans to banks	₩ (682)	₩ (432)

Loans Measured at Amortized C_5

Loans Measured at Amortized Cost Details of Loan Types and Customer Types of Loans to Customers other than Banks(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	₩ 371,589,938	₩ 335,673,245
Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Proportions (%)	100.00%	100.00%
Loans Excluding In Other Than Banks	₩ 374,872,619	₩ 338,080,829
Allowances for credit losses
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	(3,282,681)	(2,407,584)
Loans in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	317,874,938	289,615,755
Loans in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	19,252,352	8,558,428
Domestic import usance bills | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	2,152,059	2,617,862
Off-shore funding loans | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,203,737	1,387,798
Call loans | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,582,251	610,001
Bills bought in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,620	2,843
Bills bought in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,739,262	2,158,877
Guarantee payments under acceptances and guarantees | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	8,021	3,348
Credit card receivables in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	18,734,560	18,642,111
Credit card receivables in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	63,071	6,299
Bonds purchased under repurchase agreements | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	3,175,080	6,149,458
Privately placed bonds | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,154,162	971,414
Factored receivables | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	107	284
Lease receivables | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,440,583	1,580,193
Loans for installment credit | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	6,490,816	5,776,158
Retail
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	₩ 184,790,365	₩ 166,077,800
Retail | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Proportions (%)	49.54%	49.33%
Loans Excluding In Other Than Banks	₩ 185,700,453	₩ 166,789,122
Retail | Allowances for credit losses
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	(910,088)	(711,322)
Retail | Loans in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	175,062,187	159,232,495
Retail | Loans in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	3,092,630	433,399
Retail | Domestic import usance bills | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Retail | Off-shore funding loans | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Retail | Call loans | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Retail | Bills bought in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Retail | Bills bought in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Retail | Guarantee payments under acceptances and guarantees | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	10	36
Retail | Credit card receivables in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Retail | Credit card receivables in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Retail | Bonds purchased under repurchase agreements | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Retail | Privately placed bonds | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Retail | Factored receivables | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	104	117
Retail | Lease receivables | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,105,001	1,385,617
Retail | Loans for installment credit | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	6,440,521	5,737,458
Corporate
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	₩ 168,703,437	₩ 151,686,743
Corporate | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Proportions (%)	45.45%	45.15%
Loans Excluding In Other Than Banks	₩ 170,374,535	₩ 152,643,297
Corporate | Allowances for credit losses
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	(1,671,098)	(956,554)
Corporate | Loans in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	142,812,751	130,383,260
Corporate | Loans in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	16,159,722	8,125,029
Corporate | Domestic import usance bills | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	2,152,059	2,617,862
Corporate | Off-shore funding loans | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,203,737	1,387,798
Corporate | Call loans | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,582,251	610,001
Corporate | Bills bought in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,620	2,843
Corporate | Bills bought in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,739,262	2,158,877
Corporate | Guarantee payments under acceptances and guarantees | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	8,011	3,312
Corporate | Credit card receivables in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Corporate | Credit card receivables in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Corporate | Bonds purchased under repurchase agreements | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	3,175,080	6,149,458
Corporate | Privately placed bonds | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	1,154,162	971,414
Corporate | Factored receivables | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	3	167
Corporate | Lease receivables | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	335,582	194,576
Corporate | Loans for installment credit | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	50,295	38,700
Credit card
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	₩ 18,096,136	₩ 17,908,702
Credit card | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Proportions (%)	5.01%	5.52%
Loans Excluding In Other Than Banks	₩ 18,797,631	₩ 18,648,410
Credit card | Allowances for credit losses
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	(701,495)	(739,708)
Credit card | Loans in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Loans in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Domestic import usance bills | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Off-shore funding loans | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Call loans | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Bills bought in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Bills bought in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Guarantee payments under acceptances and guarantees | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Credit card receivables in Korean won | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	18,734,560	18,642,111
Credit card | Credit card receivables in foreign currencies | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	63,071	6,299
Credit card | Bonds purchased under repurchase agreements | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Privately placed bonds | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Factored receivables | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Lease receivables | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	0	0
Credit card | Loans for installment credit | Gross Carrying Amount [Member]
Details Of Loans Excluding In Other Than Banks [Line Items]
Loans Excluding In Other Than Banks	₩ 0	₩ 0

Loans Measured at Amortized C_6

Loans Measured at Amortized Cost the Changes in Deferred Loan Origination Fees and Costs(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Deferred Loan Origination Fees And Costs Line Items [Line Items]
Beginning		₩ 728,270		₩ 753,126
Reconciliation Of Changes In Deferred Loan Origination Fees And Costs Abstract [Abstract]
Increase		527,072		432,797
Decrease		(504,372)		(457,652)
Business combination		(38,741)
Others		4,098		(1)
Ending		716,327		728,270
Deferred loan origination costs
Deferred Loan Origination Fees And Costs Line Items [Line Items]
Beginning		741,683		784,017
Reconciliation Of Changes In Deferred Loan Origination Fees And Costs Abstract [Abstract]
Increase		555,389		443,450
Decrease		(536,901)		(485,784)
Business combination		9,376
Others		0		0
Ending		769,547		741,683
Loans in Korean won
Deferred Loan Origination Fees And Costs Line Items [Line Items]
Beginning		645,305		664,237
Reconciliation Of Changes In Deferred Loan Origination Fees And Costs Abstract [Abstract]
Increase		502,044		387,420
Decrease		(473,392)		(406,352)
Business combination		0
Others		0		0
Ending		673,957		645,305
Others
Deferred Loan Origination Fees And Costs Line Items [Line Items]
Beginning		96,378	[1]	119,780
Reconciliation Of Changes In Deferred Loan Origination Fees And Costs Abstract [Abstract]
Increase		53,345	[1]	56,030
Decrease		(63,509)	[1]	(79,432)
Business combination	[1]	9,376
Others		0	[1]	0
Ending	[1]	95,590		96,378
Deferred loan origination fees
Deferred Loan Origination Fees And Costs Line Items [Line Items]
Beginning		13,413		30,891
Reconciliation Of Changes In Deferred Loan Origination Fees And Costs Abstract [Abstract]
Increase		28,317		10,653
Decrease		(32,529)		(28,132)
Business combination		48,117
Others		(4,098)		1
Ending		53,220		13,413
Loans in Korean won
Deferred Loan Origination Fees And Costs Line Items [Line Items]
Beginning		8,600		9,055
Reconciliation Of Changes In Deferred Loan Origination Fees And Costs Abstract [Abstract]
Increase		6,681		7,238
Decrease		(6,133)		(7,693)
Business combination		0
Others		0		0
Ending		9,148		8,600
Others
Deferred Loan Origination Fees And Costs Line Items [Line Items]
Beginning		4,813	[2]	21,836
Reconciliation Of Changes In Deferred Loan Origination Fees And Costs Abstract [Abstract]
Increase		21,636	[2]	3,415
Decrease		(26,396)	[2]	(20,439)
Business combination	[2]	48,117
Others		(4,098)	[2]	1
Ending	[2]	₩ 44,072		₩ 4,813
[1]	Includes deferred loan origination costs to credit card receivables, loans for installment credit and financial lease receivables.
[2]	Includes deferred loan origination fees to loans in foreign currencies from PT Bank Bukopin TBK and PRASAC Microfinance Institution Limited.

Allowances for Credit Losses Ch

Allowances for Credit Losses Changes in the Allowances for Loan Losses(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Changes In Allowance Account For Credit Losses Of Loans Abstract [Abstract]
Provision (reversal) for credit losses		₩ 5,234		₩ (483)	₩ 138
Loans measured at amortized cost | Retail | 12-month expected credit losses
Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans Line Items [Line Items]
Beginning		278,380		237,440
Changes In Allowance Account For Credit Losses Of Loans Abstract [Abstract]
Transfer to 12-month expected credit losses		123,666		168,460
Transfer to lifetime expected credit losses		(91,410)		(144,590)
Impairment		(3,301)		(1,619)
Write-offs		0		(2)
Sales		(1,561)		(486)
Provision (reversal) for credit losses	[1],[3]	49,459	[2]	19,152
Business combination		50,664
Others (exchange differences, etc.)		(2,092)		25
Ending		403,805		278,380	237,440
Loans measured at amortized cost | Retail | Non-impaired
Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans Line Items [Line Items]
Beginning		224,905		215,743
Changes In Allowance Account For Credit Losses Of Loans Abstract [Abstract]
Transfer to 12-month expected credit losses		(121,970)		(167,957)
Transfer to lifetime expected credit losses		182,076		160,509
Impairment		(131,852)		(54,736)
Write-offs		(5)
Recoveries from written off loans				24
Sales		(99)		(70)
Provision (reversal) for credit losses	[1],[3]	78,413	[2]	71,231
Business combination		9,545
Others (exchange differences, etc.)		(435)		161
Ending		240,578		224,905	215,743
Loans measured at amortized cost | Retail | Impaired
Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans Line Items [Line Items]
Beginning		208,037		189,714
Changes In Allowance Account For Credit Losses Of Loans Abstract [Abstract]
Transfer to 12-month expected credit losses		(1,696)		(503)
Transfer to lifetime expected credit losses		(90,666)		(15,919)
Impairment		135,153		56,355
Write-offs		(460,734)		(443,034)
Sales		(1,131)		(782)
Provision (reversal) for credit losses	[1],[3]	428,220	[2]	424,758
Business combination		53,532
Others (exchange differences, etc.)		(5,010)		(2,552)
Ending		265,705		208,037	189,714
Loans measured at amortized cost | Corporate | 12-month expected credit losses
Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans Line Items [Line Items]
Beginning		215,069		214,312
Changes In Allowance Account For Credit Losses Of Loans Abstract [Abstract]
Transfer to 12-month expected credit losses		119,723		59,848
Transfer to lifetime expected credit losses		(56,655)		(53,696)
Impairment		(3,365)		(2,250)
Write-offs		0		0
Sales		(8)		0
Provision (reversal) for credit losses	[1],[3]	(2,059)	[2]	(3,540)
Business combination		99,824
Others (exchange differences, etc.)		(3,747)		395
Ending		368,782		215,069	214,312
Loans measured at amortized cost | Corporate | Non-impaired
Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans Line Items [Line Items]
Beginning		290,310		318,656
Changes In Allowance Account For Credit Losses Of Loans Abstract [Abstract]
Transfer to 12-month expected credit losses		(111,708)		(46,312)
Transfer to lifetime expected credit losses		146,690		141,398
Impairment		(48,773)		(36,656)
Write-offs		(1)
Recoveries from written off loans				2
Sales		0		0
Provision (reversal) for credit losses	[1],[3]	113,335	[2]	(89,234)
Business combination		24,303
Others (exchange differences, etc.)		(3,219)		2,456
Ending		410,937		290,310	318,656
Loans measured at amortized cost | Corporate | Impaired
Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans Line Items [Line Items]
Beginning		451,607		722,875
Changes In Allowance Account For Credit Losses Of Loans Abstract [Abstract]
Transfer to 12-month expected credit losses		(8,015)		(13,536)
Transfer to lifetime expected credit losses		(90,035)		(87,702)
Impairment		52,138		38,906
Write-offs		(321,583)		(239,319)
Sales		(21,069)		(8,909)
Provision (reversal) for credit losses	[1],[3]	180,162	[2]	80,216
Business combination		668,426
Others (exchange differences, etc.)		(19,570)		(40,924)
Ending		892,061		451,607	722,875
Loans measured at amortized cost | Credit card | 12-month expected credit losses
Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans Line Items [Line Items]
Beginning		209,651		180,467
Changes In Allowance Account For Credit Losses Of Loans Abstract [Abstract]
Transfer to 12-month expected credit losses		48,959		51,542
Transfer to lifetime expected credit losses		(25,227)		(23,537)
Impairment		(2,273)		(2,388)
Write-offs		0		0
Sales		0		0
Provision (reversal) for credit losses	[1],[3]	(26,042)	[2]	3,567
Business combination		89
Others (exchange differences, etc.)		0		0
Ending		205,157		209,651	180,467
Loans measured at amortized cost | Credit card | Non-impaired
Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans Line Items [Line Items]
Beginning		266,183		290,025
Changes In Allowance Account For Credit Losses Of Loans Abstract [Abstract]
Transfer to 12-month expected credit losses		(47,611)		(50,627)
Transfer to lifetime expected credit losses		26,379		24,529
Impairment		(13,657)		(14,377)
Write-offs		0		0
Sales		0		0
Provision (reversal) for credit losses	[1],[3]	2,925	[2]	16,633
Business combination		0
Others (exchange differences, etc.)		0		0
Ending		234,219		266,183	290,025
Loans measured at amortized cost | Credit card | Impaired
Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans Line Items [Line Items]
Beginning		263,874		240,449
Changes In Allowance Account For Credit Losses Of Loans Abstract [Abstract]
Transfer to 12-month expected credit losses		(1,348)		(915)
Transfer to lifetime expected credit losses		(1,152)		(992)
Impairment		15,930		16,765
Write-offs		(502,275)		(506,255)
Sales		0		0
Provision (reversal) for credit losses	[1],[3]	496,162	[2]	524,652
Business combination		4,409
Others (exchange differences, etc.)		(13,481)		(9,830)
Ending		₩ 262,119		₩ 263,874	₩ 240,449
[1]	Includes KRW 390,041 million and KRW 379,179 million of collections from written-off loans for the years ended December 31, 2019 and 2020, respectively.
[2]	Includes additional provision of KRW 43,777 million for industries and borrowers which are highly affected by COVID-19, KRW 29,861 million due to expanding the scope of the loans subject to lifetime expected credit losses (non-impaired) and KRW 23,325 million due to expanding the scope of the loans subject to individual assessment for the year ended December 31, 2020.
[3]	Provision for credit losses in the consolidated statements of comprehensive income also include provision (reversal) for credit losses of due from financial institutions (Note 7.3), and provision (reversal) for credit losses of financial investments (Note 12.5), provision for credit losses of unused commitments and guarantees (Note 24.2), provision (reversal) for credit losses of financial guarantees contracts (Note 24.3), and provision (reversal) for credit losses of other financial assets (Note 19.2).

Allowances for Credit Losses _2

Allowances for Credit Losses Changes in the Book Value of Loans at Amortized Cost(Details) - Loans measured at amortized cost - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
12-month expected credit losses
Disclosure Of Changes In The Book Value Of Loans At Amortized Cost Line Items [Line Items]
Beginning	₩ 316,377,009	₩ 293,296,370
Changes In The Book Value Of Loans At Amortized Cost Abstract [Abstract]
Transfer to 12-month expected credit losses	26,751,021	54,530,173
Transfer to lifetime expected credit losses (non-impaired)	(33,475,491)	(57,514,696)
Transfer to lifetime expected credit losses (impaired)	(596,861)	(564,375)
Write-offs	0	(2)
Sales	(4,324,146)	(889,880)
Business combination	7,029,580
Net increase(decrease) (Execution, repayment and others)	36,757,668	27,519,419
Ending	348,518,780	316,377,009
Non-impaired
Disclosure Of Changes In The Book Value Of Loans At Amortized Cost Line Items [Line Items]
Beginning	23,814,108	26,417,165
Changes In The Book Value Of Loans At Amortized Cost Abstract [Abstract]
Transfer to 12-month expected credit losses	(26,629,210)	(54,412,664)
Transfer to lifetime expected credit losses (non-impaired)	34,603,648	58,078,679
Transfer to lifetime expected credit losses (impaired)	(2,287,196)	(1,792,641)
Write-offs	(6)	26
Sales	(20,907)	(18,163)
Business combination	570,710
Net increase(decrease) (Execution, repayment and others)	(1,546,945)	(4,458,294)
Ending	28,504,202	23,814,108
Impaired
Disclosure Of Changes In The Book Value Of Loans At Amortized Cost Line Items [Line Items]
Beginning	1,900,958	2,097,749
Changes In The Book Value Of Loans At Amortized Cost Abstract [Abstract]
Transfer to 12-month expected credit losses	(121,811)	(117,509)
Transfer to lifetime expected credit losses (non-impaired)	(1,128,157)	(563,983)
Transfer to lifetime expected credit losses (impaired)	2,884,057	2,357,016
Write-offs	(1,284,592)	(1,188,608)
Sales	(200,182)	(188,080)
Business combination	1,711,823
Net increase(decrease) (Execution, repayment and others)	(334,731)	(495,627)
Ending	₩ 3,427,365	₩ 1,900,958

Financial Assets at Fair Valu_3

Financial Assets at Fair Value through Profit or Loss and Financial Investments_Financial Assets At Fair Value Through Profit Or Loss And Financial Investments(Details) $ in Thousands, ₩ in Millions	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	₩ 61,035,455	$ 56,196,385	₩ 53,549,086
Financial Investments Abstract [Abstract]
Financial investments	98,695,426	$ 90,870,562	71,782,606
Financial assets at fair value through profit or loss
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	61,035,455		53,549,086
Financial assets at fair value through profit or loss | Government and public bonds
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	9,315,317		6,569,472
Financial assets at fair value through profit or loss | Financial bonds
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	17,897,348		16,360,495
Financial assets at fair value through profit or loss | Corporate bonds
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	3,997,753		3,218,480
Financial assets at fair value through profit or loss | Asset-backed securities
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	236,130		124,898
Financial assets at fair value through profit or loss | Beneficiary certificates
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	14,200,802		12,375,326
Financial assets at fair value through profit or loss | Derivatives linked securities
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	2,218,502		3,623,648
Financial assets at fair value through profit or loss | Other debt securities
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	10,549,248		8,449,207
Financial assets at fair value through profit or loss | Stocks
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	1,632,619		1,716,149
Financial assets at fair value through profit or loss | Other equity securities
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	459,694		387,694
Financial assets at fair value through profit or loss | Privately placed bonds
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	212,021		265,499
Financial assets at fair value through profit or loss | Other loans
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	125,962		162,046
Financial assets at fair value through profit or loss | Other due from financial institutions
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	100,094		216,367
Financial assets at fair value through profit or loss | Others
Financial assets at fair value through profit or loss [Abstract]
Financial assets at fair value through profit or loss	89,965		79,805
Financial assets at fair value through other comprehensive income
Financial Investments Abstract [Abstract]
Financial assets at fair value through other comprehensive income	61,825,197		46,436,051
Financial assets at fair value through other comprehensive income | Government and public bonds
Financial Investments Abstract [Abstract]
Financial assets at fair value through other comprehensive income	14,735,340		9,501,642
Financial assets at fair value through other comprehensive income | Financial bonds
Financial Investments Abstract [Abstract]
Financial assets at fair value through other comprehensive income	23,194,387		20,913,361
Financial assets at fair value through other comprehensive income | Corporate bonds
Financial Investments Abstract [Abstract]
Financial assets at fair value through other comprehensive income	18,721,327		12,289,820
Financial assets at fair value through other comprehensive income | Asset-backed securities
Financial Investments Abstract [Abstract]
Financial assets at fair value through other comprehensive income	1,795,840		832,160
Financial assets at fair value through other comprehensive income | Other debt securities
Financial Investments Abstract [Abstract]
Financial assets at fair value through other comprehensive income	9,995		19,865
Financial assets at fair value through other comprehensive income | Stocks
Financial Investments Abstract [Abstract]
Financial assets at fair value through other comprehensive income	2,852,158		2,377,994
Financial assets at fair value through other comprehensive income | Other equity securities
Financial Investments Abstract [Abstract]
Financial assets at fair value through other comprehensive income	185,139		85,069
Financial assets at fair value through other comprehensive income | Equity investments
Financial Investments Abstract [Abstract]
Financial assets at fair value through other comprehensive income	37,602		41,042
Financial assets at fair value through other comprehensive income | Privately placed bonds
Financial Investments Abstract [Abstract]
Financial assets at fair value through other comprehensive income	265,426		375,098
Financial assets at fair value through other comprehensive income | Other loans
Financial Investments Abstract [Abstract]
Financial assets at fair value through other comprehensive income	27,983		0
Financial assets at amortized cost
Financial Investments Abstract [Abstract]
Financial assets at amortized cost	36,870,229		25,346,555
Financial assets at amortized cost | Government and public bonds
Financial Investments Abstract [Abstract]
Financial assets at amortized cost	17,193,289		5,395,720
Financial assets at amortized cost | Financial bonds
Financial Investments Abstract [Abstract]
Financial assets at amortized cost	5,678,949		8,157,428
Financial assets at amortized cost | Corporate bonds
Financial Investments Abstract [Abstract]
Financial assets at amortized cost	8,181,961		7,536,805
Financial assets at amortized cost | Asset-backed securities
Financial Investments Abstract [Abstract]
Financial assets at amortized cost	5,788,587		4,258,274
Financial assets at amortized cost | Allowances for credit losses
Financial Investments Abstract [Abstract]
Financial assets at amortized cost	(2,949)		(1,672)
Financial assets at amortized cost | Other debt securities
Financial Investments Abstract [Abstract]
Financial assets at amortized cost	₩ 30,392		₩ 0

Financial Assets at Fair Valu_4

Financial Assets at Fair Value through Profit or Loss and Financial Investments_Dividend Incomes From The Equity Securities(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [Line Items]
From the financial assets derecognized	₩ 7,000	₩ 0
From the remaining financial assets	38,124	54,768
Listed
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [Line Items]
From the financial assets derecognized	7,000	0
From the remaining financial assets	11,843	26,121
Unlisted
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [Line Items]
From the financial assets derecognized	0	0
From the remaining financial assets	22,241	25,599
Equity investments
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [Line Items]
From the financial assets derecognized	0	0
From the remaining financial assets	285	95
Other equity securities
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [Line Items]
From the financial assets derecognized	0	0
From the remaining financial assets	₩ 3,755	₩ 2,953

Financial Assets at Fair Valu_5

Financial Assets at Fair Value through Profit or Loss and Financial Investments_Derecognized Equity Securities Measured At Fair Value Through Other Comprehensive Income(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [Line Items]
Disposal price	₩ 516,899	₩ 20,013
Accumulated other comprehensive income as of disposal date	326,410	(25,483)
Listed
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [Line Items]
Disposal price	516,883	18,342
Accumulated other comprehensive income as of disposal date	326,394	(25,652)
Unlisted
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [Line Items]
Disposal price	13	1,671
Accumulated other comprehensive income as of disposal date	13	169
Equity investments
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [Line Items]
Disposal price	3	0
Accumulated other comprehensive income as of disposal date	₩ 3	₩ 0

Financial Assets at Fair Valu_6

Financial Assets at Fair Value through Profit or Loss and Financial Investments_Provision And Reversal For The Allowance Of Financial Investments(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Provision And Reversal For The Allowance Of Financial Investments Line Items [Line Items]
Provision	₩ 6,415	₩ 1,923	₩ 2,119
Reversal	(1,181)	(2,406)	(1,981)
Total	5,234	(483)	138
Securities measured at fair value through other comprehensive income
Disclosure Of Provision And Reversal For The Allowance Of Financial Investments Line Items [Line Items]
Provision	4,297	1,537	860
Reversal	(229)	(1,144)	(873)
Total	4,068	393	(13)
Loans measured at fair value through other comprehensive income
Disclosure Of Provision And Reversal For The Allowance Of Financial Investments Line Items [Line Items]
Provision	202	170	963
Reversal	(316)	(982)	(826)
Total	(114)	(812)	137
Securities measured at amortized cost
Disclosure Of Provision And Reversal For The Allowance Of Financial Investments Line Items [Line Items]
Provision	1,916	216	296
Reversal	(636)	(280)	(282)
Total	₩ 1,280	₩ (64)	₩ 14

Financial Assets at Fair Valu_7

Financial Assets at Fair Value through Profit or Loss and Financial Investments_Changes In The Allowances For Credit Losses Of Financial Investments(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes In The Allowances For Credit Losses Of Financial Investments [Abstract]
Provision (reversal) for credit losses	₩ 5,234	₩ (483)	₩ 138
Financial assets at fair value through profit or loss and financial investments | 12-month expected credit losses
Disclosure Of Changes In The Allowances For Credit Losses Of Financial Investments [Line Items]
Beginning	5,370	5,657
Changes In The Allowances For Credit Losses Of Financial Investments [Abstract]
Transfer to 12-month expected credit losses	0	437
Transfer to lifetime expected credit losses	0	(669)
Sales	(589)	(329)
Provision (reversal) for credit losses	5,195	219
Others	(68)	55
Ending	9,908	5,370	5,657
Financial assets at fair value through profit or loss and financial investments | Non-impaired
Disclosure Of Changes In The Allowances For Credit Losses Of Financial Investments [Line Items]
Beginning	0	192
Changes In The Allowances For Credit Losses Of Financial Investments [Abstract]
Transfer to 12-month expected credit losses	0	(188)
Transfer to lifetime expected credit losses	0	669
Sales	0	0
Provision (reversal) for credit losses	39	(702)
Others	0	29
Ending	39	0	192
Financial assets at fair value through profit or loss and financial investments | Impaired
Disclosure Of Changes In The Allowances For Credit Losses Of Financial Investments [Line Items]
Beginning	0	322
Changes In The Allowances For Credit Losses Of Financial Investments [Abstract]
Transfer to 12-month expected credit losses	0	(249)
Transfer to lifetime expected credit losses	0	0
Sales	0	0
Provision (reversal) for credit losses	0	0
Others	73	(73)
Ending	₩ 73	₩ 0	₩ 322

Investments in Associates and_3

Investments in Associates and Joint Ventures_Investments In Associates And Joint Ventures(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)		Dec. 31, 2019KRW (₩)		Dec. 31, 2018KRW (₩)		Dec. 31, 2020USD ($)
Disclosure of associates and joint ventures [Line Items]
Acquistion cost		₩ 737,672		₩ 577,113
Share of net asset amount		757,297		584,374
Carrying amount		₩ 771,435	[1]	₩ 598,240	[1]	₩ 504,932	[1]	$ 710,274
Description Of Exemption For Equity Method		In accordance with IAS No.28 Investments in Associates and Joint Ventures, the Group has applied exemption of equity method for 28 companies including Rainist Co., Ltd., and recognized them as financial assets at fair value through profit or loss. Although the Group holds more than 20% of ownership, the entities that the Group has a limited influence on due to the trust agreement on related activities, bankruptcy and rehabilitation procedures have been excluded from the investment in associates by limited influence.
KB Pre IPO Secondary Venture Fund No.1
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)	[2]	15.19%		15.19%
Acquistion cost	[2]	₩ 551		₩ 1,137
Share of net asset amount	[2],[3]	1,279		1,705
Carrying amount	[1]	₩ 1,279	[2],[3]	₩ 1,705	[2],[3]	₩ 1,649
Industry	[2]	Investment finance		Investment finance
Location	[2]	Korea		Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies
KB GwS Private Securities Investment Trust
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)		26.74%		26.74%
Acquistion cost		₩ 113,880		₩ 113,880
Share of net asset amount	[3]	142,799		138,013
Carrying amount	[1]	₩ 141,359	[3]	₩ 136,168	[3]	₩ 134,362
Industry		Investment finance		Investment finance
Location		Korea		Korea
KB Star Office Private Real Estate Investment Trust No.1
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)		21.05%		21.05%
Acquistion cost		₩ 20,000		₩ 20,000
Share of net asset amount	[3]	20,413		19,839
Carrying amount	[1]	₩ 20,066	[3]	₩ 19,839	[3]	₩ 19,839
Industry		Investment finance		Investment finance
Location		Korea		Korea
PT Bank Bukopin TBK
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)				22.00%
Acquistion cost				₩ 116,422
Share of net asset amount	[3]			115,321
Carrying amount	[1],[4]	₩ 0	[3]	₩ 121,381	[3]	₩ 113,932
Industry				Banking and foreign exchange transaction
Location				Indonesia
Balhae Infrastructure Company
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)	[2]	12.61%		12.61%
Acquistion cost	[2]	₩ 106,107		₩ 105,214
Share of net asset amount	[2],[3]	106,624		101,391
Carrying amount	[1]	₩ 106,624	[2],[3]	₩ 101,391	[2],[3]	₩ 108,050
Industry	[2]	Investment finance		Investment finance
Location	[2]	Korea		Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies
Aju Good Technology Venture Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)		38.46%		38.46%
Acquistion cost		₩ 17,113		₩ 19,998
Share of net asset amount	[3]	21,351		23,016
Carrying amount	[1]	₩ 21,348	[3]	₩ 23,016	[3]	₩ 18,134
Industry		Investment finance		Investment finance
Location		Korea		Korea
SY Auto Capital Co., Ltd.
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)		49.00%		49.00%
Acquistion cost		₩ 9,800		₩ 9,800
Share of net asset amount	[3]	18,713		17,736
Carrying amount	[1]	₩ 16,144	[3]	₩ 12,725	[3]	₩ 10,672
Industry		Installment loan		Installment loan
Location		Korea		Korea
Incheon Bridge Co., Ltd.
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates
Ownership (%)	[2]	14.99%		14.99%
Acquistion cost	[2]	₩ 9,158		₩ 9,158
Share of net asset amount	[2],[3]	(18,100)		₩ (14,746)
Carrying amount	[1],[2],[3]	₩ 0
Industry	[2]	Operation of highways and related facilities		Operation of highways and related facilities
Location	[2]	Korea		Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies
Big Dipper Co., Ltd.
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)		25.14%		29.33%
Acquistion cost		₩ 440		₩ 440
Share of net asset amount	[3]	(5)		10
Carrying amount	[1]	₩ 0	[3]	₩ 125	[3]	₩ 280
Industry		Research, consulting and big data		Research, consulting and big data
Location		Korea		Korea
APRO Co., Ltd.
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship				Associates		Associates
Ownership (%)	[2]			15.19%
Acquistion cost	[2]			₩ 1,500
Share of net asset amount	[2],[3]			2,565
Carrying amount	[1]			₩ 2,790	[2],[3]	₩ 1,403
Industry	[2]			Manufacture of electric power storage system
Location	[2]			Korea
Description of nature of entitys relationship with associate				As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies
Paycoms Co., Ltd.
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)	[5]	11.70%		11.70%
Acquistion cost	[5]	₩ 800		₩ 800
Share of net asset amount	[3],[5]	72		17
Carrying amount	[1]	₩ 198	[3],[5]	₩ 45	[3],[5]	₩ 103
Industry	[5]	System software publishing		System software publishing
Location	[5]	Korea		Korea
Description of nature of entitys relationship with associate		The ownership of Paycoms Co., Ltd. would be 22.96% and 22.96% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond.		The ownership of Paycoms Co., Ltd. would be 22.96% and 22.96% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond.
Food Factory Co., Ltd.
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)	[6]	22.22%		22.22%
Acquistion cost	[6]	₩ 1,000		₩ 1,000
Share of net asset amount	[3],[6]	632		398
Carrying amount	[1]	₩ 1,281	[3],[6]	₩ 1,000	[3],[6]	₩ 928
Industry	[6]	Farm product distribution industry		Farm product distribution industry
Location	[6]	Korea		Korea
Description of nature of entitys relationship with associate		The ownership of Food Factory Co., Ltd. would be 30.00% and 30.00% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond.		The ownership of Food Factory Co., Ltd. would be 30.00% and 30.00% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond.
KB Private Equity Fund No.3
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)	[2]	15.69%		15.69%
Acquistion cost	[2]	₩ 0		₩ 8,000
Share of net asset amount	[2],[3]	94		7,754
Carrying amount	[1]	₩ 94	[2],[3]	₩ 7,754	[2],[3]	₩ 7,830
Industry	[2]	Investment finance		Investment finance
Location	[2]	Korea		Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies
Korea Credit Bureau Co., Ltd.
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)	[2]	9.00%		9.00%
Acquistion cost	[2]	₩ 4,500		₩ 4,500
Share of net asset amount	[2],[3]	7,153		5,991
Carrying amount	[1]	₩ 7,153	[2],[3]	₩ 5,991	[2],[3]	₩ 5,941
Industry	[2]	Credit information		Credit information
Location	[2]	Korea		Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies
KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No. 2
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)		25.00%		25.00%
Acquistion cost		₩ 9,739		₩ 12,970
Share of net asset amount	[3]	9,845		13,616
Carrying amount	[1]	₩ 9,845	[3]	₩ 13,616	[3]	₩ 14,601
Industry		Investment finance		Investment finance
Location		Korea		Korea
Keystone-Hyundai Securities No. 1 Private Equity Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)	[2]	4.49%		4.49%
Acquistion cost	[2]	₩ 1,908		₩ 1,908
Share of net asset amount	[2],[3]	1,556		1,625
Carrying amount	[1]	₩ 1,556	[2],[3]	₩ 1,625	[2],[3]	₩ 1,581
Industry	[2]	Investment finance		Investment finance
Location	[2]	Korea		Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.
POSCO-KB Shipbuilding Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)		31.25%		31.25%
Acquistion cost		₩ 10,375		₩ 7,500
Share of net asset amount	[3]	12,895		6,847
Carrying amount	[1]	₩ 12,895	[3]	₩ 6,847	[3]	₩ 4,463
Industry		Investment finance		Investment finance
Location		Korea		Korea
GH Real Estate I LP
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship				Associates		Associates
Ownership (%)				42.00%
Acquistion cost				₩ 17,678
Share of net asset amount	[3]			19,042
Carrying amount	[1]			₩ 19,042	[3]	₩ 17,252
Industry				Asset management
Location				Guernsey
UNION Media Commerce Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)		28.99%		28.99%
Acquistion cost		₩ 1,000		₩ 1,000
Share of net asset amount	[3]	960		961
Carrying amount	[1]	₩ 960	[3]	₩ 961	[3]	₩ 962
Industry		Investment		Investment
Location		Korea		Korea
KB Social Impact Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates
Ownership (%)		30.00%		30.00%
Acquistion cost		₩ 3,000		₩ 1,500
Share of net asset amount	[3]	2,874		1,465
Carrying amount	[1],[3]	₩ 2,874		₩ 1,465
Industry		Investment finance		Investment finance
Location		Korea		Korea
KB-Solidus Global Healthcare Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates
Ownership (%)		43.33%		43.33%
Acquistion cost		₩ 48,677		₩ 42,697
Share of net asset amount	[3]	45,516		45,021
Carrying amount	[1],[3]	₩ 46,213		₩ 45,718
Industry		Investment finance		Investment finance
Location		Korea		Korea
KB-Stonebridge Secondary Private Equity Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates
Ownership (%)	[2]	14.56%		14.56%
Acquistion cost	[2]	₩ 14,308		₩ 5,215
Share of net asset amount	[2],[3]	16,636		4,944
Carrying amount	[1],[2],[3]	₩ 16,636		₩ 4,944
Industry	[2]	Investment finance		Investment finance
Location	[2]	Korea		Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.
KB SPROTT Renewable Private Equity Fund No.1
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates
Ownership (%)		37.69%		37.69%
Acquistion cost		₩ 5,795		₩ 1,667
Share of net asset amount	[3]	5,049		1,295
Carrying amount	[1],[3]	₩ 5,049		₩ 1,295
Industry		Investment finance		Investment finance
Location		Korea		Korea
KB-UTC Inno-Tech Venture Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates
Ownership (%)		44.29%		44.29%
Acquistion cost		₩ 17,416		₩ 450
Share of net asset amount	[3]	16,999		417
Carrying amount	[1],[3]	₩ 16,999		₩ 417
Industry		Investment finance		Investment finance
Location		Korea		Korea
KB-KDBC Pre-IPO New Technology Business Investment Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Joint ventures		Joint ventures		Joint ventures
Ownership (%)	[7]	66.66%		66.66%
Acquistion cost	[7]	₩ 13,601		₩ 20,000
Share of net asset amount	[3],[7]	16,042		18,988
Carrying amount	[1]	₩ 16,042	[3],[7]	₩ 18,988	[3],[7]	₩ 14,594
Industry	[7]	Investment finance		Investment finance
Location	[7]	Korea		Korea
Description of nature of entity's relationship with joint venture		In order to direct relevant activities, it is necessary to obtain the consent of the two co-operative members; the Group has applied the equity method as the Group cannot control the investee by itself.		In order to direct relevant activities, it is necessary to obtain the consent of the two co-operative members; the Group has applied the equity method as the Group cannot control the investee by itself.
KB-TS Technology Venture Private Equity Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Joint ventures		Joint ventures		Joint ventures
Ownership (%)	[7]	56.00%		56.00%
Acquistion cost	[7]	₩ 16,576		₩ 19,824
Share of net asset amount	[3],[7]	17,630		19,731
Carrying amount	[1]	₩ 17,630	[3],[7]	₩ 19,731	[3],[7]	₩ 13,777
Industry	[7]	Investment finance		Investment finance
Location	[7]	Korea		Korea
Description of nature of entity's relationship with joint venture		In order to direct relevant activities, it is necessary to obtain the consent of the two co-operative members; the Group has applied the equity method as the Group cannot control the investee by itself.		In order to direct relevant activities, it is necessary to obtain the consent of the two co-operative members; the Group has applied the equity method as the Group cannot control the investee by itself.
KB-Brain KOSDAQ Scale-up New Technology Business Investment Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Joint ventures		Joint ventures		Joint ventures
Ownership (%)	[7]	42.55%		42.55%
Acquistion cost	[7]	₩ 26,050		₩ 21,250
Share of net asset amount	[7]	27,513		20,504	[3]
Carrying amount	[1]	₩ 26,763	[7]	₩ 19,752	[3],[7]	₩ 7,930
Industry	[7]	Investment finance		Investment finance
Location	[7]	Korea		Korea
Description of nature of entity's relationship with joint venture		In order to direct relevant activities, it is necessary to obtain the consent of the two co-operative members; the Group has applied the equity method as the Group cannot control the investee by itself.		In order to direct relevant activities, it is necessary to obtain the consent of the two co-operative members; the Group has applied the equity method as the Group cannot control the investee by itself.
KB-SJ Tourism Venture Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Ownership (%)	[2]	18.52%		18.52%
Acquistion cost	[2]	₩ 4,500		₩ 3,000
Share of net asset amount	[2],[3]	4,133		2,761
Carrying amount	[1]	₩ 4,133	[2],[3]	₩ 2,761	[2],[3]	₩ 1,386
Industry	[2]	Investment finance		Investment finance
Location	[2]	Korea		Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.
KBSP Private Equity Fund No.4
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates		Associates
Ownership (%)	[2]	14.95%		14.95%
Acquistion cost	[2]	₩ 6,100		₩ 6,100
Share of net asset amount	[2],[3]	5,950		5,904
Carrying amount	[1],[2],[3]	₩ 5,950		₩ 5,904
Industry	[2]	Investment finance		Investment finance
Location	[2]	Korea		Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.
WJ Private Equity Fund No.1
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates
Ownership (%)		26.95%
Acquistion cost		₩ 10,000
Share of net asset amount	[3]	9,711
Carrying amount	[1],[3]	₩ 9,711
Industry		Investment finance
Location		Korea
All Together Korea Fund No.2
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates
Ownership (%)		99.99%
Acquistion cost		₩ 10,000
Share of net asset amount	[3]	10,023
Carrying amount	[1],[3]	₩ 10,023
Industry		Asset management
Location		Korea
KB-NAU Special Situation Corporate Restructuring Private Equity Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates
Ownership (%)	[2]	12.00%
Acquistion cost	[2]	₩ 5,700
Share of net asset amount	[2],[3]	5,611
Carrying amount	[1],[2],[3]	₩ 5,611
Industry	[2]	Asset management
Location	[2]	Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.
JR GLOBAL REIT
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates
Ownership (%)		26.07%
Acquistion cost		₩ 215,854
Share of net asset amount	[3]	215,854
Carrying amount	[1],[3]	₩ 215,854
Industry		Real estate management
Location		Korea
Project Vanilla Co., Ltd.
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates
Ownership (%)		49.00%
Acquistion cost		₩ 2,450
Share of net asset amount	[3]	2,151
Carrying amount	[1],[3]	₩ 2,151
Industry		System software publishing
Location		Korea
December & Company Inc.
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates
Ownership (%)	[2]	17.63%
Acquistion cost	[2]	₩ 24,849
Share of net asset amount	[2],[3]	24,402
Carrying amount	[1],[2],[3]	₩ 24,402
Industry	[2]	System software publishing
Location	[2]	Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.
2020 KB Fintech Renaissance Fund
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates
Ownership (%)	[2]	5.05%
Acquistion cost	[2]	₩ 550
Share of net asset amount	[2],[3]	547
Carrying amount	[1],[2],[3]	₩ 547
Industry	[2]	Investment finance
Location	[2]	Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.
KB Material and Parts No.1 PEF
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates
Ownership (%)	[2]	14.47%
Acquistion cost	[2]	₩ 3,400
Share of net asset amount	[2],[3]	3,371
Carrying amount	[1],[2],[3]	₩ 3,371
Industry	[2]	Investment finance
Location	[2]	Korea
Description of nature of entitys relationship with associate		As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.
FineKB Private Equity Fund No.1
Disclosure of associates and joint ventures [Line Items]
Description of nature of related party relationship		Associates
Ownership (%)		25.00%
Acquistion cost		₩ 0
Share of net asset amount	[3]	0
Carrying amount	[1],[3]	₩ 0
Industry		Investment finance
Location		Korea
Others
Disclosure of associates and joint ventures [Line Items]
Acquistion cost		₩ 2,475		₩ 2,505
Share of net asset amount		₩ 1,004		2,243
Carrying amount	[1]			₩ 1,244		₩ 5,263
[1]	Gains on disposal of investments in associates and joint ventures amount to KRW 1,423 million KRW 24,768 million for the years ended December 31, 2019 and 2020, respectively.
[2]	As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.
[3]	The condensed financial information of the associates and joint ventures is adjusted to reflect adjustments made by the Group, such as fair value adjustments made at the time of acquisition and adjustments for differences in accounting policies.
[4]	The investment was reclassified to subsidiaries from associates for the year ended December 31, 2020 due to additional share purchase.
[5]	The ownership of Paycoms Co., Ltd. would be 22.96% and 22.96% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond.
[6]	The ownership of Food Factory Co., Ltd. would be 30.00% and 30.00% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond.
[7]	In order to direct relevant activities, it is necessary to obtain the consent of the two co-operative members; the Group has applied the equity method as the Group cannot control the investee by itself.

Investments in Associates and_4

Investments in Associates and Joint Ventures_Summarized Financial Information On Major Associates And Joint Ventures Adjustments To Carrying Amount Of Investment In Associates And Dividends Received(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)		Dec. 31, 2019KRW (₩)		Dec. 31, 2018KRW (₩)		Dec. 31, 2020USD ($)
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Share of net asset amount		₩ 757,297		₩ 584,374
Carrying amount		771,435	[1]	598,240	[1]	₩ 504,932	[1]	$ 710,274
Dividends	[1]	₩ 18,669		₩ 16,287
Description Of Basis Of Preparation Of Summarised Financial Information Of Associate		The condensed financial information of the associates and joint ventures is adjusted to reflect adjustments made by the Group, such as fair value adjustments made at the time of acquisition and adjustments for differences in accounting policies.		The condensed financial information of the associates and joint ventures is adjusted to reflect adjustments made by the Group, such as fair value adjustments made at the time of acquisition and adjustments for differences in accounting policies.
Description of basis of preparation of summarised financial information of associate		The condensed financial information of the associates and joint ventures is adjusted to reflect adjustments made by the Group, such as fair value adjustments made at the time of acquisition and adjustments for differences in accounting policies.		The condensed financial information of the associates and joint ventures is adjusted to reflect adjustments made by the Group, such as fair value adjustments made at the time of acquisition and adjustments for differences in accounting policies.
KB Pre IPO Secondary Venture Fund No.1
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 8,423		₩ 11,237
Total liabilities	[2]	3		20
Share capital	[2]	5,940		8,690
Equity	[2]	8,420		11,217
Share of net asset amount	[2],[3]	1,279		1,705
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1]	1,279	[2],[3]	1,705	[2],[3]	₩ 1,649
Operating income	[2]	1,942		3,225
Profit (Loss)	[2]	1,053		2,452
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	1,053		2,452
Dividends	[1],[2]	₩ 0		₩ 0
KB GwS Private Securities Investment Trust
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 534,764		₩ 522,865
Total liabilities	[2]	741		741
Share capital	[2]	425,814		425,814
Equity		534,023	[2]	522,124
Share of net asset amount	[2]	142,799		138,013
Unrealized gains (losses)	[2]	(1,440)		(1,845)
Carrying amount	[1]	141,359	[2]	136,168	[2]	₩ 134,362
Operating income	[2]	48,501		42,503
Profit (Loss)	[2]	47,520		41,524
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	47,520		41,524
Dividends	[1],[2]	₩ 9,525		₩ 9,297
KB Star Office Private Real Estate Investment Trust No.1
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 231,018		₩ 218,611
Total liabilities	[2]	122,298		122,465
Share capital	[2]	95,000		95,000
Equity	[2]	108,720		96,146
Share of net asset amount	[2]	20,413		19,839
Unrealized gains (losses)	[2]	(347)		0
Carrying amount	[1]	20,066	[2]	19,839	[2]	₩ 19,839
Operating income	[2]	2,392		14,455
Profit (Loss)	[2]	1,076		6,004
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	1,076		6,004
Dividends	[1],[2]	₩ 0		₩ 0
PT Bank Bukopin TBK
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]			₩ 8,148,013
Total liabilities	[2]			7,623,829
Share capital	[2]			106,536
Equity	[2]			524,184
Share of net asset amount	[2]			115,321
Unrealized gains (losses)	[2]			6,060
Carrying amount	[1],[4]	₩ 0	[2]	121,381	[2]	₩ 113,932
Operating income	[2]			721,169
Profit (Loss)	[2]			(5,612)
Other comprehensive income	[2]			45,780
Total comprehensive income	[2]			40,168
Dividends	[1],[2],[4]	₩ 0		₩ 0
Balhae Infrastructure Company
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 847,758		₩ 806,218
Total liabilities	[2]	1,870		1,854
Share capital	[2]	841,784		834,695
Equity	[2]	845,888		804,364
Share of net asset amount	[2],[3]	106,624		101,391
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1]	106,624	[2],[3]	101,391	[2],[3]	₩ 108,050
Operating income	[2]	63,781		62,113
Profit (Loss)	[2]	89,757		(3,153)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	89,757		(3,153)
Dividends	[1],[2]	₩ 6,973		₩ 6,855
Aju Good Technology Venture Fund
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 57,776		₩ 60,675
Total liabilities	[2]	2,265		828
Share capital	[2]	44,500		52,000
Equity	[2]	55,511		59,847
Share of net asset amount	[2]	21,351		23,016
Unrealized gains (losses)	[2]	(3)		0
Carrying amount	[1]	21,348	[2]	23,016	[2]	₩ 18,134
Operating income	[2]	8,685		9,288
Profit (Loss)	[2]	2,815		7,734
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	2,815		7,734
Dividends	[1],[2]	₩ 0		₩ 0
SY Auto Capital Co., Ltd.
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 89,462		₩ 88,611
Total liabilities	[2]	51,272		52,415
Share capital	[2]	20,000		20,000
Equity	[2]	38,190		36,196
Share of net asset amount	[2]	18,713		17,736
Unrealized gains (losses)	[2]	(2,569)		(5,011)
Carrying amount	[1]	16,144	[2]	12,725	[2]	₩ 10,672
Operating income	[2]	17,404		20,394
Profit (Loss)	[2]	2,057		5,292
Other comprehensive income	[2]	(49)		(215)
Total comprehensive income	[2]	2,008		5,077
Dividends	[1],[2]	₩ 0		₩ 0
Incheon Bridge Co., Ltd.
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates
Total assets	[2]	₩ 579,386		₩ 609,194
Total liabilities	[2]	700,133		707,563
Share capital	[2]	61,096		61,096
Equity	[2]	(120,747)		(98,369)
Share of net asset amount	[2],[3]	(18,100)		(14,746)
Unrealized gains (losses)	[2]	18,100		14,746
Carrying amount	[1],[2],[3]	0
Operating income		70,345	[2]	107,178
Profit (Loss)	[2]	(23,200)		9,127
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	(23,200)		₩ 9,127
Dividends	[1],[2]	₩ 0
Big Dipper Co., Ltd.
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 285		₩ 370
Total liabilities	[2]	306		336
Share capital	[2]	1,750		1,500
Equity	[2]	(21)		34
Share of net asset amount	[2]	(5)		10
Unrealized gains (losses)	[2]	5		115
Carrying amount	[1]	0	[2]	125	[2]	₩ 280
Operating income	[2]	942		598
Profit (Loss)	[2]	(305)		(532)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	(305)		(532)
Dividends	[1],[2]	₩ 0		₩ 0
APRO Co., Ltd.
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship				Associates		Associates
Total assets	[2]			₩ 47,164
Total liabilities	[2]			30,281
Share capital	[2]			2,468
Equity	[2]			16,883
Share of net asset amount	[2],[3]			2,565
Unrealized gains (losses)	[2]			225
Carrying amount	[1]			2,790	[2],[3]	₩ 1,403
Operating income	[2]			47,725
Profit (Loss)	[2]			7,702
Other comprehensive income	[2]			0
Total comprehensive income	[2]			7,702
Dividends	[1],[2]			₩ 0
Paycoms Co., Ltd.
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 2,690		₩ 1,763
Total liabilities	[2]	2,073		1,620
Share capital	[2]	855		855
Equity	[2]	617		143
Share of net asset amount	[2],[5]	72		17
Unrealized gains (losses)	[2]	126		28
Carrying amount	[1]	198	[2],[5]	45	[2],[5]	₩ 103
Operating income	[2]	1,391		262
Profit (Loss)	[2]	505		(343)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	505		(343)
Dividends	[1],[2]	₩ 0		₩ 0
Food Factory Co., Ltd.
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 7,613		₩ 5,587
Total liabilities	[2]	4,767		3,797
Share capital	[2]	450		450
Equity	[2]	2,846		1,790
Share of net asset amount	[2],[6]	632		398
Unrealized gains (losses)	[2]	649		602
Carrying amount	[1]	1,281	[2],[6]	1,000	[2],[6]	₩ 928
Operating income	[2]	9,282		6,807
Profit (Loss)	[2]	407		664
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	407		664
Dividends	[1],[2]	₩ 0		₩ 0
KB Private Equity Fund No.3
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 1,132		₩ 49,437
Total liabilities	[2]	533		4
Share capital	[2]	0		51,000
Equity	[2]	599		49,433
Share of net asset amount	[2],[3]	94		7,754
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1]	94	[2],[3]	7,754	[2],[3]	₩ 7,830
Operating income	[2]	0		0
Profit (Loss)	[2]	15,442		(485)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	15,442		(485)
Dividends	[1],[2]	₩ 2,082		₩ 0
Korea Credit Bureau Co., Ltd.
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 117,077		₩ 96,855
Total liabilities	[2]	37,599		30,289
Share capital	[2]	10,000		10,000
Equity	[2]	79,478		66,566
Share of net asset amount	[2],[3]	7,153		5,991
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1]	7,153	[2],[3]	5,991	[2],[3]	₩ 5,941
Operating income	[2]	107,810		91,200
Profit (Loss)	[2]	13,391		1,480
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	13,391		1,480
Dividends	[1],[2]	₩ 89		₩ 135
KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No. 2
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 42,585		₩ 55,524
Total liabilities	[2]	3,205		1,063
Share capital	[2]	38,960		51,880
Equity	[2]	39,380		54,461
Share of net asset amount	[2]	9,845		13,616
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1]	9,845	[2]	13,616	[2]	₩ 14,601
Operating income	[2]	1,629		4,077
Profit (Loss)	[2]	626		(3,911)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	626		(3,911)
Dividends	[1],[2]	₩ 0		₩ 0
Keystone-Hyundai Securities No. 1 Private Equity Fund
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 178,848		₩ 187,156
Total liabilities	[2]	132,123		153,842
Share capital	[2]	42,837		42,837
Equity	[2]	46,725		33,314
Share of net asset amount	[2],[3]	1,556		1,625
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1]	1,556	[2],[3]	1,625	[2],[3]	₩ 1,581
Operating income	[2]	16,586		18,342
Profit (Loss)	[2]	(1,536)		(572)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	(1,536)		(572)
Dividends	[1],[2]	₩ 0		₩ 0
POSCO-KB Shipbuilding Fund
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 41,807		₩ 21,916
Total liabilities	[2]	541		4
Share capital	[2]	33,200		24,000
Equity	[2]	41,266		21,912
Share of net asset amount	[2]	12,895		6,847
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1]	12,895	[2]	6,847	[2]	₩ 4,463
Operating income	[2]	12,842		1,000
Profit (Loss)	[2]	10,154		(371)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	10,154		(371)
Dividends	[1],[2]	₩ 0		₩ 0
GH Real Estate I LP
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship				Associates		Associates
Total assets	[2]			₩ 45,340
Total liabilities	[2]			61
Share capital	[2]			42,093
Equity	[2]			45,279
Share of net asset amount	[2]			19,042
Unrealized gains (losses)	[2]			0
Carrying amount	[1]			19,042	[2]	₩ 17,252
Operating income	[2]			5,043
Profit (Loss)	[2]			3,698
Other comprehensive income	[2]			565
Total comprehensive income	[2]			4,263
Dividends	[1],[2]			₩ 0
UNION Media Commerce Fund
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 3,318		₩ 3,318
Total liabilities	[2]	7		4
Share capital	[2]	3,450		3,450
Equity	[2]	3,311		3,314
Share of net asset amount	[2]	960		961
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1]	960	[2]	961	[2]	₩ 962
Operating income	[2]	0		0
Profit (Loss)	[2]	(3)		(3)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	(3)		(3)
Dividends	[1],[2]	₩ 0		₩ 0
KBSP Private Equity Fund No.4
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates
Total assets	[2]	₩ 39,795		₩ 39,492
Total liabilities	[2]	0		2
Share capital	[2]	40,800		40,800
Equity	[2]	39,795		39,490
Share of net asset amount	[2],[3]	5,950		5,904
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1],[2],[3]	5,950		5,904
Operating income	[2]	2		39
Profit (Loss)	[2]	306		(1,304)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	306		(1,304)
Dividends	[1],[2]	₩ 0		₩ 0
KB Social Impact Fund
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates
Total assets	[2]	₩ 9,585		₩ 4,885
Total liabilities	[2]	4		3
Share capital	[2]	10,000		5,000
Equity	[2]	9,581		4,882
Share of net asset amount	[2]	2,874		1,465
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1],[2]	2,874		1,465
Operating income	[2]	8		8
Profit (Loss)	[2]	(301)		(118)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	(301)		(118)
Dividends	[1],[2]	₩ 0		₩ 0
KB-Solidus Global Healthcare Fund
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates
Total assets	[2]	₩ 106,215		₩ 103,896
Total liabilities	[2]	1,179		5
Share capital	[2]	75,600		61,800
Equity	[2]	105,036		103,891
Share of net asset amount	[2]	45,516		45,021
Unrealized gains (losses)	[2]	697		697
Carrying amount	[1],[2]	46,213		45,718
Operating income	[2]	6,435		13,085
Profit (Loss)	[2]	(12,655)		8,708
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	(12,655)		8,708
Dividends	[1],[2]	₩ 0		₩ 0
KB-Stonebridge Secondary Private Equity Fund
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates
Total assets	[2]	₩ 114,712		₩ 34,450
Total liabilities	[2]	496		507
Share capital	[2]	98,235		35,805
Equity	[2]	114,216		33,943
Share of net asset amount	[2],[3]	16,636		4,944
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1],[2],[3]	16,636		4,944
Operating income	[2]	20,068		346
Profit (Loss)	[2]	17,842		(1,856)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	17,842		(1,856)
Dividends	[1],[2]	₩ 0		₩ 0
KB SPROTT Renewable Private Equity Fund No.1
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates
Total assets	[2]	₩ 13,896		₩ 3,686
Total liabilities	[2]	497		249
Share capital	[2]	15,376		9,640
Equity	[2]	13,399		3,437
Share of net asset amount	[2]	5,049		1,295
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1],[2]	5,049		1,295
Operating income	[2]	1		1
Profit (Loss)	[2]	(991)		(986)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	(991)		(986)
Dividends	[1],[2]	₩ 0		₩ 0
KB-UTC Inno-Tech Venture Fund
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates
Total assets	[2]	₩ 38,585		₩ 1,016
Total liabilities	[2]	207		75
Share capital	[2]	39,319		1,016
Equity	[2]	38,378		941
Share of net asset amount	[2]	16,999		417
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1],[2]	16,999		417
Operating income	[2]	0		0
Profit (Loss)	[2]	(866)		(75)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	(866)		(75)
Dividends	[1],[2]	₩ 0		₩ 0
KB-KDBC Pre-IPO New Technology Business Investment Fund [Member]
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Joint ventures		Joint ventures		Joint ventures
Total assets	[2]	₩ 24,655		₩ 29,086
Total liabilities	[2]	592		603
Share capital	[2]	20,400		30,000
Equity	[2]	24,063		28,483
Share of net asset amount	[2],[7]	16,042		18,988
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1]	16,042	[2],[7]	18,988	[2],[7]	₩ 14,594
Operating income	[2]	5,151		371
Profit (Loss)	[2]	4,421		(638)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	4,421		(638)
Dividends	[1],[2]	₩ 0		₩ 0
KB-TS Technology Venture Private Equity Fund [Member]
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Joint ventures		Joint ventures		Joint ventures
Total assets	[2]	₩ 34,972		₩ 36,445
Total liabilities	[2]	3,490		1,212
Share capital	[2]	29,600		35,400
Equity	[2]	31,482		35,233
Share of net asset amount	[2],[7]	17,630		19,731
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1]	17,630	[2],[7]	19,731	[2],[7]	₩ 13,777
Operating income	[2]	5,342		1,643
Profit (Loss)	[2]	4,051		632
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	4,051		632
Dividends	[1],[2]	₩ 0		₩ 0
KB-Brain KOSDAQ Scale-up New Technology Business Investment Fund [Member]
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Joint ventures		Joint ventures		Joint ventures
Total assets		₩ 64,968		₩ 48,369	[2]
Total liabilities		313		185	[2]
Share capital		62,980		51,700	[2]
Equity		64,655		48,184	[2]
Share of net asset amount	[7]	27,513		20,504	[2]
Unrealized gains (losses)	[2]	(750)		(752)
Carrying amount	[1]	26,763	[7]	19,752	[2],[7]	₩ 7,930
Operating income	[2]	5,257		138
Profit (Loss)	[2]	3,013		(3,355)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	3,013		(3,355)
Dividends	[1],[2]	₩ 0		₩ 0
KB-SJ Tourism Venture Fund
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates		Associates		Associates
Total assets	[2]	₩ 22,327		₩ 14,914
Total liabilities	[2]	6		4
Share capital	[2]	24,300		16,200
Equity	[2]	22,321		14,910
Share of net asset amount	[2],[3]	4,133		2,761
Unrealized gains (losses)	[2]	0		0
Carrying amount	[1]	4,133	[2],[3]	2,761	[2],[3]	₩ 1,386
Operating income	[2]	0		0
Profit (Loss)	[2]	(689)		(673)
Other comprehensive income	[2]	0		0
Total comprehensive income	[2]	(689)		(673)
Dividends	[1],[2]	₩ 0		₩ 0
WJ Private Equity Fund No.1
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates
Total assets	[2]	₩ 36,197
Total liabilities	[2]	170
Share capital	[2]	37,100
Equity	[2]	36,027
Share of net asset amount	[2]	9,711
Unrealized gains (losses)	[2]	0
Carrying amount	[1],[2]	9,711
Operating income	[2]	2
Profit (Loss)	[2]	(1,073)
Other comprehensive income	[2]	0
Total comprehensive income	[2]	(1,073)
Dividends	[1],[2]	₩ 0
All Together Korea Fund No.2
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates
Total assets	[2]	₩ 10,025
Total liabilities	[2]	1
Share capital	[2]	10,001
Equity	[2]	10,024
Share of net asset amount	[2]	10,023
Unrealized gains (losses)	[2]	0
Carrying amount	[1],[2]	10,023
Operating income	[2]	187
Profit (Loss)	[2]	150
Other comprehensive income	[2]	0
Total comprehensive income	[2]	150
Dividends	[1],[2]	₩ 0
KB-NAU Special Situation Corporate Restructuring Private Equity Fund
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates
Total assets	[2]	₩ 47,607
Total liabilities	[2]	850
Share capital	[2]	47,500
Equity	[2]	46,757
Share of net asset amount	[2],[3]	5,611
Unrealized gains (losses)	[2]	0
Carrying amount	[1],[2],[3]	5,611
Operating income	[2]	2,901
Profit (Loss)	[2]	(743)
Other comprehensive income	[2]	0
Total comprehensive income	[2]	(743)
Dividends	[1],[2]	₩ 0
JR GLOBAL REIT
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates
Total assets	[2]	₩ 1,859,214
Total liabilities	[2]	1,043,068
Share capital	[2]	165,600
Equity	[2]	816,146
Share of net asset amount	[2]	215,854
Unrealized gains (losses)	[2]	0
Carrying amount	[1],[2]	215,854
Operating income	[2]	0
Profit (Loss)	[2]	0
Other comprehensive income	[2]	0
Total comprehensive income	[2]	0
Dividends	[1],[2]	₩ 0
Project Vanilla Co., Ltd.
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates
Total assets	[2]	₩ 4,445
Total liabilities	[2]	132
Share capital	[2]	5,000
Equity	[2]	4,313
Share of net asset amount	[2]	2,151
Unrealized gains (losses)	[2]	0
Carrying amount	[1],[2]	2,151
Operating income	[2]	0
Profit (Loss)	[2]	(611)
Other comprehensive income	[2]	0
Total comprehensive income	[2]	(611)
Dividends	[1],[2]	₩ 0
December & Company Inc.
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates
Total assets	[2]	₩ 68,173
Total liabilities	[2]	3,305
Share capital	[2]	35,441
Equity	[2]	64,868
Share of net asset amount	[2],[3]	24,402
Unrealized gains (losses)	[2]	0
Carrying amount	[1],[2],[3]	24,402
Operating income	[2]	756
Profit (Loss)	[2]	(2,469)
Other comprehensive income	[2]	0
Total comprehensive income	[2]	(2,469)
Dividends	[1],[2]	₩ 0
2020 KB Fintech Renaissance Fund
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates
Total assets	[2]	₩ 10,841
Total liabilities	[2]	5
Share capital	[2]	10,900
Equity	[2]	10,836
Share of net asset amount	[2],[3]	547
Unrealized gains (losses)	[2]	0
Carrying amount	[1],[2],[3]	547
Operating income	[2]	1
Profit (Loss)	[2]	(64)
Other comprehensive income	[2]	0
Total comprehensive income	[2]	(64)
Dividends	[1],[2]	₩ 0
KB Material and Parts No.1 PEF
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates
Total assets	[2]	₩ 23,296
Total liabilities	[2]	0
Share capital	[2]	23,500
Equity	[2]	23,296
Share of net asset amount	[2],[3]	3,371
Unrealized gains (losses)	[2]	0
Carrying amount	[1],[2],[3]	3,371
Operating income	[2]	0
Profit (Loss)	[2]	(204)
Other comprehensive income	[2]	0
Total comprehensive income	[2]	(204)
Dividends	[1],[2]	₩ 0
FineKB Private Equity Fund No.1
Disclosure of significant investments in major associates and joint ventures line items [Line Items]
Description of nature of related party relationship		Associates
Total assets	[2]	₩ 0
Total liabilities	[2]	77
Share capital	[2]	0
Equity	[2]	(77)
Share of net asset amount	[2]	0
Unrealized gains (losses)	[2]	0
Carrying amount	[1],[2]	0
Operating income	[2]	0
Profit (Loss)	[2]	(77)
Other comprehensive income	[2]	0
Total comprehensive income	[2]	(77)
Dividends	[1],[2]	₩ 0
[1]	Gains on disposal of investments in associates and joint ventures amount to KRW 1,423 million KRW 24,768 million for the years ended December 31, 2019 and 2020, respectively.
[2]	The condensed financial information of the associates and joint ventures is adjusted to reflect adjustments made by the Group, such as fair value adjustments made at the time of acquisition and adjustments for differences in accounting policies.
[3]	As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.
[4]	The investment was reclassified to subsidiaries from associates for the year ended December 31, 2020 due to additional share purchase.
[5]	The ownership of Paycoms Co., Ltd. would be 22.96% and 22.96% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond.
[6]	The ownership of Food Factory Co., Ltd. would be 30.00% and 30.00% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond.
[7]	In order to direct relevant activities, it is necessary to obtain the consent of the two co-operative members; the Group has applied the equity method as the Group cannot control the investee by itself.

Investments in Associates and_5

Investments in Associates and Joint Ventures_Changes In Investments In Associates And Joint Ventures(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)		Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)		Dec. 31, 2018KRW (₩)
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Beginning	[1]	₩ 598,240			₩ 504,932
Acquisition and others	[1]	515,742			92,200
Disposal and others	[1]	(251,575)			(8,475)
Dividends	[1]	(18,669)			(16,287)
Gains(losses) on equity-method accounting	[1]	(68,518)			17,594
Other comprehensive income	[1]	(3,785)			10,842
Impairment loss	[1]				(2,566)
Ending		₩ 771,435	[1]	$ 710,274	598,240	[1]	₩ 504,932	[1]
Gain on disposal of investments in associates and joint ventures					₩ 1,423
Description Of Other Changes In Investments In Associates					Gain on disposal of investments in associates and joint ventures for the year ended December 31, 2019 is KRW 1,423 million.
KB Pre IPO Secondary Venture Fund No.1
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 1,705	[2],[3]		₩ 1,649
Acquisition and others	[1]	0			0
Disposal and others	[1]	(586)			(317)
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	160			373
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 1,279	[2],[3]		₩ 1,705	[2],[3]	₩ 1,649
KB GwS Private Securities Investment Trust
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 136,168	[3]		₩ 134,362
Acquisition and others	[1]	0			0
Disposal and others	[1]	0			0
Dividends	[1],[3]	(9,525)			(9,297)
Gains(losses) on equity-method accounting	[1]	14,716			11,103
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 141,359	[3]		₩ 136,168	[3]	₩ 134,362
KB Star Office Private Real Estate Investment Trust No.1
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 19,839	[3]		₩ 19,839
Acquisition and others	[1]	0			0
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	227			0
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 20,066	[3]		₩ 19,839	[3]	₩ 19,839
PT Bank Bukopin TBK
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1],[4]	₩ 121,381	[3]		₩ 113,932
Acquisition and others	[1],[4]	43,909			0
Disposal and others	[1],[4]	(54,069)			0
Dividends	[1],[3],[4]	0			0
Gains(losses) on equity-method accounting	[1],[4]	(107,258)			(1,236)
Other comprehensive income	[1],[4]	(3,963)			10,408
Impairment loss	[1],[4]				(1,723)
Ending	[1],[4]	₩ 0	[3]		₩ 121,381	[3]	₩ 113,932
Balhae Infrastructure Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 101,391	[2],[3]		₩ 108,050
Acquisition and others	[1]	893			592
Disposal and others	[1]	0			0
Dividends	[1],[3]	(6,973)			(6,855)
Gains(losses) on equity-method accounting	[1]	11,313			(396)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 106,624	[2],[3]		₩ 101,391	[2],[3]	₩ 108,050
Aju Good Technology Venture Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 23,016	[3]		₩ 18,134
Acquisition and others	[1]	0			1,960
Disposal and others	[1]	(2,885)			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	1,217			2,922
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 21,348	[3]		₩ 23,016	[3]	₩ 18,134
SY Auto Capital Co., Ltd.
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 12,725	[3]		₩ 10,672
Acquisition and others	[1]	0			0
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	3,422			2,158
Other comprehensive income	[1]	(3)			(105)
Impairment loss	[1]				0
Ending	[1]	₩ 16,144	[3]		₩ 12,725	[3]	₩ 10,672
Big Dipper Co., Ltd.
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 125	[3]		₩ 280
Acquisition and others	[1]	0			0
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	(125)			(155)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	0	[3]		₩ 125	[3]	₩ 280
APRO Co., Ltd.
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship					Associates		Associates
Beginning	[1]	₩ 2,790	[2],[3]		₩ 1,403
Acquisition and others	[1]				0
Disposal and others	[1]				0
Dividends	[1],[3]				0
Gains(losses) on equity-method accounting	[1]				1,386
Other comprehensive income	[1]				1
Impairment loss	[1]				0
Ending	[1]				₩ 2,790	[2],[3]	₩ 1,403
Paycoms Co., Ltd.
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 45	[3],[5]		₩ 103
Acquisition and others	[1]	0			0
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	153			(58)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 198	[3],[5]		₩ 45	[3],[5]	₩ 103
Food Factory Co., Ltd.
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 1,000	[3],[6]		₩ 928
Acquisition and others	[1]	0			0
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	247			72
Other comprehensive income	[1]	34			0
Impairment loss	[1]				0
Ending	[1]	₩ 1,281	[3],[6]		₩ 1,000	[3],[6]	₩ 928
KB Private Equity Fund No.3
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 7,754	[2],[3]		₩ 7,830
Acquisition and others	[1]	0			0
Disposal and others	[1]	(8,000)			0
Dividends	[1],[3]	(2,082)			0
Gains(losses) on equity-method accounting	[1]	2,422			(76)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 94	[2],[3]		₩ 7,754	[2],[3]	₩ 7,830
Korea Credit Bureau Co., Ltd.
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 5,991	[2],[3]		₩ 5,941
Acquisition and others	[1]	0			0
Disposal and others	[1]	0			0
Dividends	[1],[3]	(89)			(135)
Gains(losses) on equity-method accounting	[1]	1,251			185
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 7,153	[2],[3]		₩ 5,991	[2],[3]	₩ 5,941
KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No. 2
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 13,616	[3]		₩ 14,601
Acquisition and others	[1]	0			0
Disposal and others	[1]	(3,231)			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	(540)			(985)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 9,845	[3]		₩ 13,616	[3]	₩ 14,601
Keystone-Hyundai Securities No. 1 Private Equity Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 1,625	[2],[3]		₩ 1,581
Acquisition and others	[1]	0			66
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	(69)			(26)
Other comprehensive income	[1]	0			4
Impairment loss	[1]				0
Ending	[1]	₩ 1,556	[2],[3]		₩ 1,625	[2],[3]	₩ 1,581
POSCO-KB Shipbuilding Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 6,847	[3]		₩ 4,463
Acquisition and others	[1]	5,000			2,500
Disposal and others	[1]	(2,125)			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	3,173			(116)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	12,895	[3]		₩ 6,847	[3]	₩ 4,463
GH Real Estate I LP
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship					Associates		Associates
Beginning	[1]	₩ 19,042	[3]		₩ 17,252
Acquisition and others	[1]				0
Disposal and others	[1]				0
Dividends	[1],[3]				0
Gains(losses) on equity-method accounting	[1]				1,553
Other comprehensive income	[1]				237
Impairment loss	[1]				0
Ending	[1]				₩ 19,042	[3]	₩ 17,252
UNION Media Commerce Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 961	[3]		₩ 962
Acquisition and others	[1]	0			0
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	(1)			(1)
Other comprehensive income	[1]	0			0
Others	[1]				0
Impairment loss	[1]				0
Ending	[1]	₩ 960	[3]		₩ 961	[3]	₩ 962
KBSP Private Equity Fund No.4
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates
Beginning	[1],[2],[3]	₩ 5,904
Acquisition and others	[1]	0			₩ 6,100
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	46			(196)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1],[2],[3]	₩ 5,950			₩ 5,904
KB Social Impact Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates
Beginning	[1],[3]	₩ 1,465
Acquisition and others	[1]	1,500			₩ 1,500
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	(91)			(35)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1],[3]	₩ 2,874			₩ 1,465
KB-Solidus Global Healthcare Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates
Beginning	[1],[3]	₩ 45,718
Acquisition and others	[1]	10,920			₩ 42,697
Disposal and others	[1]	(4,940)			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	(5,485)			3,021
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1],[3]	₩ 46,213			₩ 45,718
KB-Stonebridge Secondary Private Equity Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates
Beginning	[1],[2],[3]	₩ 4,944
Acquisition and others	[1]	9,093			₩ 7,070
Disposal and others	[1]	0			(1,855)
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	2,599			(271)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1],[2],[3]	₩ 16,636			₩ 4,944
KB SPROTT Renewable Private Equity Fund No.1
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates
Beginning	[1],[3]	₩ 1,295
Acquisition and others	[1]	4,128			₩ 1,667
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	(374)			(372)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1],[3]	₩ 5,049			₩ 1,295
KB-UTC Inno-Tech Venture Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates
Beginning	[1],[3]	₩ 417
Acquisition and others	[1]	16,966			₩ 450
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	(384)			(33)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1],[3]	₩ 16,999			₩ 417
KB-KDBC Pre-IPO New Technology Business Investment Fund [Member]
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Joint ventures		Joint ventures	Joint ventures		Joint ventures
Beginning	[1]	₩ 18,988	[3],[7]		₩ 14,594
Acquisition and others	[1]	0			5,000
Disposal and others	[1]	(6,399)			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	3,453			(606)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 16,042	[3],[7]		₩ 18,988	[3],[7]	₩ 14,594
KB-TS Technology Venture Private Equity Fund [Member]
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Joint ventures		Joint ventures	Joint ventures		Joint ventures
Beginning	[1]	₩ 19,731	[3],[7]		₩ 13,777
Acquisition and others	[1]	2,240			7,440
Disposal and others	[1]	(5,488)			(1,840)
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	1,232			269
Other comprehensive income	[1]	(85)			85
Impairment loss	[1]				0
Ending	[1]	₩ 17,630	[3],[7]		₩ 19,731	[3],[7]	₩ 13,777
KB-Brain KOSDAQ Scale-up New Technology Business Investment Fund [Member]
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Joint ventures		Joint ventures	Joint ventures		Joint ventures
Beginning	[1]	₩ 19,752	[3],[7]		₩ 7,930
Acquisition and others	[1]	8,000			13,250
Disposal and others	[1]	(3,200)			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	2,211			(1,428)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 26,763	[7]		₩ 19,752	[3],[7]	₩ 7,930
KB-SJ Tourism Venture Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates		Associates
Beginning	[1]	₩ 2,761	[2],[3]		₩ 1,386
Acquisition and others	[1]	1,500			1,500
Disposal and others	[1]	0			0
Dividends	[1],[3]	0			0
Gains(losses) on equity-method accounting	[1]	(128)			(125)
Other comprehensive income	[1]	0			0
Impairment loss	[1]				0
Ending	[1]	₩ 4,133	[2],[3]		₩ 2,761	[2],[3]	₩ 1,386
Incheon Bridge Co., Ltd.
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates	Associates
Acquisition and others	[1]	₩ 0
Disposal and others	[1]	0
Dividends	[1],[3]	0
Gains(losses) on equity-method accounting	[1]	0
Other comprehensive income	[1]	0
Ending	[1],[2],[3]	₩ 0
WJ Private Equity Fund No.1
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates
Acquisition and others	[1]	₩ 10,000
Disposal and others	[1]	0
Dividends	[1],[3]	0
Gains(losses) on equity-method accounting	[1]	(289)
Other comprehensive income	[1]	0
Ending	[1],[3]	₩ 9,711
All Together Korea Fund No.2
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates
Acquisition and others	[1]	₩ 100,000
Disposal and others	[1]	(90,000)
Dividends	[1],[3]	0
Gains(losses) on equity-method accounting	[1]	150
Other comprehensive income	[1]	(127)
Ending	[1],[3]	₩ 10,023
KB-NAU Special Situation Corporate Restructuring Private Equity Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates
Acquisition and others	[1]	₩ 5,700
Disposal and others	[1]	0
Dividends	[1],[3]	0
Gains(losses) on equity-method accounting	[1]	(89)
Other comprehensive income	[1]	0
Ending	[1],[2],[3]	₩ 5,611
JR GLOBAL REIT
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates
Acquisition and others	[1]	₩ 219,493
Disposal and others	[1]	(3,639)
Dividends	[1],[3]	0
Gains(losses) on equity-method accounting	[1]	0
Other comprehensive income	[1]	0
Ending	[1],[3]	₩ 215,854
Project Vanilla Co., Ltd.
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates
Acquisition and others	[1]	₩ 2,450
Disposal and others	[1]	0
Dividends	[1],[3]	0
Gains(losses) on equity-method accounting	[1]	(299)
Other comprehensive income	[1]	0
Ending	[1],[3]	₩ 2,151
December & Company Inc.
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates
Acquisition and others	[1]	₩ 30,000
Disposal and others	[1]	(5,151)
Dividends	[1],[3]	0
Gains(losses) on equity-method accounting	[1]	(447)
Other comprehensive income	[1]	0
Ending	[1],[2],[3]	₩ 24,402
2020 KB Fintech Renaissance Fund
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates
Acquisition and others	[1]	₩ 550
Disposal and others	[1]	0
Dividends	[1],[3]	0
Gains(losses) on equity-method accounting	[1]	(3)
Other comprehensive income	[1]	0
Ending	[1],[2],[3]	₩ 547
KB Material and Parts No.1 PEF
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates
Acquisition and others	[1]	₩ 3,400
Disposal and others	[1]	0
Dividends	[1],[3]	0
Gains(losses) on equity-method accounting	[1]	(29)
Other comprehensive income	[1]	0
Ending	[1],[2],[3]	₩ 3,371
FineKB Private Equity Fund No.1
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Description of nature of related party relationship		Associates		Associates
Acquisition and others	[1]	₩ 0
Disposal and others	[1]	0
Dividends	[1],[3]	0
Gains(losses) on equity-method accounting	[1]	0
Other comprehensive income	[1]	0
Ending	[1],[3]	0
Others
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Beginning	[1]	1,244			₩ 5,263
Acquisition and others	[1]				408
Disposal and others	[1]				(4,463)
Dividends	[1]				0
Gains(losses) on equity-method accounting	[1]				667
Other comprehensive income	[1]				212
Impairment loss	[1]				(843)
Ending	[1]				1,244		₩ 5,263
Others 2020
Disclosure Of Changes In Investments In Associates Line Items [Line Items]
Beginning	[1]	23,076
Acquisition and others	[1]	40,000
Disposal and others	[1]	(61,862)
Dividends	[1]	0
Gains(losses) on equity-method accounting	[1]	(899)
Other comprehensive income	[1]	359
Ending	[1]	₩ 674			₩ 23,076
[1]	Gains on disposal of investments in associates and joint ventures amount to KRW 1,423 million KRW 24,768 million for the years ended December 31, 2019 and 2020, respectively.
[2]	As of December 31, 2019 and 2020, the Group can exercise significant influence on the decision-making processes of the associate's financial and business policies through participation in governing bodies.
[3]	The condensed financial information of the associates and joint ventures is adjusted to reflect adjustments made by the Group, such as fair value adjustments made at the time of acquisition and adjustments for differences in accounting policies.
[4]	The investment was reclassified to subsidiaries from associates for the year ended December 31, 2020 due to additional share purchase.
[5]	The ownership of Paycoms Co., Ltd. would be 22.96% and 22.96% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond.
[6]	The ownership of Food Factory Co., Ltd. would be 30.00% and 30.00% as of December 31, 2019 and 2020, respectively, considering the potential voting rights from convertible bond.
[7]	In order to direct relevant activities, it is necessary to obtain the consent of the two co-operative members; the Group has applied the equity method as the Group cannot control the investee by itself.

Investments in Associates and_6

Investments in Associates and Joint Ventures_Accumulated Unrecognized Share Of Losses In Investments In Associates(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Total Of Unrecognised Share Of Losses Of Associates	₩ 3,839	₩ (1,741)
Accumulated unrecognized loss	20,040	16,201
Doosung Metal Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	0	46
Accumulated unrecognized loss	65	65
Incheon Bridge Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	3,354
Unrecognized loss		(1,944)
Accumulated unrecognized loss	18,100	14,746
Jungdong Steel Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	0	0
Accumulated unrecognized loss	489	489
Dpaps Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	19	14
Accumulated unrecognized loss	358	339
Shinla Construction Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	0	0
Accumulated unrecognized loss	183	183
Jaeyang Industry Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	0	0
Accumulated unrecognized loss	30	30
Terra Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	0	0
Accumulated unrecognized loss	14	14
Jungdo Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	151	0
Accumulated unrecognized loss	312	161
Jinseung Tech Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	0	18
Accumulated unrecognized loss	21	21
Korea NM Tech Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	0	0
Accumulated unrecognized loss	28	28
CHONG IL MACHINE & TOOLS Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	0	19
Accumulated unrecognized loss	19	19
SKYDIGITAL INC.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	0	106
Accumulated unrecognized loss	106	106
IMT TECHNOLOGY Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	3	0
Accumulated unrecognized loss	3	0
Jo Yang Industrial Co., Ltd.
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	96	0
Accumulated unrecognized loss	96	0
IDTECK CO., LTD
Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items]
Unrecognized loss	216	0
Accumulated unrecognized loss	₩ 216	₩ 0

Property and Equipment and In_2

Property and Equipment and Investment Properties_Property And Equipment(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		₩ 5,067,377	$ 5,002,766	₩ 4,842,991
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		5,067,377		4,842,991
Changes In Property Plant And Equipment Abstract [Abstract]
Acquisition		881,262		988,674
Transfers	[1]	(178,329)		(12,898)
Disposal		(212,960)		(168,769)
Depreciation	[2]	(629,116)		(598,921)
Business combination		497,043		0
Others		8,277		16,300
Ending(PPE)		5,433,554	$ 5,002,766	5,067,377
Depreciation Recognised In Profit Or Loss		123		111
Acquisition cost
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		9,327,847		8,371,641
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		8,371,641
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		9,327,847		8,371,641
Accumulated amortization
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		(3,887,416)		(3,296,209)
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		(3,296,209)
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		(3,887,416)		(3,296,209)
Accumulated Impairment losses [Member]
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		(6,877)		(8,055)
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		(8,055)
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		(6,877)		(8,055)
Reconciliation Of Changes In Accumulated Impairment Losses Of Property And Equipment [Abstract]
Beginning(Accumulated impairment losses of PPE)		(8,055)		(6,877)
Changes In Accumulated Impairment Of Property Plant And Equipment Abstract [Abstract]
Impairment		(12)		(1,178)
Reversal		0		0
Business combination		0		0
Disposal and Others		1,190		0
Ending(Accumaulated impairment losses of PPE)		(6,877)		(8,055)
Accumulated impairment losses on property and equipment excluding Right-of use assets
Reconciliation Of Changes In Accumulated Impairment Losses Of Property And Equipment [Abstract]
Beginning(Accumulated impairment losses of PPE)		(6,877)		(6,877)
Changes In Accumulated Impairment Of Property Plant And Equipment Abstract [Abstract]
Impairment		(12)		0
Reversal		0		0
Business combination		0		0
Disposal and Others		12		0
Ending(Accumaulated impairment losses of PPE)		(6,877)		(6,877)
Accumulated Impairment losses On Right Of Use Assets In Property And Equipment
Reconciliation Of Changes In Accumulated Impairment Losses Of Property And Equipment [Abstract]
Beginning(Accumulated impairment losses of PPE)		(1,178)		0
Changes In Accumulated Impairment Of Property Plant And Equipment Abstract [Abstract]
Impairment		0		(1,178)
Reversal		0		0
Business combination		0		0
Disposal and Others		1,178		0
Ending(Accumaulated impairment losses of PPE)		0		(1,178)
Land
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		2,610,586		2,430,794
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		2,430,794		2,432,041
Changes In Property Plant And Equipment Abstract [Abstract]
Acquisition		6,475		7,334
Transfers	[1]	(116,264)		(3,957)
Disposal		(2,578)		(4,907)
Depreciation	[2]	0		0
Business combination		295,421		0
Others		(3,262)		283
Ending(PPE)		2,610,586		2,430,794
Land | Acquisition cost
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		2,611,604		2,431,812
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		2,431,812
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		2,611,604		2,431,812
Land | Accumulated amortization
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		0		0
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		0
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		0		0
Land | Accumulated Impairment losses [Member]
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		(1,018)		(1,018)
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		(1,018)
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		(1,018)		(1,018)
Buildings
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		1,771,582		1,502,923
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		1,502,923		1,330,211
Changes In Property Plant And Equipment Abstract [Abstract]
Acquisition		43,592		10,908
Transfers	[1]	190,917		220,535
Disposal		(4,442)		(9,964)
Depreciation	[2]	(61,339)		(55,669)
Business combination		100,984		0
Others		(1,053)		6,902
Ending(PPE)		1,771,582		1,502,923
Buildings | Acquisition cost
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		2,607,957		2,265,929
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		2,265,929
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		2,607,957		2,265,929
Buildings | Accumulated amortization
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		(830,516)		(757,147)
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		(757,147)
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		(830,516)		(757,147)
Buildings | Accumulated Impairment losses [Member]
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		(5,859)		(5,859)
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		(5,859)
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		(5,859)		(5,859)
Leasehold improvements
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		95,827		116,124
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		116,124		122,309
Changes In Property Plant And Equipment Abstract [Abstract]
Acquisition		13,348		13,398
Transfers	[1]	34,596		58,645
Disposal		(574)		(338)
Depreciation	[2]	(73,394)		(77,948)
Business combination		5,087		0
Others		640		58
Ending(PPE)		95,827		116,124
Leasehold improvements | Acquisition cost
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		929,120		865,531
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		865,531
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		929,120		865,531
Leasehold improvements | Accumulated amortization
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		(833,293)		(749,407)
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		(749,407)
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		(833,293)		(749,407)
Leasehold improvements | Accumulated Impairment losses [Member]
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		0		0
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		0
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		0		0
Equipment and vehicles
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		340,658		380,353
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		380,353		280,624
Changes In Property Plant And Equipment Abstract [Abstract]
Acquisition		161,515		283,896
Transfers	[1]	3,705		(4)
Disposal		(1,990)		(526)
Depreciation	[2]	(221,697)		(183,900)
Business combination		19,873		0
Others		(1,101)		263
Ending(PPE)		340,658		380,353
Equipment and vehicles | Acquisition cost
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		2,040,100		1,867,739
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		1,867,739
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		2,040,100		1,867,739
Equipment and vehicles | Accumulated amortization
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		(1,699,442)		(1,487,386)
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		(1,487,386)
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		(1,699,442)		(1,487,386)
Equipment and vehicles | Accumulated Impairment losses [Member]
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		0		0
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		0
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		0		0
Construction in progress
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		44,190		86,303
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		86,303		88,618
Changes In Property Plant And Equipment Abstract [Abstract]
Acquisition		229,927		293,204
Transfers	[1]	(291,336)		(288,136)
Disposal		0		0
Depreciation	[2]	0		0
Business combination		20,022		0
Others		(726)		(7,383)
Ending(PPE)		44,190		86,303
Construction in progress | Acquisition cost
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		44,190		86,303
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		86,303
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		44,190		86,303
Construction in progress | Accumulated amortization
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		0		0
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		0
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		0		0
Construction in progress | Accumulated Impairment losses [Member]
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		0		0
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		0
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		0		0
Right-of-use assets In Property and Equipment
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		570,711		550,880
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		550,880		589,188
Changes In Property Plant And Equipment Abstract [Abstract]
Acquisition		426,405		379,934
Transfers	[1]	53		19
Disposal		(203,376)		(153,034)
Depreciation	[2]	(272,686)		(281,404)
Business combination		55,656		0
Others		13,779		16,177
Ending(PPE)		570,711		550,880
Right-of-use assets In Property and Equipment | Acquisition cost
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		1,094,876		854,327
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		854,327
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		1,094,876		854,327
Right-of-use assets In Property and Equipment | Accumulated amortization
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		(524,165)		(302,269)
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		(302,269)
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		(524,165)		(302,269)
Right-of-use assets In Property and Equipment | Accumulated Impairment losses [Member]
Disclosure Of Property Plant And Equipment Line Items [Line Items]
Carrying amount		0		(1,178)
Reconciliation Of Changes In Property And Equipment [Abstract]
Beginning(PPE)		(1,178)
Changes In Property Plant And Equipment Abstract [Abstract]
Ending(PPE)		₩ 0		₩ (1,178)
[1]	Includes transfers with investment properties and assets held for sale.
[2]	Includes depreciation expenses amounting to KRW 111 million and KRW 123 million recorded as other operating expenses for the years ended December 31, 2019 and 2020, respectively.

Property and Equipment and In_3

Property and Equipment and Investment Properties_Investment Property(Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2020KRW (₩)	Dec. 31, 2019KRW (₩)
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	₩ 2,533,539	$ 2,332,673	₩ 2,827,988	₩ 2,533,539	₩ 2,827,988
Fair value				2,712,653	3,032,726
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	2,827,988		2,119,811
Changes In Investment Property Abstract [Abstract]
Acquisition	53,196		806,088
Transfers	99,077		(12,235)
Disposal	(545,347)		(64,098)
Depreciation	(38,717)		(36,877)
Business combination	149,113
Others	(11,771)		15,299
Ending	2,533,539	$ 2,332,673	2,827,988
Acquisition cost
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	2,661,245		3,000,976	2,661,245	3,000,976
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	3,000,976
Changes In Investment Property Abstract [Abstract]
Ending	2,661,245		3,000,976
Accumulated amortization
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	(122,833)		(172,988)	(122,833)	(172,988)
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	(172,988)
Changes In Investment Property Abstract [Abstract]
Ending	(122,833)		(172,988)
Accumulated Impairment losses [Member]
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	(4,873)		0	(4,873)	0
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	0
Changes In Investment Property Abstract [Abstract]
Ending	(4,873)		0
Land
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	1,568,098		1,537,240	1,568,098	1,537,240
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	1,537,240		972,562
Changes In Investment Property Abstract [Abstract]
Acquisition	34,529		580,255
Transfers	61,383		(3,374)
Disposal	(167,015)		(13,318)
Depreciation	0		0
Business combination	106,944
Others	(4,983)		1,115
Ending	1,568,098		1,537,240
Land | Acquisition cost
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	1,568,508		1,537,240	1,568,508	1,537,240
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	1,537,240
Changes In Investment Property Abstract [Abstract]
Ending	1,568,508		1,537,240
Land | Accumulated amortization
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	0		0	0	0
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	0
Changes In Investment Property Abstract [Abstract]
Ending	0		0
Land | Accumulated Impairment losses [Member]
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	(410)		0	(410)	0
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	0
Changes In Investment Property Abstract [Abstract]
Ending	(410)		0
Buildings
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	965,441		1,290,748	965,441	1,290,748
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	1,290,748		1,147,249
Changes In Investment Property Abstract [Abstract]
Acquisition	18,667		225,833
Transfers	37,694		(8,861)
Disposal	(378,332)		(50,780)
Depreciation	(38,717)		(36,877)
Business combination	42,169
Others	(6,788)		14,184
Ending	965,441		1,290,748
Buildings | Acquisition cost
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	1,092,737		1,463,736	1,092,737	1,463,736
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	1,463,736
Changes In Investment Property Abstract [Abstract]
Ending	1,092,737		1,463,736
Buildings | Accumulated amortization
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	(122,833)		(172,988)	(122,833)	(172,988)
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	(172,988)
Changes In Investment Property Abstract [Abstract]
Ending	(122,833)		(172,988)
Buildings | Accumulated Impairment losses [Member]
Disclosure Of Investment Property Line Items [Line Items]
Carrying amount	(4,463)		0	₩ (4,463)	₩ 0
Reconciliation Of Changes In Investment Property Abstract [Abstract]
Beginning	0
Changes In Investment Property Abstract [Abstract]
Ending	₩ (4,463)		₩ 0

Property and Equipment and In_4

Property and Equipment and Investment Properties_Valuation Technique And Input Variables That Are Used To Measure The Fair Value Of Investment Property(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 2,712,653	₩ 3,032,726
Land and buildings
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 2,712,653	₩ 3,032,726
Description Of Extent To Which Fair Value Of Investment Property Is Based On Valuation By Independent Valuer	The investment properties were measured by qualified independent appraisers with experience in valuing similar properties in the same area.
Description Of Investment Property Of Level Of Fair Value Hierarchy Within Which Fair Value Measurement Is Categorised	In addition, per fair value hierarchy on Note 6.1.2, the fair value hierarchy of all investment properties has been classified as Level 3.
Land and buildings | Cost Approach Method
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 92,128
Description Of Inputs Used In Fair Value Measurement Investment Property	- Price per square meter - Replacement cost
Land and buildings | Market comparision Method
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 1,141,121
Description Of Inputs Used In Fair Value Measurement Investment Property	- Price per square meter
Land and buildings | Cash flow approach
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 1,248,604
Description Of Inputs Used In Fair Value Measurement Investment Property	- Prospective rental market growth rate - Period of vacancy - Rental rate - Discount rate and others
Land and buildings | Income approach
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items]
Fair value	₩ 230,800
Description Of Inputs Used In Fair Value Measurement Investment Property	- Discount rate - Capitalization rate - Vacancy rate

Property and Equipment and In_5

Property and Equipment and Investment Properties_Rental income from the above investment properties(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Rental Income From Investment Property Net Of Direct Operating Expense Abstract [Abstract]
Rental income from the investment properties	₩ 157,652	₩ 129,944

Intangible Assets_Intangible As

Intangible Assets_Intangible Assets(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		₩ 3,351,133	$ 3,085,445	₩ 2,737,813
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		2,737,813
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		3,351,133	$ 3,085,445	2,737,813
Insurance expenses and other operating expenses and others in the statements of comprehensive income		173,992		193,085
Acquisition cost
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		5,815,262		4,766,685
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		4,766,685
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		5,815,262		4,766,685
Accumulated amortization
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(2,304,188)		(1,926,647)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(1,926,647)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(2,304,188)		(1,926,647)
Accumulated Impairment losses [Member]
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(106,781)		(102,169)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(102,169)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(106,781)		(102,169)
Others
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(53,160)		(56)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(56)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(53,160)		(56)
Goodwill
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		763,582		275,741
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		275,741
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		763,582		275,741
Reconciliation Of Changes In Accumulated Impairment Losses Of Intangible Assets Intangible Assets And Goodwill Abstract [Abstract]
Beginning(Accumulated impairment losses of Intangible assets and goodwill)		(70,517)		(70,517)
Changes In Accumulated Impairment Intangible Assets And Goodwill Abstract [Abstract]
Impairment		0		0
Others		0		0
Ending(Accumulated impairment losses of Intangible assets and goodwill)		(70,517)		(70,517)
Goodwill | Acquisition cost
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		887,259		346,314
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		346,314
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		887,259		346,314
Goodwill | Accumulated amortization
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		0		0
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		0
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		0		0
Goodwill | Accumulated Impairment losses [Member]
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(70,517)		(70,517)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(70,517)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(70,517)		(70,517)
Goodwill | Others
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(53,160)		(56)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(56)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(53,160)		(56)
Other intangible assets
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		2,587,551		2,462,072
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		2,462,072		2,480,621
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Acquisition&Transfer		403,904		335,543
Disposal		(14,118)		(14,694)
Amortization	[1]	(381,192)		(341,829)
Business combination		124,697
Others		(7,812)		2,431
Ending		2,587,551		2,462,072
Reconciliation Of Changes In Accumulated Impairment Losses Of Intangible Assets Intangible Assets And Goodwill Abstract [Abstract]
Beginning(Accumulated impairment losses of Intangible assets and goodwill)		(31,652)		(45,017)
Changes In Accumulated Impairment Intangible Assets And Goodwill Abstract [Abstract]
Impairment		(9,312)		(1,578)
Reversal		3,669		6,859
Disposal and others		1,031		8,084
Ending(Accumulated impairment losses of Intangible assets and goodwill)		(36,264)		(31,652)
Other intangible assets | Acquisition cost
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		4,928,003		4,420,371
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		4,420,371
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		4,928,003		4,420,371
Other intangible assets | Accumulated amortization
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(2,304,188)		(1,926,647)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(1,926,647)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(2,304,188)		(1,926,647)
Other intangible assets | Accumulated Impairment losses [Member]
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(36,264)		(31,652)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(31,652)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(36,264)		(31,652)
Other intangible assets | Others
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		0		0
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		0
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending				0
Industrial property rights
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		2,346		2,853
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		2,853		4,497
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Acquisition&Transfer		116		174
Disposal		(147)		(1,160)
Amortization	[1]	(476)		(658)
Business combination		0
Others		0		0
Ending		2,346		2,853
Industrial property rights | Acquisition cost
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		6,222		5,802
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		5,802
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		6,222		5,802
Industrial property rights | Accumulated amortization
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(2,936)		(2,930)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(2,930)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(2,936)		(2,930)
Industrial property rights | Accumulated Impairment losses [Member]
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(940)		(19)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(19)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(940)		(19)
Software
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		573,187		373,519
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		373,519		204,505
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Acquisition&Transfer		340,045		274,583
Disposal		(4,444)		0
Amortization	[1]	(153,876)		(105,228)
Business combination		18,252
Others		(309)		(341)
Ending		573,187		373,519
Software | Acquisition cost
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		1,800,686		1,428,655
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		1,428,655
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		1,800,686		1,428,655
Software | Accumulated amortization
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(1,225,173)		(1,055,136)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(1,055,136)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(1,225,173)		(1,055,136)
Software | Accumulated Impairment losses [Member]
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(2,326)		0
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		0
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(2,326)		0
Other intangible assets
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount	[2]	371,774		266,517
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning	[2]	266,517		248,611
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Acquisition&Transfer	[2]	63,743		59,776
Disposal	[2]	(9,527)		(13,534)
Amortization	[1],[2]	(47,948)		(33,590)
Business combination	[2]	106,445
Others	[2]	(7,456)		5,254
Ending	[2]	371,774		266,517
Other intangible assets | Acquisition cost
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		690,665		555,424
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		555,424
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		690,665		555,424
Other intangible assets | Accumulated amortization
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(285,893)		(257,274)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(257,274)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(285,893)		(257,274)
Other intangible assets | Accumulated Impairment losses [Member]
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(32,998)		(31,633)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(31,633)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(32,998)		(31,633)
Value of Business Acquired (VOBA)
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		1,635,619		1,809,485
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		1,809,485		2,001,945
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Acquisition&Transfer		0		0
Disposal		0		0
Amortization	[1]	(173,866)		(192,460)
Business combination		0
Others		0		0
Ending		1,635,619		1,809,485
Value of Business Acquired (VOBA) | Acquisition cost
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		2,395,291		2,395,290
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		2,395,290
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		2,395,291		2,395,290
Value of Business Acquired (VOBA) | Accumulated amortization
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(759,672)		(585,805)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(585,805)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(759,672)		(585,805)
Value of Business Acquired (VOBA) | Accumulated Impairment losses [Member]
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		0		0
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		0
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		0		0
Right-of-use intangible assets
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		4,625		9,698
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		9,698		21,063
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Acquisition&Transfer		0		1,010
Disposal		0		0
Amortization	[1]	(5,026)		(9,893)
Business combination		0
Others		(47)		(2,482)
Ending		4,625		9,698
Right-of-use intangible assets | Acquisition cost
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		35,139		35,200
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		35,200
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		35,139		35,200
Right-of-use intangible assets | Accumulated amortization
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		(30,514)		(25,502)
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		(25,502)
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		(30,514)		(25,502)
Right-of-use intangible assets | Accumulated Impairment losses [Member]
Disclosure Of Intangible Assets Line Items [Line Items]
Carrying Amount		0		0
Reconciliation of changes in intangible assets and goodwill [abstract]
Beginning		0
Changes In Intangible Assets Other Than Goodwill Abstract [Abstract]
Ending		₩ 0		₩ 0
[1]	Includes KRW 193,085 million and KRW 173,992 million recorded as insurance expenses and other operating expenses for the years ended December 31, 2019 and 2020, respectively.
[2]	Impairment losses for membership right of other intangible asset with indefinite useful life was recognized when its recoverable amount is lower than its carrying amount, and reversal of impairment losses was recognized when its recoverable amount is higher than its carrying amount.

Intangible Assets_Goodwill(Deta

Intangible Assets_Goodwill(Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Goodwill Line Items [Line Items]
Acquisition cost		₩ 887,259	₩ 346,314
Carrying amount	[1]	763,582	275,741
Housing&Commercial Bank
Goodwill Line Items [Line Items]
Acquisition cost		65,288	65,288
Carrying amount	[1]	65,288	65,288
KB Cambodia Bank
Goodwill Line Items [Line Items]
Acquisition cost		1,202	1,202
Carrying amount	[1]	0	0
KB Securities Co., Ltd.
Goodwill Line Items [Line Items]
Acquisition cost		70,265	70,265
Carrying amount	[1]	58,889	58,889
KB Capital Co.,Ltd.
Goodwill Line Items [Line Items]
Acquisition cost		79,609	79,609
Carrying amount	[1]	79,609	79,609
KB Savings Bank Co., Ltd.
Goodwill Line Items [Line Items]
Acquisition cost		115,343	115,343
Carrying amount	[1]	57,404	57,404
KB Securities Vietnam Joint Stock Company
Goodwill Line Items [Line Items]
Acquisition cost		13,092	13,092
Carrying amount	[1]	12,234	12,987
KB Daehan Specialized Bank PLC.
Goodwill Line Items [Line Items]
Acquisition cost		1,515	1,515
Carrying amount	[1]	1,470	1,564
PRASAC Microfinance Institution Plc.
Goodwill Line Items [Line Items]
Acquisition cost		396,942	0
Carrying amount	[1]	356,570	0
PT Sunindo Kookmin Best Finance
Goodwill Line Items [Line Items]
Acquisition cost		2,963	0
Carrying amount	[1]	2,963	0
PT Bank Bukopin TBK
Goodwill Line Items [Line Items]
Acquisition cost		89,220	0
Carrying amount	[1]	80,002	0
PT. KB Finansia Multi Finance
Goodwill Line Items [Line Items]
Acquisition cost		51,820	0
Carrying amount	[1]	₩ 49,153	₩ 0
[1]	Includes the effect of exchange differences etc.

Intangible Assets_Allocating Go

Intangible Assets_Allocating Goodwill To Cash_Generating Units And Related Information For Impairment Testing(Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items]
Carrying amounts of goodwill	₩ 683,580
Recoverable amount exceeded carrying amount	₩ 3,592,780
Description of basis on which unit's recoverable amount has been determined	For impairment testing, goodwill is allocated to cash-generating units that are expected to benefit from the synergies of the business combination, and cash-generating units consist of an operating segment or units which are not larger than an operating segment. The Group recognized goodwill amounting to KRW 65,288 million from the merger of Housing & Commercial Bank, the amounts of KRW 49,315 million and KRW 15,973 million were allocated to the retail banking and corporate banking, respectively. And the goodwill of KRW 356,570 million arising from the acquisition of PRASAC Microfinance Institution Plc. was allocated to microfinance unit. Cash-generating units to which goodwill has been allocated is tested for impairment annually and whenever there is an indication that the unit may be impaired, by comparing the carrying amount of the unit, including the goodwill, with the recoverable amount of the unit.
Explanation of period over which management has projected cash flows	The recoverable amount of a cash-generating unit is measured at the higher of its fair value less costs to sell and its value in use.
Description of key assumptions on which management has based determination of fair value less costs of disposal	The projections of the future cash flows are based on the most recent financial budget approved by management and generally cover a period of five years.
Description of valuation techniques used to measure fair value less costs of disposal	Value in use is the present value of the future cash flows expected to be derived from an asset or cash-generating unit. The projections of the future cash flows are based on the most recent financial budget approved by management and generally cover a period of five years. The future cash flows of retail banking and corporate banking after projection period are estimated on the assumption that the future cash flows will increase by 1.0% per year. The key assumptions used for the estimation of the future cash flows are estimated based on the market size and the Group's market share. The future cash flows PRASAC Microfinance Institution Plc. after five years are estimated on the assumption that the future cash flows will increase by 3.0% per year. The key assumptions used for the estimation of the future cash flows are the GDP growth rate of Cambodia, the market size and the recent growth rate of PRASAC Microfinance Institution Plc. The discount rate is a pre-tax rate that reflects assumptions regarding risk-free interest rate, market risk premium and the risks specific to the cash-generating unit. The Group acquired a 67% stake in PT Bank Bukopin TBK with the acquisition date of September 2, 2020, and the goodwill recognized due to the business combination is KRW 80,002 million as of December 31, 2020. The Group conducts an impairment test annually and whenever there is an indication of impairment, and no indication of impairment has been observed as of December 31, 2020.
Retail Banking
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items]
Carrying amounts of goodwill	₩ 49,315
Recoverable amount exceeded carrying amount	₩ 1,595,304
Discount rate	17.46%
Permanent growth rate	1.00%
Corporate Banking
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items]
Carrying amounts of goodwill	₩ 15,973
Recoverable amount exceeded carrying amount	₩ 955,540
Discount rate	17.63%
Permanent growth rate	1.00%
KB Securities Co., Ltd.
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items]
Carrying amounts of goodwill	₩ 58,889
Recoverable amount exceeded carrying amount	₩ 11,340
Discount rate	21.46%
Permanent growth rate	1.00%
KB Capital Co.,Ltd.
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items]
Carrying amounts of goodwill	₩ 79,609
Recoverable amount exceeded carrying amount	₩ 424,933
Discount rate	17.39%
Permanent growth rate	1.00%
KB Savings Bank Co., Ltd.
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items]
Carrying amounts of goodwill	₩ 57,404
Recoverable amount exceeded carrying amount	₩ 443,778
Discount rate	13.80%
Permanent growth rate	1.00%
KB Securities Vietnam Joint Stock Company
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items]
Carrying amounts of goodwill	₩ 12,234
Recoverable amount exceeded carrying amount	₩ 10,262
Discount rate	23.61%
Permanent growth rate	1.00%
KB Daehan Specialized Bank PLC.
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items]
Carrying amounts of goodwill	₩ 1,470
Recoverable amount exceeded carrying amount	₩ 9,299
Discount rate	25.77%
Permanent growth rate	1.00%
PRASAC Microfinance Institution Plc.
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items]
Carrying amounts of goodwill	₩ 356,570
Recoverable amount exceeded carrying amount	₩ 111,425
Discount rate	24.50%
Permanent growth rate	3.00%
PT Sunindo Kookmin Best Finance
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items]
Carrying amounts of goodwill	₩ 2,963
Recoverable amount exceeded carrying amount	₩ 1,909
Discount rate	15.47%
Permanent growth rate	0.00%
PT. KB Finansia Multi Finance
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items]
Carrying amounts of goodwill	₩ 49,153
Recoverable amount exceeded carrying amount	₩ 28,990
Discount rate	16.19%
Permanent growth rate	3.00%

Lease_The Amounts Recognized In

Lease_The Amounts Recognized In The Consolidated Statement Of Financial Position And Comprehensive Income(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Disclosure of quantitative information about leases for lessee [Line Items]
Right-of-use assets		₩ 575,337	₩ 560,578
Lease liabilities		559,113	544,439
Interest expense on the lease liabilities		13,492	12,720
Expense relating to short-term lease		6,169	2,209
Expense relating to leases of low-value assets that are not short-term lease		7,130	5,416
Expense relating to variable lease payments not included in lease liabilities (included in administrative expenses)		438	15
Cash outflow for lease		245,151	228,312
The amounts recognized in the consolidated statement of financial position
Disclosure of quantitative information about leases for lessee [Line Items]
Right-of-use assets		575,337	560,578
Lease liabilities	[1]	₩ 559,113	₩ 544,439
Description of line items in statement of financial position which include right of use assets		It is included in property and equipment, intangible assets.	It is included in property and equipment, intangible assets.
Description of line items in statement of financial position which include lease liabilities		It is included in other liabilities.	It is included in other liabilities.
The amounts recognized in the consolidated statement of financial position | Right-of-use property and equipment
Disclosure of quantitative information about leases for lessee [Line Items]
Right-of-use assets		₩ 570,711	₩ 550,880
The amounts recognized in the consolidated statement of financial position | Real estate
Disclosure of quantitative information about leases for lessee [Line Items]
Right-of-use assets	[1]	537,392	518,795
The amounts recognized in the consolidated statement of financial position | Vehicles
Disclosure of quantitative information about leases for lessee [Line Items]
Right-of-use assets	[1]	16,218	13,542
The amounts recognized in the consolidated statement of financial position | Others
Disclosure of quantitative information about leases for lessee [Line Items]
Right-of-use assets	[1]	17,101	18,543
The amounts recognized in the consolidated statement of financial position | Right-of-use intangible assets
Disclosure of quantitative information about leases for lessee [Line Items]
Right-of-use assets	[1]	4,626	9,698
The amounts recognized in the consolidated statement of comprehensive income
Disclosure of quantitative information about leases for lessee [Line Items]
Depreciation and amortization of right-of-use assets		277,712	291,297
The amounts recognized in the consolidated statement of comprehensive income | Real estate
Disclosure of quantitative information about leases for lessee [Line Items]
Depreciation and amortization of right-of-use assets		246,058	251,465
The amounts recognized in the consolidated statement of comprehensive income | Vehicles
Disclosure of quantitative information about leases for lessee [Line Items]
Depreciation and amortization of right-of-use assets		15,286	19,594
The amounts recognized in the consolidated statement of comprehensive income | Others
Disclosure of quantitative information about leases for lessee [Line Items]
Depreciation and amortization of right-of-use assets		11,342	10,345
The amounts recognized in the consolidated statement of comprehensive income | Right-of-use intangible assets
Disclosure of quantitative information about leases for lessee [Line Items]
Depreciation and amortization of right-of-use assets		₩ 5,026	₩ 9,893
[1]	Included in property and equipment, intangible assets and other liabilities.

Finance Lease And Operating Lea

Finance Lease And Operating Lease As a Lessor(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Finance Lease By Lessor Abstract [Abstract]
Total lease investment	₩ 1,538,093	₩ 1,740,085
Present value of minimum lease payments	906,365	938,624
Present value of Non-guaranteed residual value	496,969	639,075
Net lease investment	1,403,334	1,577,699
Unearned interest income	134,759	162,386
Disclosure Of Operating Lease By Lessor Abstract [Abstract]
Minimum lease receipts	2,605,166	2,692,009
Up to 1 year
Disclosure Of Finance Lease By Lessor Abstract [Abstract]
Total lease investment	579,968	654,104
Present value of minimum lease payments	354,588	367,937
Disclosure Of Operating Lease By Lessor Abstract [Abstract]
Minimum lease receipts	792,935	577,490
1~5 years
Disclosure Of Finance Lease By Lessor Abstract [Abstract]
Total lease investment	958,125	1,085,208
Present value of minimum lease payments	551,777	569,939
Disclosure Of Operating Lease By Lessor Abstract [Abstract]
Minimum lease receipts	1,727,498	1,432,354
Over 5 years
Disclosure Of Finance Lease By Lessor Abstract [Abstract]
Total lease investment	0	773
Present value of minimum lease payments	0	748
Disclosure Of Operating Lease By Lessor Abstract [Abstract]
Minimum lease receipts	₩ 84,733	₩ 682,165

Lease Payment As an Operating L

Lease Payment As an Operating Lessee(Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)
Disclosure of quantitative information about leases for lessee [abstract]
Minimum lease payment	₩ 221,305
Sublease payment	(1,804)
Lease payment reflected in profit or loss	₩ 219,501

Deferred Income Tax Assets an_3

Deferred Income Tax Assets and Liabilities_Deferred Income Tax Assets And Liabilities(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)		Dec. 31, 2019KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2018KRW (₩)
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		₩ 2,493,796		₩ 1,715,391
Total deferred income tax liabilities		(3,591,024)		(2,489,587)
Total deferred income tax liabilities (assets)		(1,097,228)		(774,196)
Offsetting Of Deferred Income Tax Assets And Liabilities [Abstract]
Offsetting Of Deferred Income Tax Assets		(2,428,738)		(1,711,794)
Offsetting Of Deferred Income Tax Liabilities		2,428,738		1,711,794
Net Deferred Tax Assets And Liabilities Abstract [Abstract]
Total net deferred income tax assets		65,058		3,597	$ 59,900
Total net deferred income tax liabilities		(1,162,286)		(777,793)	$ (1,070,137)
Total net deferred income tax liabilities (assets)		(1,097,228)		(774,196)
Deductible Temporary Differences For Which No Deferred Tax Asset Is Recognised Abstract [Line Items]
Deductible Temporary Differences For Which No Deferred Tax Asset Is Recognised Other Provisions		3,054		4,788
Deductible Temporary Differences For Which No Deferred Tax Asset Is Recognised Investments In Subsidiaries And Others		242,875		67,645
Deductible Temporary Differences For Which No Deferred Tax Asset Is Recognised Others		75,831		125,158
Temporary Differences Associated With Investments In Subsidiaries Branches And Associates And Interests In Joint Ventures Abstract [Line Items]
Taxable Temporary Differences Associated With Investments In Subsidiaries Branches And Associates And Interests In Joint Ventures		(260,739)		(68,836)
Taxable Temporary Differences Associated With Business Combination		(65,288)		(65,288)
Gross Temporary Difference Unused Tax Losses And Unused Tax Credits Member [Member]
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		2,493,796		1,715,391
Total deferred income tax liabilities		(3,591,024)		(2,489,587)
Total deferred income tax liabilities (assets)		(1,097,228)		(774,196)
Other provisions
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		149,259		115,500
Total deferred income tax liabilities		0		0
Total deferred income tax liabilities (assets)		149,259		115,500
Allowances for credit losses
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		26,496		451
Total deferred income tax liabilities		(3,356)		(3,266)
Total deferred income tax liabilities (assets)		23,140		(2,815)
Impairment losses of property and equipment
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		3,992		4,396
Total deferred income tax liabilities		(1,889)		(1,952)
Total deferred income tax liabilities (assets)		2,103		2,444
Share based payments
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		17,718		18,002
Total deferred income tax liabilities		0		0
Total deferred income tax liabilities (assets)		17,718		18,002
Provisions for acceptance and guarantees
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		17,046		20,959
Total deferred income tax liabilities		0		0
Total deferred income tax liabilities (assets)		17,046		20,959
Gains or losses on valuation of derivatives
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		20,645		51,160
Total deferred income tax liabilities		(223,482)		(158,604)
Total deferred income tax liabilities (assets)		(202,837)		(107,444)
Present value discount
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		17,058		8,244
Total deferred income tax liabilities		(3,041)		(4,201)
Total deferred income tax liabilities (assets)		14,017		4,043
Gains or losses on fair value hedge
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		21,060		12,123
Total deferred income tax liabilities		0		0
Total deferred income tax liabilities (assets)		21,060		12,123
Accrued interest
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		0		0
Total deferred income tax liabilities		(125,835)		(110,359)
Total deferred income tax liabilities (assets)		(125,835)		(110,359)
Deferred loan origination fees and costs
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		7,224		531
Total deferred income tax liabilities		(226,821)		(199,000)
Total deferred income tax liabilities (assets)		(219,597)		(198,469)
Advnaced depreciation provision
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		0		0
Total deferred income tax liabilities		(1,703)		(1,703)
Total deferred income tax liabilities (assets)		(1,703)		(1,703)
Gains or losses on revaluation
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		338		549
Total deferred income tax liabilities		(319,698)		(329,331)
Total deferred income tax liabilities (assets)		(319,360)		(328,782)
Investments in subsidiaries and others
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		38,164		35,306
Total deferred income tax liabilities		(111,589)		(105,470)
Total deferred income tax liabilities (assets)		(73,425)		(70,164)
Gains or losses on valuation of security investment
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		73,857		39,949
Total deferred income tax liabilities		(1,232,689)		(265,934)
Total deferred income tax liabilities (assets)		(1,158,832)		(225,985)
Defined benefit liabilities
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		606,146		557,423
Total deferred income tax liabilities		0		0
Total deferred income tax liabilities (assets)		606,146		557,423
Accrued expenses
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		334,900		249,999
Total deferred income tax liabilities		0		0
Total deferred income tax liabilities (assets)		334,900		249,999
Retirement insurance expense
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		0		0
Total deferred income tax liabilities		(541,317)		(489,602)
Total deferred income tax liabilities (assets)		(541,317)		(489,602)
Adjustments to the prepaid contributions
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		0		0
Total deferred income tax liabilities		(28,261)		(22,897)
Total deferred income tax liabilities (assets)		(28,261)		(22,897)
Derivative linked securities
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		78,202		131,259
Total deferred income tax liabilities		(30,881)		(34,635)
Total deferred income tax liabilities (assets)		47,321		96,624
Others
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		1,081,691	[1]	469,540
Total deferred income tax liabilities		(740,462)	[1]	(762,633)
Total deferred income tax liabilities (assets)		341,229	[1]	(293,093)
Deductible temporary differences
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax assets		2,493,796		1,715,391		₩ 1,562,537
The changes in cumulative temporary differences
Beginning		6,186,895		5,641,699
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Ending		₩ 8,828,075		₩ 6,186,895
Tax rate		27.50%		27.50%
Deductible temporary differences | Gross Temporary Difference Unused Tax Losses And Unused Tax Credits Member [Member]
The changes in cumulative temporary differences
Beginning		₩ 6,384,486		₩ 5,839,583
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		2,390,767
Decrease		3,914,448		3,226,175
Increase		4,289,030		3,771,078
Ending		9,149,835		6,384,486
Deductible temporary differences | Other provisions
The changes in cumulative temporary differences
Beginning		424,383		411,903
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		6,383
Decrease		426,457		411,747
Increase		540,396		424,227
Ending		544,705		424,383
Deductible temporary differences | Allowances for credit losses
The changes in cumulative temporary differences
Beginning		2,018		12,481
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		105,505
Decrease		96,885		16,160
Increase		83,111		5,697
Ending		93,749		2,018
Deductible temporary differences | Impairment losses of property and equipment
The changes in cumulative temporary differences
Beginning		15,985		21,927
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		9,658		21,402
Increase		8,189		15,460
Ending		14,516		15,985
Deductible temporary differences | Share based payments
The changes in cumulative temporary differences
Beginning		63,092		60,071
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		5
Decrease		55,601		52,475
Increase		54,589		55,496
Ending		62,085		63,092
Deductible temporary differences | Provisions for acceptance and guarantees
The changes in cumulative temporary differences
Beginning		76,214		73,809
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		76,214		73,809
Increase		61,984		76,214
Ending		61,984		76,214
Deductible temporary differences | Gains or losses on valuation of derivatives
The changes in cumulative temporary differences
Beginning		186,035		503,277
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		5,201
Decrease		191,236		503,277
Increase		76,238		186,035
Ending		76,238		186,035
Deductible temporary differences | Present value discount
The changes in cumulative temporary differences
Beginning		29,978		24,593
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		29,732		24,347
Increase		61,783		29,732
Ending		62,029		29,978
Deductible temporary differences | Gains or losses on fair value hedge
The changes in cumulative temporary differences
Beginning		44,085		0
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		44,085		0
Increase		76,583		44,085
Ending		76,583		44,085
Deductible temporary differences | Deferred loan origination fees and costs
The changes in cumulative temporary differences
Beginning		1,930		1,841
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		35,863
Decrease		15,098		1,841
Increase		3,574		1,930
Ending		26,269		1,930
Deductible temporary differences | Investments in subsidiaries and others
The changes in cumulative temporary differences
Beginning		185,380		184,870
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		47,034		47,217
Increase		232,655		47,727
Ending		371,001		185,380
Deductible temporary differences | Gains or losses on valuation of security investment
The changes in cumulative temporary differences
Beginning		136,236		269,731
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		136,070		264,318
Increase		251,524		130,823
Ending		251,690		136,236
Deductible temporary differences | Defined benefit liabilities
The changes in cumulative temporary differences
Beginning		2,161,219		1,977,430
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		94,105
Decrease		227,010		200,827
Increase		327,255		384,616
Ending		2,355,569		2,161,219
Deductible temporary differences | Accrued expenses
The changes in cumulative temporary differences
Beginning		911,599		993,906
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		75,498
Decrease		911,599		994,326
Increase		1,144,785		912,019
Ending		1,220,283		911,599
Deductible temporary differences | Derivative linked securities
The changes in cumulative temporary differences
Beginning		477,307		13,679
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		477,307		13,679
Increase		284,370		477,307
Ending		284,370		477,307
Deductible temporary differences | Others
The changes in cumulative temporary differences
Beginning		1,669,025	[1]	1,290,065
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination	[1]	2,068,207
Decrease		1,170,462	[1]	600,750
Increase		1,081,994	[1]	979,710
Ending	[1]	3,648,764		1,669,025
Deductible temporary differences | Other provisions
The changes in cumulative temporary differences
Beginning		4,788		3,416
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Ending		3,054		4,788
Deductible temporary differences | Investments in subsidiaries and others
The changes in cumulative temporary differences
Beginning		67,645		73,764
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Ending		242,875		67,645
Deductible temporary differences | Others
The changes in cumulative temporary differences
Beginning		125,158		120,704
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Ending		75,831		125,158
Taxable temporary differences
Deferred Tax Assets And Liabilities Abstract [Abstract]
Total deferred income tax liabilities		(3,591,024)		(2,489,587)		₩ (2,050,913)
The changes in cumulative temporary differences
Beginning		(8,999,893)		(7,409,277)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Ending		₩ (12,981,620)		₩ (8,999,893)
Tax rate		27.50%		27.50%
Taxable temporary differences | Gross Temporary Difference Unused Tax Losses And Unused Tax Credits Member [Member]
The changes in cumulative temporary differences
Beginning		₩ (9,135,264)		₩ (7,537,520)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		(3,293,011)
Decrease		(4,817,114)		(5,320,410)
Increase		(5,697,528)		(6,918,154)
Ending		(13,308,689)		(9,135,264)
Taxable temporary differences | Allowances for credit losses
The changes in cumulative temporary differences
Beginning		(11,877)		(238)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		(11,877)		(238)
Increase		(12,203)		(11,877)
Ending		(12,203)		(11,877)
Taxable temporary differences | Impairment losses of property and equipment
The changes in cumulative temporary differences
Beginning		(4,163)		(4,457)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		(111)		(212)
Increase		117		82
Ending		(3,935)		(4,163)
Taxable temporary differences | Gains or losses on valuation of derivatives
The changes in cumulative temporary differences
Beginning		(576,743)		(49,036)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		(576,743)		(49,036)
Increase		(812,662)		(576,743)
Ending		(812,662)		(576,743)
Taxable temporary differences | Present value discount
The changes in cumulative temporary differences
Beginning		(15,278)		(8,656)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		(15,278)		(8,656)
Increase		(10,916)		(15,278)
Ending		(10,916)		(15,278)
Taxable temporary differences | Gains or losses on fair value hedge
The changes in cumulative temporary differences
Beginning		0		(94,085)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Decrease				(94,085)
Increase				0
Ending				0
Taxable temporary differences | Accrued interest
The changes in cumulative temporary differences
Beginning		(401,337)		(411,487)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		(168,859)
Decrease		(394,255)		(362,627)
Increase		(281,685)		(352,477)
Ending		(457,626)		(401,337)
Taxable temporary differences | Deferred loan origination fees and costs
The changes in cumulative temporary differences
Beginning		(752,178)		(727,528)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		(752,178)		(727,528)
Increase		(820,223)		(752,178)
Ending		(820,223)		(752,178)
Taxable temporary differences | Advnaced depreciation provision
The changes in cumulative temporary differences
Beginning		(6,192)		(6,192)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		0		0
Increase		0		0
Ending		(6,192)		(6,192)
Taxable temporary differences | Gains or losses on revaluation
The changes in cumulative temporary differences
Beginning		(1,197,566)		(1,201,992)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		(80,036)		(52,470)
Increase		(45,008)		(48,044)
Ending		(1,162,538)		(1,197,566)
Taxable temporary differences | Investments in subsidiaries and others
The changes in cumulative temporary differences
Beginning		(419,055)		(316,346)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		(70,188)		(19,421)
Increase		(297,809)		(122,130)
Ending		(646,676)		(419,055)
Taxable temporary differences | Gains or losses on valuation of security investment
The changes in cumulative temporary differences
Beginning		(906,790)		(601,496)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		(3,060,750)
Decrease		(899,660)		(594,206)
Increase		(1,358,042)		(899,500)
Ending		(4,425,922)		(906,790)
Taxable temporary differences | Retirement insurance expense
The changes in cumulative temporary differences
Beginning		(1,775,740)		(1,611,475)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		(61,789)
Decrease		(162,764)		(153,528)
Increase		(288,296)		(317,793)
Ending		(1,963,061)		(1,775,740)
Taxable temporary differences | Adjustments to the prepaid contributions
The changes in cumulative temporary differences
Beginning		(83,262)		(69,212)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		(83,262)		(69,212)
Increase		(102,768)		(83,262)
Ending		(102,768)		(83,262)
Taxable temporary differences | Derivative linked securities
The changes in cumulative temporary differences
Beginning		(125,947)		(271,873)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		(125,947)		(271,873)
Increase		(112,293)		(125,947)
Ending		(112,293)		(125,947)
Taxable temporary differences | Goodwill from merger
The changes in cumulative temporary differences
Beginning		(65,288)		(65,288)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination		0
Decrease		0		0
Increase		0		0
Ending		(65,288)		(65,288)
Taxable temporary differences | Others
The changes in cumulative temporary differences
Beginning		(2,793,848)	[1]	(2,098,159)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Business combination	[1]	(1,613)
Decrease		(1,644,815)	[1]	(2,917,318)
Increase		(1,555,740)	[1]	(3,613,007)
Ending	[1]	(2,706,386)		(2,793,848)
Taxable temporary differences | Goodwill from merger
The changes in cumulative temporary differences
Beginning		(65,288)		(65,288)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Ending		(65,288)		(65,288)
Taxable temporary differences | Investments in subsidiaries and others
The changes in cumulative temporary differences
Beginning		(68,836)		(62,367)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Ending		(260,739)		(68,836)
Taxable temporary differences | Others
The changes in cumulative temporary differences
Beginning		(1,247)		(588)
Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract]
Ending		₩ (1,042)		₩ (1,247)
[1]	Includes PPA amount from acquisition of Prudential Life Insurance Company of Korea Ltd. and KB Insurance Co., Ltd., and others.

Assets Held for Sale_Assets Hel

Assets Held for Sale_Assets Held For Sale(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2019KRW (₩)	Dec. 31, 2020USD ($)
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount		₩ 197,727	₩ 23,151	$ 182,051
Assets and liabilities classified as held for sale [Member]
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount		197,727	23,151
Fair value less costs to sell		₩ 208,369	26,770
Changes In Accumulated Impairment Of Assets Held For Sale Abstract [Abstract]
Description Of Noncurrent Asset Or Disposal Group Held For Sale Which Were Sold Or Reclassified		As of December 31, 2020, assets held for sale consist of 4 real estates of closed offices and 1,087 foreclosure assets on loans of PT Bank Bukopin TBK, which were determined to sell by the management, but not yet sold as of December 31, 2020. Negotiation with buyers is in process for the one closed office and the remaining 1,090 assets are also being actively marketed.
Assets and liabilities classified as held for sale [Member] | Acquisition cost
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount	[1]	₩ 243,842	25,933
Assets and liabilities classified as held for sale [Member] | Accumulated Impairment losses [Member]
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount		(46,115)	(2,782)
Reconciliation Of Changes In Accumulated Impairment Losses Of Assets Held For Sale Abstract [Abstract]
Beginning		(2,782)	(8,150)
Changes In Accumulated Impairment Of Assets Held For Sale Abstract [Abstract]
Provision		(11,593)	(333)
Reversal		0	0
Business combination		(45,433)
Disposal and others		13,693	5,701
Ending		(46,115)	(2,782)
Land held for sale
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount		64,571	13,012
Fair value less costs to sell		68,321	14,374
Land held for sale | Acquisition cost
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount	[1]	80,740	14,542
Land held for sale | Accumulated Impairment losses [Member]
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount		(16,169)	(1,530)
Buildings held for sale
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount		127,539	10,139
Fair value less costs to sell		134,247	12,396
Buildings held for sale | Acquisition cost
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount	[1]	152,426	11,391
Buildings held for sale | Accumulated Impairment losses [Member]
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount		(24,887)	₩ (1,252)
Other assets held for sale
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount		5,617
Fair value less costs to sell		5,801
Other assets held for sale | Acquisition cost
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount	[1]	10,676
Other assets held for sale | Accumulated Impairment losses [Member]
Disclosure Of Assets Held For Sale Line Items [Line Items]
Carrying amount		₩ (5,059)
[1]	Acquisition cost of buildings held for sale is net of accumulated depreciation before classified as assets held for sale.

Assets Held for Sale_The Valuat

Assets Held for Sale_The Valuation Technique And Input Variables That Are Used To Measure The Fair Value Of Assets Held For Sale(Details) - Land and buildings ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assests Held For Sale Line Items [Line Items]
Fair value	₩ 208,369
Unobservable input	Adjustment index	[1]
Range of unobservable inputs	0.68 ~1.95%
Relationship of unobservable inputs to fair value	Fair value increases as the adjustment index rises.
Description Of Valuation Processes Used In Fair Value Measurement Assets Held For Sale	Market comparison approach model	[2]
Description Of Assets Held For Sale Of Level Of Fair Value Hierarchy Within Which Fair Value Measurement Is Categorised	Among assets held for sale, real estate was measured by independent appraisers with recent experience in evaluating similar properties in the area of the property to be assessed with professional qualifications. All of assets held for sale are classified as level 3 in accordance with fair value hierarchy in Note 6.1.2.
[1]	Adjustment index is calculated using the time factor correction or local factors or individual factors.
[2]	The appraisal value is adjusted by the adjustment ratio in the event the public sale is unsuccessful.

Other Assets_Details Of Other A

Other Assets_Details Of Other Assets(Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)	Dec. 31, 2019KRW (₩)	Dec. 31, 2020USD ($)
Other Assests Line Items [Line Items]
Other assets	₩ 30,155,037	₩ 18,215,608	$ 27,764,256
Allowances for credit losses
Reconciliation Of Changes In Accumulated Impairment Losses Of Other Assets Abstract [Abstract]
Beginning	128,864	131,055
Changes In Accumulated Impairment Of Other Assets Abstract [Abstract]
Written-off	(15,020)	(6,035)
Provision (reversal)	23,879	9,492
Business combination	8,005
Others	(8,446)	(5,648)
Ending	137,282	128,864
Other financial assets
Other Assests Line Items [Line Items]
Other assets	14,167,689	9,147,059
Other financial assets | Other receivables
Other Assests Line Items [Line Items]
Other assets	10,628,272	5,792,814
Other financial assets | Accrued income
Other Assests Line Items [Line Items]
Other assets	1,726,651	1,659,182
Other financial assets | Guarantee deposits
Other Assests Line Items [Line Items]
Other assets	1,099,618	1,146,000
Other financial assets | Domestic exchange settlement debits
Other Assests Line Items [Line Items]
Other assets	722,616	531,356
Other financial assets | Others
Other Assests Line Items [Line Items]
Other assets	117,330	129,039
Other financial assets | Allowances for credit losses
Other Assests Line Items [Line Items]
Other assets	(119,762)	(104,629)
Reconciliation Of Changes In Accumulated Impairment Losses Of Other Assets Abstract [Abstract]
Beginning	104,629	106,275
Changes In Accumulated Impairment Of Other Assets Abstract [Abstract]
Written-off	(6,517)	(5,883)
Provision (reversal)	22,153	9,885
Business combination	7,946
Others	(8,449)	(5,648)
Ending	119,762	104,629
Other financial assets | Less Present value discount
Other Assests Line Items [Line Items]
Present value discount	(7,036)	(6,703)
Other non financial assets
Other Assests Line Items [Line Items]
Other assets	15,987,348	9,068,549
Other non financial assets | Other receivables
Other Assests Line Items [Line Items]
Other assets	1,091	1,294
Other non financial assets | Prepaid expenses
Other Assests Line Items [Line Items]
Other assets	254,152	198,893
Other non financial assets | Guarantee deposits
Other Assests Line Items [Line Items]
Other assets	3,906	4,084
Other non financial assets | Insurance assets
Other Assests Line Items [Line Items]
Other assets	2,376,679	1,662,016
Other non financial assets | Separate account assets
Other Assests Line Items [Line Items]
Other assets	10,210,047	5,052,804
Other non financial assets | Others
Other Assests Line Items [Line Items]
Other assets	3,158,993	2,173,693
Other non financial assets | Allowances for credit losses
Other Assests Line Items [Line Items]
Other assets	(17,520)	(24,235)
Reconciliation Of Changes In Accumulated Impairment Losses Of Other Assets Abstract [Abstract]
Beginning	24,235	24,780
Changes In Accumulated Impairment Of Other Assets Abstract [Abstract]
Written-off	(8,503)	(152)
Provision (reversal)	1,726	(393)
Business combination	59
Others	3	0
Ending	₩ 17,520	₩ 24,235

Financial Liabilities at Fair_3

Financial Liabilities at Fair Value Through Profit or Loss_Details Of Financial Liabilities At Fair Value Through Profit Or Loss And Financial Liabilities Designated At Fair Value Through Profit Or Loss(Details) $ in Thousands, ₩ in Millions	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Disclosure Of Financial Liabilities Line Items [Line Items]
Financial liabilities at fair value through profit or loss	₩ 11,810,058	$ 10,873,722	₩ 15,368,153
Financial liabilities at fair value through profit or loss
Disclosure Of Financial Liabilities Line Items [Line Items]
Financial liabilities at fair value through profit or loss	2,025,951		2,663,327
Securities sold
Disclosure Of Financial Liabilities Line Items [Line Items]
Financial liabilities at fair value through profit or loss	1,934,735		2,583,092
Other
Disclosure Of Financial Liabilities Line Items [Line Items]
Financial liabilities at fair value through profit or loss	91,216		80,235
Financial liabilities designated at fair value through profit or loss
Disclosure Of Financial Liabilities Line Items [Line Items]
Financial liabilities at fair value through profit or loss	9,784,107		12,704,826
Derivative linked securities
Disclosure Of Financial Liabilities Line Items [Line Items]
Financial liabilities at fair value through profit or loss	₩ 9,784,107		₩ 12,704,826

Financial Liabilities at Fair_4

Financial Liabilities at Fair Value Through Profit or Loss_The Difference Between The Carrying Amount And Contractual Cash Flow Amount Of Financial Liabilities Designated At Fair Value Through Profit Or Loss(Details) $ in Thousands, ₩ in Millions	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Disclosure Of Financial Liabilities Line Items [Line Items]
Carrying amount	₩ 11,810,058	$ 10,873,722	₩ 15,368,153
Financial liabilities designated at fair value through profit or loss
Disclosure Of Financial Liabilities Line Items [Line Items]
Contractual cash flow amount	9,583,186		12,515,734
Carrying amount	9,784,107		12,704,826
Difference	(200,921)		(189,092)
Derivative linked securities
Disclosure Of Financial Liabilities Line Items [Line Items]
Carrying amount	₩ 9,784,107		₩ 12,704,826

Deposits_Details Of Deposits(De

Deposits_Details Of Deposits(Details) $ in Thousands, ₩ in Millions	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Disclosure Of Deposits From Customers Line Items [Line Items]
Deposits	₩ 338,580,220	$ 311,736,583	₩ 305,592,771
Demand deposits
Disclosure Of Deposits From Customers Line Items [Line Items]
Deposits	176,629,560		136,340,417
Demand deposits in Korean won
Disclosure Of Deposits From Customers Line Items [Line Items]
Deposits	162,155,728		127,790,349
Demand deposits in foreign currencies
Disclosure Of Deposits From Customers Line Items [Line Items]
Deposits	14,473,832		8,550,068
Time deposits
Disclosure Of Deposits From Customers Line Items [Line Items]
Deposits	159,481,736		165,012,385
Time Deposits In Korean Won
Disclosure Of Deposits From Customers Line Items [Line Items]
Deposits	149,435,968		157,653,603
Time deposits in foreign currencies
Disclosure Of Deposits From Customers Line Items [Line Items]
Deposits	10,045,768		7,358,782
Time deposits in foreign currencies
Disclosure Of Deposits From Customers Line Items [Line Items]
Deposits	10,043,679		7,377,173
Fair value adjustments on valuation of fair value hedged items
Disclosure Of Deposits From Customers Line Items [Line Items]
Fair value adjustments on valuation of fair value hedged items	2,089		(18,391)
Certificates of deposits
Disclosure Of Deposits From Customers Line Items [Line Items]
Deposits	₩ 2,468,924		₩ 4,239,969

Borrowings_Details of Borrowing

Borrowings_Details of Borrowings(Details) $ in Thousands, ₩ in Millions	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Borrowings Abstract [Abstract]
General Borrowings	₩ 32,312,859		₩ 24,370,567
Bonds sold under repurchase agreements and others	16,334,365		13,015,506
Call money	1,179,932		432,787
Total	₩ 49,827,156	$ 45,876,712	₩ 37,818,860

Borrowings_Details Of General B

Borrowings_Details Of General Borrowings(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	₩ 32,312,859	₩ 24,370,567
Borrowings in Korean won
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	21,197,871	14,429,984
The Bank of Korea
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	₩ 6,463,267	2,649,851
The Bank of Korea | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	0.25%
The Bank of Korea | Top Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	0.25%
SEMAS and others
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	₩ 2,675,568	1,658,810
SEMAS and others | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	0.00%
SEMAS and others | Top Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	2.70%
Shinhan Bank and others
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	₩ 137,952	116,160
Shinhan Bank and others | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	1.55%
Shinhan Bank and others | Top Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	3.01%
Korea Securities Finance Corporation and others
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	₩ 2,203,702	1,982,242
Korea Securities Finance Corporation and others | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	0.20%
Korea Securities Finance Corporation and others | Top Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	4.74%
The Korea Development Bank and others
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	₩ 9,717,382	8,022,921
The Korea Development Bank and others | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	0.00%
The Korea Development Bank and others | Top Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	5.20%
Borrowings in foreign currencies
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	₩ 11,114,988	9,940,583
Commonwealth Bank of Australia and others
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	292	4,682
Central Bank of Uzbekistan and others
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	₩ 9,839,110	8,089,368
Central Bank of Uzbekistan and others | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	0.00%
Central Bank of Uzbekistan and others | Top Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	8.84%
The Export-Import Bank of Korea and others
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	₩ 23,827	7,081
The Export-Import Bank of Korea and others | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	0.70%
The Export-Import Bank of Korea and others | Top Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	1.47%
Bank of New York Mellon and others
Disclosure Of Detailed Information About General Borrowings [Line Items]
General Borrowings	₩ 1,251,759	₩ 1,839,452
Bank of New York Mellon and others | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	0.00%
Bank of New York Mellon and others | Top Of Range Member [Member]
Disclosure Of Detailed Information About General Borrowings [Line Items]
Annual interest rate	2.80%

Borrowings_The Details Of Repur

Borrowings_The Details Of Repurchase Agreements And Others(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Detailed Information About Repurchase Agreements And Others Line Items [Line Items]
Repurchase Agreements And Others	₩ 16,334,365	₩ 13,015,506
Individuals, groups and corporations
Disclosure Of Detailed Information About Repurchase Agreements And Others Line Items [Line Items]
Repurchase Agreements And Others	₩ 16,329,799	13,011,121
Individuals, groups and corporations | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About Repurchase Agreements And Others Line Items [Line Items]
Annual interest rate	0.25%
Individuals, groups and corporations | Top Of Range Member [Member]
Disclosure Of Detailed Information About Repurchase Agreements And Others Line Items [Line Items]
Annual interest rate	3.00%
Counter sale
Disclosure Of Detailed Information About Repurchase Agreements And Others Line Items [Line Items]
Repurchase Agreements And Others	₩ 4,566	₩ 4,385
Counter sale | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About Repurchase Agreements And Others Line Items [Line Items]
Annual interest rate	0.10%
Counter sale | Top Of Range Member [Member]
Disclosure Of Detailed Information About Repurchase Agreements And Others Line Items [Line Items]
Annual interest rate	0.35%

Borrowings_The Details Of Call

Borrowings_The Details Of Call Money(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Detailed Information About Call Money Line Items [Line Items]
Call money	₩ 1,179,932	₩ 432,787
The Export-Import Bank of Korea and others
Disclosure Of Detailed Information About Call Money Line Items [Line Items]
Call money	₩ 510,000	165,000
The Export-Import Bank of Korea and others | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About Call Money Line Items [Line Items]
Annual interest rate	0.48%
The Export-Import Bank of Korea and others | Top Of Range Member [Member]
Disclosure Of Detailed Information About Call Money Line Items [Line Items]
Annual interest rate	0.85%
Central Bank of Uzbekistan and others
Disclosure Of Detailed Information About Call Money Line Items [Line Items]
Call money	₩ 669,932	₩ 267,787
Central Bank of Uzbekistan and others | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About Call Money Line Items [Line Items]
Annual interest rate	0.00%
Central Bank of Uzbekistan and others | Top Of Range Member [Member]
Disclosure Of Detailed Information About Call Money Line Items [Line Items]
Annual interest rate	0.34%

Debentures_Details Of Debenture

Debentures_Details Of Debentures(Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)		Dec. 31, 2019KRW (₩)	Dec. 31, 2020USD ($)
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	₩ 62,760,687		₩ 50,935,583	$ 57,784,835
Debentures in Korean won
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	55,442,162		45,587,696
Korean Won Gross Carrying Amount [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	55,495,986		45,596,655
Structured debentures
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	₩ 1,960		₩ 33,310
Structured debentures | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	5.65%		5.65%	5.65%
Structured debentures | Top Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	5.86%		5.86%	5.86%
Exchangeable bonds
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	₩ 240,000	[1]	₩ 0
Exchangeable bonds | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	0.00%	[1]	0.00%	0.00%	[1]
Exchangeable bonds | Top Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	0.00%	[1]	0.00%	0.00%	[1]
Subordinated fixed rate debentures
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	₩ 4,834,407		₩ 3,386,590
Subordinated fixed rate debentures | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	2.02%		2.02%	2.02%
Subordinated fixed rate debentures | Top Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	4.35%		4.35%	4.35%
Fixed rate debentures
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	₩ 47,229,619		₩ 40,596,755
Fixed rate debentures | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	0.00%		0.00%	0.00%
Fixed rate debentures | Top Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	3.50%		3.50%	3.50%
Floating rate debentures
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	₩ 3,190,000		₩ 1,580,000
Floating rate debentures | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	0.58%		0.58%	0.58%
Floating rate debentures | Top Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	1.55%		1.55%	1.55%
Fair value adjustments of fair value hedged debentures in Korean won
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Gains(losses) on the hedged items attributable to the hedged risk	₩ (6,839)		₩ 21,070
Less Discount on debentures in Korean won
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Discount On Debentures	(32,028)		(30,029)
Less Adjustment for exchangeable rights in Korean won
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Discount On Debentures	(14,957)		0
Debentures in foreign currencies
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	7,318,525		5,347,887
Foreign Currencies Gross Carrying Amount [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	7,263,518		5,321,803
Floating rate debentures
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	₩ 2,232,938		₩ 2,227,607
Floating rate debentures | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	0.58%		0.58%	0.58%
Floating rate debentures | Top Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	1.51%		1.51%	1.51%
Fixed rate debentures
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Debentures	₩ 5,030,580		₩ 3,094,196
Fixed rate debentures | Bottom Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	0.05%		0.05%	0.05%
Fixed rate debentures | Top Of Range Member [Member]
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Annual interest rate	13.50%		13.50%	13.50%
Fair value adjustments of fair value hedged debentures in foreign currencies
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Gains(losses) on the hedged items attributable to the hedged risk	₩ 81,333		₩ 41,406
Less Discount on debentures in foreign currencies
Disclosure Of Detailed Information About Deventures Line Items [Line Items]
Discount On Debentures	₩ (26,326)		₩ (15,322)
[1]	Fair value of the liability component of exchangeable bonds is calculated by using market interest rates of bonds under the same conditions without the exchangeable rights. The residual amount after deducting the liability component from the issuance amount, represents the value of the exchangeable rights and is recorded in equity. Shares to be exchanged are 5 million treasury shares of KB Financial Group Inc. with the exchange price of KRW 48,000. Exercise period for exchangeable rights is from the 60th day from the issuance date to 10 days before the maturity date.

Debentures_Changes In Debenture

Debentures_Changes In Debentures Based On Face Value(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation Of Changes In Debentures Based On Face Value Abstract [Abstract]
Beginning	₩ 50,918,458	₩ 53,331,253
Changes In Debentures Based On Face Value Abstract [Abstract]
Issues	119,810,529	93,657,911
Repayments	(107,760,800)	(96,145,669)
Business combination	277,087
Others	(485,770)	74,963
Ending	62,759,504	50,918,458
Debentures in Korean won
Reconciliation Of Changes In Debentures Based On Face Value Abstract [Abstract]
Beginning	45,596,655	48,588,134
Changes In Debentures Based On Face Value Abstract [Abstract]
Issues	116,077,084	92,530,041
Repayments	(106,147,753)	(95,521,520)
Business combination	0
Others	(30,000)	0
Ending	55,495,986	45,596,655
Structured debentures
Reconciliation Of Changes In Debentures Based On Face Value Abstract [Abstract]
Beginning	33,310	34,320
Changes In Debentures Based On Face Value Abstract [Abstract]
Issues	0	0
Repayments	(1,350)	(1,010)
Business combination	0
Others	(30,000)	0
Ending	1,960	33,310
Exchangeable bonds
Reconciliation Of Changes In Debentures Based On Face Value Abstract [Abstract]
Beginning	0
Changes In Debentures Based On Face Value Abstract [Abstract]
Issues	240,000
Repayments	0
Business combination	0
Others	0
Ending	240,000	0
Subordinated fixed rate debentures
Reconciliation Of Changes In Debentures Based On Face Value Abstract [Abstract]
Beginning	3,386,590	3,437,729
Changes In Debentures Based On Face Value Abstract [Abstract]
Issues	2,150,000	0
Repayments	(702,183)	(51,139)
Business combination	0
Others	0	0
Ending	4,834,407	3,386,590
Fixed rate debentures
Reconciliation Of Changes In Debentures Based On Face Value Abstract [Abstract]
Beginning	40,596,755	43,466,085
Changes In Debentures Based On Face Value Abstract [Abstract]
Issues	111,677,084	91,960,041
Repayments	(105,044,220)	(94,829,371)
Business combination	0
Others	0	0
Ending	47,229,619	40,596,755
Floating rate debentures
Reconciliation Of Changes In Debentures Based On Face Value Abstract [Abstract]
Beginning	1,580,000	1,650,000
Changes In Debentures Based On Face Value Abstract [Abstract]
Issues	2,010,000	570,000
Repayments	(400,000)	(640,000)
Business combination	0
Others	0	0
Ending	3,190,000	1,580,000
Debentures in foreign currencies
Reconciliation Of Changes In Debentures Based On Face Value Abstract [Abstract]
Beginning	5,321,803	4,743,119
Changes In Debentures Based On Face Value Abstract [Abstract]
Issues	3,733,445	1,127,870
Repayments	(1,613,047)	(624,149)
Business combination	277,087
Others	(455,770)	74,963
Ending	7,263,518	5,321,803
Floating rate debentures
Reconciliation Of Changes In Debentures Based On Face Value Abstract [Abstract]
Beginning	2,227,607	1,791,868
Changes In Debentures Based On Face Value Abstract [Abstract]
Issues	823,478	532,380
Repayments	(675,075)	(33,199)
Business combination	0
Others	(143,072)	(63,442)
Ending	2,232,938	2,227,607
Fixed rate debentures
Reconciliation Of Changes In Debentures Based On Face Value Abstract [Abstract]
Beginning	3,094,196	2,951,251
Changes In Debentures Based On Face Value Abstract [Abstract]
Issues	2,909,967	595,490
Repayments	(937,972)	(590,950)
Business combination	277,087
Others	(312,698)	138,405
Ending	₩ 5,030,580	₩ 3,094,196

Provisions_Details Of Provision

Provisions_Details Of Provisions(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)		Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		₩ 527,929
Transfer between stages [Abstract]
Ending		714,903		$ 658,223	₩ 527,929
Provisions for credit losses of unused loan commitments
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		208,148
Transfer between stages [Abstract]
Ending		298,753			208,148
Provisions for credit losses of unused loan commitments | 12-month expected credit losses
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		127,297			132,876
Transfer between stages [Abstract]
Transfer to 12-month expected credit losses		23,318			32,622
Transfer to lifetime expected credit losses		(13,431)			(16,932)
Impairment		(304)			(422)
Provision	[1]	24,583
Reversal					(21,171)
Business combination		19,426
Increase (decrease) in other provisions		(18,168)			324
Ending		162,721			127,297
Provisions for credit losses of unused loan commitments | Non-impaired
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		71,464			68,920
Transfer between stages [Abstract]
Transfer to 12-month expected credit losses		(21,694)			(31,408)
Transfer to lifetime expected credit losses		15,991			17,195
Impairment		(3,474)			(1,516)
Provision		65,449	[1]		18,036
Business combination		0
Increase (decrease) in other provisions		(273)			237
Ending		127,463			71,464
Provisions for credit losses of unused loan commitments | Impaired
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		9,387			8,881
Transfer between stages [Abstract]
Transfer to 12-month expected credit losses		(1,624)			(1,214)
Transfer to lifetime expected credit losses		(2,560)			(263)
Impairment		3,778			1,938
Provision					45
Reversal	[1]	(412)
Business combination		0
Increase (decrease) in other provisions		0			0
Ending		8,569			9,387
Provisions for credit losses of acceptances and guarantees
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		77,759
Transfer between stages [Abstract]
Ending		62,254			77,759
Provisions for credit losses of acceptances and guarantees | 12-month expected credit losses
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		24,961			27,084
Transfer between stages [Abstract]
Transfer to 12-month expected credit losses		194			365
Transfer to lifetime expected credit losses		(486)			(975)
Impairment		(5)			(24)
Provision	[1]	9,482
Reversal					(1,763)
Business combination		0
Increase (decrease) in other provisions		(1,058)			274
Ending		33,088			24,961
Provisions for credit losses of acceptances and guarantees | Non-impaired
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		36,012			30,109
Transfer between stages [Abstract]
Transfer to 12-month expected credit losses		(191)			(365)
Transfer to lifetime expected credit losses		486			1,705
Impairment		(461)			(280)
Provision					4,584
Reversal	[1]	(20,389)
Business combination		0
Increase (decrease) in other provisions		(619)			259
Ending		14,838			36,012
Provisions for credit losses of acceptances and guarantees | Impaired
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		16,786			17,982
Transfer between stages [Abstract]
Transfer to 12-month expected credit losses		(3)			0
Transfer to lifetime expected credit losses		0			(729)
Impairment		466			304
Reversal		(2,734)	[1]		(893)
Business combination		0
Increase (decrease) in other provisions		(187)			122
Ending		14,328			16,786
Provisions for credit losses of financial guarantee contracts
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		6,063			4,275
Transfer between stages [Abstract]
Provision		280			1,865
Increase (decrease) in other provisions		5			(77)
Ending		6,348			6,063
Provisions for restoration costs
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		120,340			108,000
Transfer between stages [Abstract]
Provision		14,192			7,037
Reversal		(2,010)			(7,178)
Used		(9,469)			(5,211)
Unwinding of discount		2,372			2,237
Effect of changes in discount rate		23,886			15,455
Business combination		2,385			0
Ending		₩ 151,696			₩ 120,340
Description Of Nature Of Provisions For Restoration Cost		Provisions for restoration costs are the present value of estimated costs to be incurred for the restoration of the leased properties. The expenditure of the restoration cost will be incurred at the end of each lease contract, and the lease period is used to reasonably estimate the time of expenditure. Also, the average restoration expense based on actual three-year historical data and three-year historical average inflation rate were used to estimate the present value of estimated costs.		Provisions for restoration costs are the present value of estimated costs to be incurred for the restoration of the leased properties. The expenditure of the restoration cost will be incurred at the end of each lease contract, and the lease period is used to reasonably estimate the time of expenditure. Also, the average restoration expense based on actual three-year historical data and three-year historical average inflation rate were used to estimate the present value of estimated costs.	Provisions for restoration cost are the present value of estimated costs to be incurred for the restoration of the leased properties. Actual expenses are expected to be incurred at the end of each lease contract. Three-year historical data of expired leases were used to estimate the average lease period. Also, the average restoration expense based on actual three-year historical data and the three-year historical average inflation rate were used to estimate the present value of estimated costs.
Other provisions
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		₩ 115,619			₩ 127,732
Transfer between stages [Abstract]
Provision		187,292			121,024
Decrease		(112,383)			(133,137)
Business combination		5,324
Ending		195,852			115,619
Membership rewards program
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		14,669			12,654
Transfer between stages [Abstract]
Provision		76,138			56,758
Decrease		(71,306)			(54,743)
Business combination		0
Ending		19,501			14,669
Dormant accounts
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		3,579			4,377
Transfer between stages [Abstract]
Provision		2,607			2,378
Decrease		(3,179)			(3,176)
Business combination		0
Ending		3,007			3,579
Litigations
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning		28,690			21,190
Transfer between stages [Abstract]
Provision		19,186			23,863
Decrease		(9,725)			(16,363)
Business combination		2,366
Ending		40,517			28,690
Others
Reconciliation Of Changes In Other Provisions Abstract [Abstract]
Beginning	[2]	68,681			89,511
Transfer between stages [Abstract]
Provision	[2]	89,361			38,025
Decrease	[2]	(28,173)			(58,855)
Business combination	[2]	2,958
Ending	[2]	132,827			68,681
Provision on incomplete sales on cardssurance		₩ 1,319			₩ 2,532
[1]	Includes additional provision of KRW 14,974 million for industries and borrowers which are highly affected by COVID-19, and KRW 28,385 million due to expanding the scope of the loans subject to lifetime expected credit losses (non-impaired) for the year ended December 31, 2020.
[2]	Provisions for incomplete sales of cardssurance are KRW 2,532 million and KRW 1,319 million, as of December 31, 2019 and 2020, respectively.

Net Defined Benefit Liabiliti_3

Net Defined Benefit Liabilities_Changes In The Net Defined Benefit Liabilities(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Disclosure Of Net Defined Benefit Liability Asset Line Items [Line Items]
Beginning	₩ 253,043	[1]	₩ 262,213
Changes In Net Defined Benefit Liability Asset Abstract [Abstract]
Current service cost	232,147		226,788		₩ 208,470
Past service cost	3,269		2,276
Gains on settlement	(1,912)		0		(1,000)
Interest expense (income)	4,743		5,545		3,833
Remeasurements
Actuarial gains and losses by changes in demographic assumptions	(9,611)		(3,122)
Actuarial gains and losses by changes in financial assumptions	789		61,547
Actuarial gains and losses by experience adjustments	16,292		7,458
Return on plan assets (excluding amounts included in interest income)	6,308		11,116		22,420
Contributions by the Group	(268,918)		(288,420)
Contributions by the employees	(248)
Payments from plans (settlement)	0
Payments from plans (benefit payments)	(3,922)		(22)
Payments from the Group	(34,361)		(32,556)
Transfer in	646		350
Transfer out	0		0
Effect of exchange differences	(719)		(2)
Effect of business acquisition and disposal	47,809
Others	26		(128)
Ending	₩ 245,381	[1]	₩ 253,043	[1]	262,213
Description of type of plan	The Group has the obligation to pay the agreed benefits to all its current and former employees.		The Group has the obligation to pay the agreed benefits to all its current and former employees.
Description of risks to which plan exposes entity	The Group assumes actuarial risk (that benefits will cost more than expected) and investment risk.		Actuarial risk (that benefits will cost more than expected) and investment risk fall, in substance, on the Group.
Description of significant actuarial assumptions made and method used to calculate actuarial present value of promised retirement benefits	The net defined benefit liability recognized in the consolidated statement of financial position is calculated by independent actuaries in accordance with actuarial valuation methods.		The defined benefit liability recognized in the statements of financial position is calculated by independent actuaries in accordance with actuarial valuation methods.
Present value of defined benefit obligation
Disclosure Of Net Defined Benefit Liability Asset Line Items [Line Items]
Beginning	₩ 2,341,753	[1]	₩ 2,172,260
Changes In Net Defined Benefit Liability Asset Abstract [Abstract]
Current service cost	232,147		226,788
Past service cost	3,269		2,276
Gains on settlement	(1,912)
Interest expense (income)	46,178		48,795
Remeasurements
Actuarial gains and losses by changes in demographic assumptions	(9,611)		(3,122)
Actuarial gains and losses by changes in financial assumptions	789		61,547
Actuarial gains and losses by experience adjustments	16,292		7,458
Return on plan assets (excluding amounts included in interest income)	0		0
Contributions by the Group	0		0
Contributions by the employees	0
Payments from plans (settlement)	(8,162)
Payments from plans (benefit payments)	(148,468)		(141,820)
Payments from the Group	(34,361)		(32,556)
Transfer in	9,673		7,775
Transfer out	(8,635)		(7,517)
Effect of exchange differences	(724)		(2)
Effect of business acquisition and disposal	110,080
Others	26		(129)
Ending	2,548,334	[1]	2,341,753	[1]	2,172,260
Fair value of plan assets
Disclosure Of Net Defined Benefit Liability Asset Line Items [Line Items]
Beginning	(2,088,710)	[1]	(1,910,047)
Changes In Net Defined Benefit Liability Asset Abstract [Abstract]
Current service cost	0		0
Past service cost	0		0
Gains on settlement	0
Interest expense (income)	(41,435)		(43,250)
Remeasurements
Actuarial gains and losses by changes in demographic assumptions	0		0
Actuarial gains and losses by changes in financial assumptions	0		0
Actuarial gains and losses by experience adjustments	0		0
Return on plan assets (excluding amounts included in interest income)	6,308		11,116
Contributions by the Group	(268,918)		(288,420)
Contributions by the employees	(248)
Payments from plans (settlement)	8,162
Payments from plans (benefit payments)	144,546		141,798
Payments from the Group	0		0
Transfer in	(9,027)		(7,425)
Transfer out	8,635		7,517
Effect of exchange differences	5		0
Effect of business acquisition and disposal	(62,271)
Others	0		1
Ending	₩ (2,302,953)	[1]	₩ (2,088,710)	[1]	₩ (1,910,047)
[1]	The net defined benefit liabilities of KRW 253,043 million is calculated by subtracting KRW 946 million net defined benefit assets from KRW 253,989 million net defined benefit liabilities as of December 31, 2019. The net defined benefit liabilities of KRW 245,381 million is calculated by subtracting KRW 2,845 million net defined benefit assets from KRW 248,226 million net defined benefit liabilities as of December 31, 2020.

Net Defined Benefit Liabiliti_4

Net Defined Benefit Liabilities_Details Of The Net Defined Benefit Liabilities(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Surplus Deficit In Plan Abstract [Abstract]
Present value of defined benefit obligation	₩ 2,548,334		₩ 2,341,753
Fair value of plan assets	(2,302,953)		(2,088,710)
Net defined benefit liabilities	₩ 245,381	[1]	₩ 253,043	[1]	₩ 262,213
[1]	The net defined benefit liabilities of KRW 253,043 million is calculated by subtracting KRW 946 million net defined benefit assets from KRW 253,989 million net defined benefit liabilities as of December 31, 2019. The net defined benefit liabilities of KRW 245,381 million is calculated by subtracting KRW 2,845 million net defined benefit assets from KRW 248,226 million net defined benefit liabilities as of December 31, 2020.

Net Defined Benefit Liabiliti_5

Net Defined Benefit Liabilities_Details Of Post-Employment Benefits Recognized In Profit Or Loss(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Details Of Postemployment Benefits Recognized In Profit Or Loss Abstract [Abstract]
Current service cost		₩ 232,147	₩ 226,788	₩ 208,470
Past service cost		3,269	2,276	7,912
Net interest expenses of net defined benefit liabilities		4,743	5,545	3,833
Gains on settlement		(1,912)	0	(1,000)
Post-employment benefits	[1]	238,247	234,609	₩ 219,215
Postemployment Benefit Expense Defined Benefit Plans Recognized As Other Operating Expense		2,840	2,575
Postemployment Benefit Expense Defined Benefit Plans Recognized As Prepayments		₩ 176	₩ 121
[1]	Includes post-employment benefits amounting to KRW 2,575 million recognized as other operating expense and KRW 121 million recognized as prepayment for the year ended December 31, 2019 and post-employment benefits amounting to KRW 2,840 million recognized as other operating expense and KRW 176 million recognized as prepayment for the year ended December 31, 2020.

Net Defined Benefit Liabiliti_6

Net Defined Benefit Liabilities_Remeasurements Of The Net Defined Benefit Liabilities Recognized As Other Comprehensive Income(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Remeasurement Of Net Defined Benefit Liability Asset Recognized As Other Comprehensive Income Abstract [Abstract]
Return on plan assets (excluding amounts included in interest income)		₩ (6,308)		₩ (11,116)	₩ (22,420)
Actuarial gains and losses		(7,470)		(65,883)	(167,973)
Income tax effects		3,792		21,172	52,377
Effect of exchange difference		(399)		0	0
Remeasurements after income tax	[1],[2]	₩ (10,385)	$ (9,561)	₩ (55,827)	₩ (138,016)
[1]	The consolidated statements of changes in equity for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Net Defined Benefit Liabiliti_7

Net Defined Benefit Liabilities_The Details Of Fair Value Of Plan Assets(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Details Of Fair Value Of Plan Assests Abstract [Abstract]
Cash and due from financial institutions	₩ 2,299,500	₩ 2,087,861
Derivative instruments	1,930
Investment fund	1,523	849
Total	2,302,953	2,088,710
Assets quoted in an active market
Details Of Fair Value Of Plan Assests Abstract [Abstract]
Cash and due from financial institutions	0	0
Derivative instruments	0
Investment fund	0	0
Total	0	0
Assets not quoted in an active market
Details Of Fair Value Of Plan Assests Abstract [Abstract]
Cash and due from financial institutions	2,299,500	2,087,861
Derivative instruments	1,930
Investment fund	1,523	849
Total	₩ 2,302,953	₩ 2,088,710

Net Defined Benefit Liabiliti_8

Net Defined Benefit Liabilities_Key Actuarial Assumptions(Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Actuarial Assumptions Line Items [Line Items]
Description Of Actuarial Assumption Of Mortality Rates	Mortality assumptions are based on the experience-based mortality table issued by Korea Insurance Development Institute in 2019.
Bottom Of Range Member [Member]
Disclosure Of Actuarial Assumptions Line Items [Line Items]
Discount rate	0.90%	1.60%
Salary increase rate	0.00%	0.00%
Turnover	0.00%	0.00%
Top Of Range Member [Member]
Disclosure Of Actuarial Assumptions Line Items [Line Items]
Discount rate	2.00%	2.00%
Salary increase rate	7.50%	7.50%
Turnover	50.00%	50.00%

Net Defined Benefit Liabiliti_9

Net Defined Benefit Liabilities_The Sensitivity Of The Defined Benefit Obligation To Changes In The Weighted Principal Assumptions(Details) - Weighted Average Member [Member]	12 Months Ended
	Dec. 31, 2020
Effect on net defined benefit obligation
Description Of Methods And Assumptions Used In Preparing Sensitivity Analysis For Actuarial Assumptions	The above sensitivity analyses are based on a change in an assumption while holding all other assumptions constant. In practice, this is unlikely to occur, and changes in some of the assumptions may be correlated. The sensitivity of the defined benefit obligation to changes in principal actuarial assumptions is calculated using the same projected unit credit method used in calculating the defined benefit obligations recognized in the consolidated statement of financial position.
Discount rate
Disclosure Of Sensitivity Analysis For Actuarial Assumptions Line Items [Line Items]
Changes In Principal Assumption	0.5 p.
Effect on net defined benefit obligation
Increase in principal assumption	(4.34%)
Decrease in principal assumption	4.12%
Salary increase rate
Disclosure Of Sensitivity Analysis For Actuarial Assumptions Line Items [Line Items]
Changes In Principal Assumption	0.5 p.
Effect on net defined benefit obligation
Increase in principal assumption	1.41%
Decrease in principal assumption	(6.41%)
Turnover
Disclosure Of Sensitivity Analysis For Actuarial Assumptions Line Items [Line Items]
Changes In Principal Assumption	0.5 p.
Effect on net defined benefit obligation
Increase in principal assumption	(0.94%)
Decrease in principal assumption	0.39%

Net Defined Benefit Liabilit_10

Net Defined Benefit Liabilities_Expected Maturity Analysis Of Undiscounted Pension Benefits Including Expected Future Benefit(Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)
Disclosure Of Expected Maturity Analysis Line Items [Line Items]
Pension benefits	₩ 6,232,033	[1]
Description of undiscounted pension benefits including expected future benefits	Amount determined under the promotion compensation type defined contribution plan is excluded.
Expected contribution to plan assets [Abstract]
Expected contribution to plan assets	₩ 221,271
Bottom Of Range Member [Member]
Disclosure Of Weighted Average Duration Of Defined Benefit Obligation Line Items [Line Items]
Weighted Average Duration Of Defined Benefit Obligation	1 year
Top Of Range Member [Member]
Disclosure Of Weighted Average Duration Of Defined Benefit Obligation Line Items [Line Items]
Weighted Average Duration Of Defined Benefit Obligation	11 years 6 months
Up to 1 year
Disclosure Of Expected Maturity Analysis Line Items [Line Items]
Pension benefits	₩ 98,050	[1]
2 years
Disclosure Of Expected Maturity Analysis Line Items [Line Items]
Pension benefits	182,432	[1]
2~5 years
Disclosure Of Expected Maturity Analysis Line Items [Line Items]
Pension benefits	706,187	[1]
5~10 years
Disclosure Of Expected Maturity Analysis Line Items [Line Items]
Pension benefits	1,415,615	[1]
Over 10 years
Disclosure Of Expected Maturity Analysis Line Items [Line Items]
Pension benefits	₩ 3,829,749	[1]
[1]	Amount determined under the promotion compensation type defined contribution plan is excluded.

Other Liabilities_Details Of Ot

Other Liabilities_Details Of Other Liabilities(Details) $ in Thousands, ₩ in Millions	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Other Liabilities Line Items [Line Items]
Other Liabilities	₩ 41,804,023	$ 38,489,677	₩ 29,737,259
Other financial liabilities
Other Liabilities Line Items [Line Items]
Other Liabilities	28,612,288		22,629,587
Other payables
Other Liabilities Line Items [Line Items]
Other Liabilities	14,247,067		9,485,597
Prepaid card and debit card payables
Other Liabilities Line Items [Line Items]
Other Liabilities	31,184		27,555
Accrued expenses
Other Liabilities Line Items [Line Items]
Other Liabilities	2,787,360		3,066,445
Financial guarantee contracts
Other Liabilities Line Items [Line Items]
Other Liabilities	49,286		46,428
Deposits for letter of guarantees and others
Other Liabilities Line Items [Line Items]
Other Liabilities	1,103,876		862,968
Domestic exchange settlement credits
Other Liabilities Line Items [Line Items]
Other Liabilities	938,039		2,079,636
Foreign exchanges settlement credits
Other Liabilities Line Items [Line Items]
Other Liabilities	134,678		114,316
Borrowings from other business accounts
Other Liabilities Line Items [Line Items]
Other Liabilities	0		256
Due to trust accounts
Other Liabilities Line Items [Line Items]
Other Liabilities	7,542,955		5,216,460
Liability incurred from agency relationships
Other Liabilities Line Items [Line Items]
Other Liabilities	765,844		771,609
Account for agency businesses
Other Liabilities Line Items [Line Items]
Other Liabilities	400,507		407,475
Dividend payables
Other Liabilities Line Items [Line Items]
Other Liabilities	478		473
Lease liabilities
Other Liabilities Line Items [Line Items]
Other Liabilities	559,113		544,439
Others
Other Liabilities Line Items [Line Items]
Other Liabilities	51,901		5,930
Other non-financial liabilities
Other Liabilities Line Items [Line Items]
Other Liabilities	13,191,735		7,107,672
Other payables
Other Liabilities Line Items [Line Items]
Other Liabilities	386,094		283,771
Unearned revenue
Other Liabilities Line Items [Line Items]
Other Liabilities	669,908		465,501
Accrued expenses
Other Liabilities Line Items [Line Items]
Other Liabilities	815,941		716,180
Deferred revenue on credit card points
Other Liabilities Line Items [Line Items]
Other Liabilities	211,815		206,188
Withholding taxes
Other Liabilities Line Items [Line Items]
Other Liabilities	180,092		158,992
Separate account liabilities
Other Liabilities Line Items [Line Items]
Other Liabilities	10,701,404		5,047,080
Others
Other Liabilities Line Items [Line Items]
Other Liabilities	₩ 226,481		₩ 229,960

Equity_Share Capital(Details)

Equity_Share Capital(Details) ₩ / shares in Units, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)₩ / sharesshares	Dec. 31, 2019KRW (₩)₩ / sharesshares	Dec. 31, 2020USD ($)shares	Dec. 31, 2018shares
Type of share
Number of authorized shares	1,000,000,000	1,000,000,000	1,000,000,000
Share capital	₩ 2,090,558	₩ 2,090,558	$ 1,924,812
Ordinary shares
Type of share
Number of authorized shares	1,000,000,000	1,000,000,000	1,000,000,000
Par value per share | ₩ / shares	₩ 5,000	₩ 5,000
Number of issued shares	415,807,920	415,807,920	415,807,920	418,111,537
Share capital | ₩	₩ 2,090,558	₩ 2,090,558
Reconciliation Of Number Of Shares Outstanding Abstract [Abstract]
Beginning	389,634,335	395,551,297
Changes In Number Of Shares Outstanding Abstract [Abstract]
Increase	0	0
Decrease	0	(5,916,962)
Ending	389,634,335	389,634,335

Equity_Hybrid Securities(Detail

Equity_Hybrid Securities(Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)	Dec. 31, 2019KRW (₩)	Dec. 31, 2020USD ($)
Hybrid Instruments
Hybrid securities	₩ 1,695,988	₩ 399,205	$ 1,561,525
Discription Of Detailed Information About Hybrid Securities Explanatory	On the other hand, hybrid securities of KRW 574,580 million issued by Kookmin Bank are recognized as non-controlling interests and are early redeemable after 5 years from the issuance date and each interest payment date thereafter.	On the other hand, hybrid securities of KRW 574,580 million issued by Kookmin Bank are recognized as non-controlling interests and are early redeemable after 5 years from the issuance date and each interest payment date thereafter.
Hybrid Instrument
Hybrid Instruments
Hybrid securities	₩ 1,695,988	₩ 399,205
Discription Of Detailed Information About Hybrid Securities Explanatory	The above hybrid securities are early redeemable by the Group after 5 or 10 years from the issuance date.	The above hybrid securities are early redeemable by the Group after 5 or 10 years from the issuance date.
The 1-1st Hybrid Securities
Hybrid Instruments
Issuance date	May 2, 2019	May 2, 2019
Maturity	Perpetual bond	Perpetual bond
Interest Rate	3.23%	3.23%	3.23%
Hybrid securities	₩ 349,309	₩ 349,309
The 1-2nd Hybrid securities
Hybrid Instruments
Issuance date	May 2, 2019	May 2, 2019
Maturity	Perpetual bond	Perpetual bond
Interest Rate	3.44%	3.44%	3.44%
Hybrid securities	₩ 49,896	₩ 49,896
The 2-1st Hybrid securities
Hybrid Instruments
Issuance date	May 8, 2020
Maturity	Perpetual bond
Interest Rate	3.30%		3.30%
Hybrid securities	₩ 324,099	0
The 2-2nd Hybrid securities
Hybrid Instruments
Issuance date	May 8, 2020
Maturity	Perpetual bond
Interest Rate	3.43%		3.43%
Hybrid securities	₩ 74,812	0
The 3-1st Hybrid securities
Hybrid Instruments
Issuance date	Jul. 14, 2020
Maturity	Perpetual bond
Interest Rate	3.17%		3.17%
Hybrid securities	₩ 369,099	0
The 3-2nd Hybrid securities
Hybrid Instruments
Issuance date	Jul. 14, 2020
Maturity	Perpetual bond
Interest Rate	3.38%		3.38%
Hybrid securities	₩ 29,922	0
The 4-1st Hybrid securities
Hybrid Instruments
Issuance date	Oct. 20, 2020
Maturity	Perpetual bond
Interest Rate	3.00%		3.00%
Hybrid securities	₩ 433,996	0
The 4-2nd Hybrid securities
Hybrid Instruments
Issuance date	Oct. 20, 2020
Maturity	Perpetual bond
Interest Rate	3.28%		3.28%
Hybrid securities	₩ 64,855	₩ 0

Equity_Capital Surplus(Details)

Equity_Capital Surplus(Details) $ in Thousands, ₩ in Millions	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Miscellaneous Equity Abstract [Abstract]
Paid-in capital in excess of par value	₩ 13,190,274		₩ 13,190,274
Loss On Sales Of Treasury Shares	(481,332)		(481,332)
Other capital surplus	4,002,714		4,413,835
Consideration for exchangeable rights	11,933		0
Total	₩ 16,723,589	$ 15,397,693	₩ 17,122,777

Equity_Accumulated Other Compre

Equity_Accumulated Other Comprehensive Income(Details) $ in Thousands, ₩ in Millions	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Other Reserves Abstract [Abstract]
Remeasurements of net defined benefit liabilities	₩ (300,324)		₩ (290,228)
Exchange differences on translating foreign operations	(131,113)		31,793
Net gains on financial instruments at fair value through other comprehensive income	717,230		487,331
Share of other comprehensive income (loss) of associates and joint ventures	(3,529)		3,318
Cash flow hedges	(28,597)		(27,333)
Gains (losses) on hedging instruments of net investments in foreign operations	22,277		(41,992)
Other comprehensive income arising from separate account	8,698		18,381
Fair value changes on financial liabilities designated at fair value due to own credit risk	(11,507)		(20,326)
Net gains on overlay approach adjustment	339,202		187,077
Total	₩ 612,337	$ 563,789	₩ 348,021	₩ 177,806

Equity_Retained Earnings(Detail

Equity_Retained Earnings(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)		Dec. 31, 2019KRW (₩)	Dec. 31, 2020USD ($)
Retained Earnings Accumulated Deficit Abstract [Abstract]
Legal reserves	[2]	₩ 557,405	[1]	₩ 482,807
Voluntary reserves		982,000	[1]	982,000
Unappropriated retained earnings		20,977,987	[1]	18,244,738
Total		22,517,392	[1]	₩ 19,709,545	$ 20,732,148
Retained Earnings Restricted For Dividend At Subsidiaries Level Pursuant To Law And Regulations		₩ 3,587,439
Description Of Nature And Purpose Of Legal Reserves Within Equity		With respect to the allocation of net profit earned in a fiscal term, the Parent Company must set aside in its legal reserve an amount equal to at least 10% of its profit after tax as reported in the financial statements, each time it pays dividends on its net profits earned until its legal reserve reaches at least the aggregate amount of its paid-in capital in accordance with Article 53 of the Financial Holding Company Act. This reserve is not available for the payment of cash dividends, but may be transferred to share capital, or used to reduce accumulated deficit.		With respect to the allocation of net profit earned in a fiscal term, the Parent Company must set aside in its legal reserve an amount equal to at least 10% of its profit after tax as reported in the financial statements, each time it pays dividends on its net profits earned until its legal reserve reaches at least the aggregate amount of its paid-in capital in accordance with Article 53 of the Financial Holding Company Act. This reserve is not available for the payment of cash dividends, but may be transferred to share capital, or used to reduce accumulated deficit.
[1]	Retained earnings restricted for dividend at subsidiaries level pursuant to law and regulations amounts to KRW 3,587,439 million as of December 31, 2020.
[2]	With respect to the allocation of net profit earned in a fiscal term, the Parent Company must set aside in its legal reserve an amount equal to at least 10% of its profit after tax as reported in the financial statements, each time it pays dividends on its net profits earned until its legal reserve reaches at least the aggregate amount of its paid-in capital in accordance with Article 53 of the Financial Holding Company Act. This reserve is not available for the payment of cash dividends, but may be transferred to share capital, or used to reduce accumulated deficit.

Equity_Treasury Shares(Details)

Equity_Treasury Shares(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)shares		Dec. 31, 2020USD ($)shares		Dec. 31, 2019KRW (₩)shares
Carrying amount
Beginning		₩ 1,136,188				₩ 968,549
Changes In Treasury Share Amount Abstract [Abstract]
Acquisition		0				267,639
Retirement		0				(100,000)
Ending		₩ 1,136,188		$ 1,046,108		₩ 1,136,188
Treasury Shares Member [Member]
Number of treasury shares
Beginning | shares		26,173,585	[1]	26,173,585	[1]	22,560,240
Changes In Treasury Share Number Abstract [Abstract]
Acquisition | shares		0		0		5,916,962
Retirement | shares		0		0		(2,303,617)
Ending | shares	[1]	26,173,585		26,173,585		26,173,585
Deposited at the Korea Securities Depository for issuing exchangeable bonds		₩ 5
Carrying amount
Beginning		1,136,188				₩ 968,549
Changes In Treasury Share Amount Abstract [Abstract]
Acquisition		0				267,639
Retirement		0				(100,000)
Ending		₩ 1,136,188				₩ 1,136,188
[1]	5,000,000 treasury shares are deposited at the Korea Securities Depository for issuing exchangeable bonds.

Net Interest Income_Details Of

Net Interest Income_Details Of Interest Income And Interest Expense(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Interest income
Due from financial institutions measured at fair value through profit or loss		₩ 649		₩ 2,685	₩ 9,236
Securities measured at fair value through profit or loss		647,840		668,377	713,058
Loans measured at fair value through profit or loss		10,876		33,001	26,066
Securities measured at fair value through other comprehensive income		719,434		774,864	718,327
Loans measured at fair value through other comprehensive income		7,899		14,708	2,373
Due from financial institutions measured at amortized cost		92,155		150,635	109,155
Securities measured at amortized cost		627,201		599,519	604,709
Loans measured at amortized cost		12,177,822		12,247,493	11,431,359
Other		201,871		147,905	120,286
Sub-total	[1]	14,485,747	$ 13,337,275	14,639,187	13,734,569
Interest expenses
Deposits		2,916,794		3,481,121	3,041,739
Borrowings		572,946		596,425	544,562
Debentures		1,186,310		1,240,566	1,148,729
Other		87,423		124,288	94,611
Sub-total	[1]	4,763,473	4,385,812	5,442,400	4,829,641
Net interest income	[1]	₩ 9,722,274	$ 8,951,463	₩ 9,196,787	₩ 8,904,928
[1]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Net Interest Income_Interest In

Net Interest Income_Interest Income Recognized On Impaired Loans(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans And Receivables Category [Member]
Disclosure Of Financial Instruments Line Items [Line Items]
Interest income recognized on impaired loans	₩ 56,606	₩ 54,033	₩ 48,974

Net Fee and Commission Income_D

Net Fee and Commission Income_Details Of Fee And Commission Income And Fee And Commission Expense(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Fee and commission income
Banking activity fees		₩ 189,100		₩ 214,512	₩ 208,443
Lending activity fees		91,663		83,916	74,340
Credit card and debit card related fees		1,378,450		1,316,636	1,360,515
Agent activity fees		196,518		172,211	149,585
Trust and other fiduciary fees		331,827		388,352	363,767
Fund management related fees		154,612		153,798	132,657
Acceptances and guarantees fees		54,108		48,122	44,104
Foreign currency related fees		173,313		134,145	124,201
Securities agency fees		172,097		145,846	167,071
Other business account commission on consignment		40,461		36,813	36,947
Commissions received on securities business		793,278		445,987	518,309
Lease fees		636,301		428,195	246,537
Others		315,296		310,714	291,244
Sub-total	[1]	4,527,024	$ 4,168,109	3,879,247	3,717,720
Fee and commission expense
Trading activity related fees	[2]	38,497		28,869	31,889
Lending activity fees		33,444		26,040	25,734
Credit card and debit card related fees		848,823		892,391	907,831
Outsourcing related fees		216,962		190,312	164,594
Foreign currency related fees		49,435		42,902	43,053
Other		380,924		343,729	301,243
Sub-total	[1]	1,568,085	1,443,763	1,524,243	1,474,344
Net fee and commission income	[1]	₩ 2,958,939	$ 2,724,346	₩ 2,355,004	₩ 2,243,376
[1]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	Fees from financial instruments at fair value through profit or loss.

Net Gains or Losses on Financ_3

Net Gains or Losses on Financial Instruments at Fair Value through Profit or Loss(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	₩ 16,869,982	₩ 12,914,689	₩ 9,805,428
Losses on financial instruments at fair value through profit or loss	15,369,373	10,872,846	9,361,056
Net gains on financial instruments at fair value through profit or loss	1,500,609	2,041,843	444,372
Financial assets at fair value through profit or loss
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	2,786,577	2,042,592	2,116,296
Losses on financial instruments at fair value through profit or loss	1,484,839	1,068,742	1,326,097
Debt securities
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	2,061,505	1,613,946	1,544,892
Losses on financial instruments at fair value through profit or loss	1,040,285	752,999	850,129
Equity securities
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	725,072	428,646	571,404
Losses on financial instruments at fair value through profit or loss	444,554	315,743	475,968
Derivatives held for trading
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	14,054,556	10,819,536	7,616,700
Losses on financial instruments at fair value through profit or loss	13,731,191	9,703,974	7,900,612
Interest rate
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	2,632,246	2,685,998	2,328,576
Losses on financial instruments at fair value through profit or loss	2,687,114	2,758,205	2,610,305
Currency
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	8,335,594	5,251,597	3,764,985
Losses on financial instruments at fair value through profit or loss	8,191,456	5,118,095	3,499,356
Stock or stock index
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	2,808,284	2,612,422	1,383,446
Losses on financial instruments at fair value through profit or loss	2,558,205	1,585,086	1,626,007
Credit
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	28,434	41,548	38,461
Losses on financial instruments at fair value through profit or loss	19,213	42,172	36,747
Commodity
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	18,097	15,240	8,285
Losses on financial instruments at fair value through profit or loss	21,797	9,437	10,456
Other
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	231,901	212,731	92,947
Losses on financial instruments at fair value through profit or loss	253,406	190,979	117,741
Financial liabilties held for trading
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	28,160	46,750	72,410
Losses on financial instruments at fair value through profit or loss	153,227	94,426	134,287
Other financial instruments
Gains losses on financial instruments at fair value through profit or loss Abstract [Abstract]
Gains on financial instruments at fair value through profit or loss	689	5,811	22
Losses on financial instruments at fair value through profit or loss	₩ 116	₩ 5,704	₩ 60

Net Gains or Losses on Financ_4

Net Gains or Losses on Financial Instruments at Fair Value through Profit or Loss Net Gains or Losses on Financial Instruments Designated at Fair Value through Profit or Loss(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net gains or losses on financial instruments held for trading [Line Items]
Gains on financial instruments designated at fair value through profit or loss	₩ 654,045	₩ 555,749	₩ 667,508
Losses on financial instruments designated at fair value through profit or loss	1,143,288	1,953,720	760,577
Net losses on financial instruments designated at fair value through profit or loss	(489,243)	(1,397,971)	(93,069)
Financial liabilities designated at fair value through profit or loss
Net gains or losses on financial instruments held for trading [Line Items]
Gains on financial instruments designated at fair value through profit or loss	654,045	555,749	667,508
Losses on financial instruments designated at fair value through profit or loss	₩ 1,143,288	₩ 1,953,720	₩ 760,577

Net Other Operating Income an_3

Net Other Operating Income and Expenses_Details Of Other Operating Income And Expenses(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Gains related to financial instruments at fair value through other comprehensive income
Gains on redemption of financial instruments at fair value through other comprehensive income		₩ 351		₩ 796	₩ 259
Gains on disposal of financial instruments at fair value through other comprehensive income		304,217		222,371	134,875
Sub-total		304,568		223,167	135,134
Gains related to financial assets at amortized cost
Gains on sale of loans measured at amortized cost		180,038		80,746	46,877
Gains on disposal of securities measured at amortized cost		229		0	0
Sub-total		180,267		80,746	46,877
Gain on foreign exchange transactions		3,634,987		2,183,703	1,600,161
Dividend income		45,125		54,768	83,930
Others		591,798		321,244	260,709
Total other operating income		4,756,745		2,863,628	2,126,811
Losses related to financial instruments at fair value through other comprehensive income
Losses on redemption of financial instruments at fair value through other comprehensive income		320		0	17
Losses on disposal of financial instruments at fair value through other comprehensive income		19,159		16,975	35,864
Sub-total		19,479		16,975	35,881
Losses related to financial assets at amortized cost
Losses on sale of loans measured at amortized cost		16,061		19,439	9,006
Losses on disposal of securities measured at amortized cost		6,513		0	0
Sub-total		22,574		19,439	9,006
Loss on foreign exchanges transactions		3,530,618		1,970,294	1,539,837
Others		2,684,004		1,920,244	1,672,123
Total other operating expenses		6,256,675		3,926,952	3,256,847
Net other operating expenses	[1]	₩ (1,499,930)	$ (1,381,011)	₩ (1,063,324)	₩ (1,130,036)
[1]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

General and Administrative Ex_3

General and Administrative Expenses_Details Of General And Administrative Expenses(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Employee Benefits
Salaries and short-term employee benefits - salaries		₩ 2,789,201		₩ 2,557,821	₩ 2,512,945
Salaries and short-term employee benefits - others		871,014		848,421	870,356
Post-employment benefits - defined benefit plans		235,231		231,913	217,085
Post-employment benefits - defined contribution plans		37,328		27,924	21,056
Termination benefits		361,098		239,790	242,010
Share-based payments		49,364		49,418	10,930
Sub-total		4,343,236		3,955,287	3,874,382
Depreciation and amortization		874,911		784,431	408,771
Other general and administrative expenses
Rental expense		116,325		109,745	361,344
Tax and dues		260,071		238,670	214,683
Communication		53,596		48,749	46,661
Electricity and utilities		32,298		29,161	28,823
Publication		13,988		15,136	16,018
Repairs and maintenance		32,448		23,947	22,432
Vehicle		14,314		11,537	12,495
Travel		12,251		21,452	19,393
Training		27,610		31,451	30,310
Service fees		238,787		227,631	210,081
Electronic data processing expenses		280,773		258,456	189,007
Advertising		236,618		228,826	217,244
Others		295,926		286,538	266,868
Sub-total		1,615,005		1,531,299	1,635,359
Total	[1]	₩ 6,833,152	$ 6,291,399	₩ 6,271,017	₩ 5,918,512
[1]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

General and Administrative Ex_4

General and Administrative Expenses_Details Of Stock Grants Linked To Longterm And Shortterm Performance(Details)	12 Months Ended
	Dec. 31, 2020shares
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Granted in 2020
Number of granted shares	16,800
Description Of Method Of Settlement For Sharebased Payment Arrangement	Cash-settled
Linked to long term performance
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	1,713,368	[1]
Linked to short-term performance
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	1,871,589	[2]
KB Financial Group Inc. | Linked to long term performance
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	257,137	[1]
KB Financial Group Inc. | Series 21
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Jan. 01, 2019
Number of granted shares	25,172	[1]
Vesting conditions	Services fulfillment, market performance 0~30% and non-market performance 70~100%	[2],[3],[4]
KB Financial Group Inc. | Series 22
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Apr. 01, 2019
Number of granted shares	3,226	[1]
Vesting conditions	Services fulfillment, market performance 30% and non-market performance 70%	[2],[3],[4]
KB Financial Group Inc. | Series 23
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	May. 27, 2019
Number of granted shares	1,436	[1]
Vesting conditions	Services fulfillment, market performance 30% and non-market performance 70%	[2],[3],[4]
KB Financial Group Inc. | Series 24
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Jul. 17, 2019
Number of granted shares	8,195	[1]
Vesting conditions	Services fulfillment, market performance 30% and non-market performance 70%	[2],[3],[4]
KB Financial Group Inc. | Series 25
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Jan. 01, 2020
Number of granted shares	57,367	[1]
Vesting conditions	Services fulfillment, market performance 0~30% and non-market performance 70%~100%	[2],[3],[4]
KB Financial Group Inc. | Series 26
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Mar. 18, 2020
Number of granted shares	430	[1]
Vesting conditions	Services fulfillment, market performance 30% and non-market performance 70%	[2],[3],[4]
KB Financial Group Inc. | Series 27
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Jun. 15, 2020
Number of granted shares	187	[1]
Vesting conditions	Services fulfillment, market performance 30% and non-market performance 70%	[2],[3],[4]
KB Financial Group Inc. | Series 28
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Nov. 21, 2020
Number of granted shares	68,135	[1]
Vesting conditions	Services fulfillment, market performance 35% and non-market performance 65%	[2],[4],[5]
KB Financial Group Inc. | Deferred grant in 2015
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	7,674	[1]
Vesting conditions	Satisfied	[2]
KB Financial Group Inc. | Deferred grant in 2016
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	8,705	[1]
Vesting conditions	Satisfied	[2]
KB Financial Group Inc. | Deferred grant in 2017
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	17,983	[1]
Vesting conditions	Satisfied	[2]
KB Financial Group Inc. | Deferred Grant In 2018
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	5,960	[1]
Vesting conditions	Satisfied	[2]
KB Financial Group Inc. | Deferred Grant In 2019
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	24,533	[1]
Vesting conditions	Satisfied	[2]
KB Financial Group Inc. | Deferred Grant In 2020
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	28,134	[1]
Vesting conditions	Satisfied	[2]
KB Financial Group Inc. | Stock granted in 2015
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	7,524	[2]
Vesting conditions	Satisfied
KB Financial Group Inc. | Stock granted in 2016
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	6,595	[2]
Vesting conditions	Satisfied
KB Financial Group Inc. | Stock granted in 2017
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	7,385	[2]
Vesting conditions	Satisfied
KB Financial Group Inc. | Stock granted in 2018
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	14,292	[2]
Vesting conditions	Satisfied
KB Financial Group Inc. | Stock granted in 2019
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	28,030	[2]
Vesting conditions	Satisfied
KB Financial Group Inc. | Stock granted in 2020
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	37,300	[2]
Vesting conditions	Proportional to service period
Kookmin Bank | Linked to long term performance
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	684,046	[1]
Kookmin Bank | Series 75
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Jan. 01, 2019
Number of granted shares	154,996	[1]
Vesting conditions	Services fulfillment, market performance 0~50% and non-market performance 50~100%	[2],[3],[4]
Kookmin Bank | Series 76
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Apr. 01, 2019
Number of granted shares	5,380	[1]
Vesting conditions	Services fulfillment, market performance 30~50% and non-market performance 50~70%	[2],[3],[4]
Kookmin Bank | Series 77
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	May. 27, 2019
Number of granted shares	4,468	[1]
Vesting conditions	Services fulfillment, market performance 30~50% and non-market performance 50~70%	[2],[3],[4]
Kookmin Bank | Series 78
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Nov. 21, 2019
Number of granted shares	36,443	[1]
Vesting conditions	Services fulfillment, market performance 30% and non-market performance 70%	[2],[4],[6]
Kookmin Bank | Series 79
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Jan. 01, 2020
Number of granted shares	241,609	[1]
Vesting conditions	Services fulfillment, market performance 0~50% and non-market performance 50~100%	[2],[3],[4]
Kookmin Bank | Series 80
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Mar. 01, 2020
Number of granted shares	7,711	[1]
Vesting conditions	Services fulfillment, market performance 30~50% and non-market performance 50~70%	[2],[3],[4]
Kookmin Bank | Deferred grant in 2015
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	2,759	[1]
Vesting conditions	Satisfied	[2]
Kookmin Bank | Deferred grant in 2016
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	19,109	[1]
Vesting conditions	Satisfied	[2]
Kookmin Bank | Deferred grant in 2017
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	47,863	[1]
Vesting conditions	Satisfied	[2]
Kookmin Bank | Deferred Grant In 2018
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	65,514	[1]
Vesting conditions	Satisfied	[2]
Kookmin Bank | Deferred Grant In 2019
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	98,194	[1]
Vesting conditions	Satisfied	[2]
Kookmin Bank | Stock granted in 2015
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	9,887	[2]
Vesting conditions	Satisfied
Kookmin Bank | Stock granted in 2016
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	19,662	[2]
Vesting conditions	Satisfied
Kookmin Bank | Stock granted in 2017
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	30,003	[2]
Vesting conditions	Satisfied
Kookmin Bank | Stock granted in 2018
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	73,989	[2]
Vesting conditions	Satisfied
Kookmin Bank | Stock granted in 2019
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	125,530	[2]
Vesting conditions	Satisfied
Kookmin Bank | Stock granted in 2020
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	121,676	[2]
Vesting conditions	Proportional to service period
Other subsidiaries
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Explanation Of Share Options In Sharebased Payment Arrangement	The Group changed the scheme of share-based payments from stock options to stock grants in November 2007. The stock grants award program is an incentive plan that sets, on grant date, the maximum number of shares that can be awarded. Actual shares to be granted is determined in accordance with achievement of pre-set performance targets over the vesting period.
Other subsidiaries | Linked to long term performance
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	772,185	[1]
Other subsidiaries | Stock granted in 2010
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	106	[1]
Vesting conditions	Services fulfillment, market performance 10~50% and non-market performance 50~90%	[2],[3],[4]
Other subsidiaries | Stock granted in 2011
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	146	[1]
Vesting conditions	Services fulfillment, market performance 10~50% and non-market performance 50~90%	[2],[3],[4]
Other subsidiaries | Stock granted in 2012
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	420	[1]
Vesting conditions	Services fulfillment, market performance 10~50% and non-market performance 50~90%	[2],[3],[4]
Other subsidiaries | Stock granted in 2013
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	622	[1]
Vesting conditions	Services fulfillment, market performance 10~50% and non-market performance 50~90%	[2],[3],[4]
Other subsidiaries | Stock granted in 2014
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	1,028	[1]
Vesting conditions	Services fulfillment, market performance 10~50% and non-market performance 50~90%	[2],[3],[4]
Other subsidiaries | Stock granted in 2015
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	3,323	[1]
Vesting conditions	Services fulfillment, market performance 10~50% and non-market performance 50~90%	[2],[3],[4]
Other subsidiaries | Stock granted in 2016
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	9,103	[1]
Vesting conditions	Services fulfillment, market performance 10~50% and non-market performance 50~90%	[2],[3],[4]
Other subsidiaries | Stock granted in 2017
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	36,814	[1]
Vesting conditions	Services fulfillment, market performance 10~50% and non-market performance 50~90%	[2],[3],[4]
Other subsidiaries | Stock granted in 2018
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	120,266	[1]
Vesting conditions	Services fulfillment, market performance 10~50% and non-market performance 50~90%	[2],[3],[4]
Other subsidiaries | Stock granted in 2019
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	331,688	[1]
Vesting conditions	Services fulfillment, market performance 10~50% and non-market performance 50~90%	[2],[3],[4]
Other subsidiaries | Stock granted in 2020
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Number of granted shares	268,669	[1]
Vesting conditions	Services fulfillment, market performance 10~50% and non-market performance 50~90%	[2],[3],[4]
Other subsidiaries | Stock granted in 2015
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	12,191	[2]
Vesting conditions	Satisfied
Other subsidiaries | Stock granted in 2016
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	40,970	[2]
Vesting conditions	Satisfied
Other subsidiaries | Stock granted in 2017
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	149,329	[2]
Vesting conditions	Satisfied
Other subsidiaries | Stock granted in 2018
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	345,546	[2]
Vesting conditions	Satisfied
Other subsidiaries | Stock granted in 2019
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	551,667	[2]
Vesting conditions	Satisfied
Other subsidiaries | Stock granted in 2020
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Estimated number of vested shares	290,013	[2]
Vesting conditions	Proportional to service period
[1]	Granted shares represent the total number of shares initially granted to executives and employees who have residual shares as of December 31, 2020 (Deferred grants are residual shares vested as of December 31, 2020).
[2]	Executives and employees were given the option of deferred payment of the granted shares (after the date of retirement), payment ratio, and payment period. Accordingly, a certain percentage of the granted amount is deferred for up to five years after the date of retirement after the deferred grant has been confirmed.
[3]	Companies' and individuals' performance results
[4]	Relative TSR (Total Shareholders Return): [(Fair value at the end of the contract - Fair value at the beginning of the contract) + (Total amount of dividend per share paid during the contract period)] / Fair value at the beginning of the contract
[5]	EPS, Asset Quality, HCROI, Profit from non-banking segments
[6]	EPS, Asset Quality

General and Administrative Ex_5

General and Administrative Expenses_Share Grants Are Measured At Fair Value Using The Monte Carlo Simulation Model And Assumptions Used In Determining The Fair Value(Details) - KRW (₩)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Information about how fair value was measured, share options granted	The Group used the volatility of the stock price over the previous year as the expected volatility, and used the arithmetic mean of the dividend rate of one year before, two years before, and three years before the base year as the dividend rate, and used one-year risk-free rate of Korea Treasury Bond in order to calculate fair value.
Liabilities From Share Grants	₩ 135,327,000,000	₩ 124,853,000,000
Expense From Share Grants Transactions With Employees	₩ 48,712,000,000	₩ 49,418,000,000
KB Financial Group Inc. | Series 21
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Series 21 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 38,789
Fair value (Non-market performance condition)	38,789
KB Financial Group Inc. | Series 21 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	45,096
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Series 22
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Series 22 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 37,324
Fair value (Non-market performance condition)	37,324
KB Financial Group Inc. | Series 22 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	41,899
Fair value (Non-market performance condition)	₩ 41,899
KB Financial Group Inc. | Series 23
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Series 23 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 37,324
Fair value (Non-market performance condition)	37,324
KB Financial Group Inc. | Series 23 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	41,899
Fair value (Non-market performance condition)	₩ 41,899
KB Financial Group Inc. | Series 24
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Series 24 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 38,789
Fair value (Non-market performance condition)	38,789
KB Financial Group Inc. | Series 24 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	45,096
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Series 25
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Series 25 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 37,324
Fair value (Non-market performance condition)	37,324
KB Financial Group Inc. | Series 25 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	45,096
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Series 26
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Series 26 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 38,789
Fair value (Non-market performance condition)	38,789
KB Financial Group Inc. | Series 26 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	45,096
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Series 27
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Series 27 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 38,789
Fair value (Non-market performance condition)	38,789
KB Financial Group Inc. | Series 27 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	45,096
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Series 28
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Series 28 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 30,871
Fair value (Non-market performance condition)	34,694
KB Financial Group Inc. | Series 28 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	34,675
Fair value (Non-market performance condition)	₩ 38,969
KB Financial Group Inc. | Deferred grant in 2015
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Deferred grant in 2015 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 35,895
KB Financial Group Inc. | Deferred grant in 2015 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Deferred grant in 2016
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Deferred grant in 2016 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
KB Financial Group Inc. | Deferred grant in 2016 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Deferred grant in 2017
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Deferred grant in 2017 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 40,299
KB Financial Group Inc. | Deferred grant in 2017 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Deferred Grant In 2018
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Deferred Grant In 2018 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
KB Financial Group Inc. | Deferred Grant In 2018 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Deferred Grant In 2019
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Deferred Grant In 2019 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 40,299
KB Financial Group Inc. | Deferred Grant In 2019 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 47,631
KB Financial Group Inc. | Deferred Grant In 2020
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Deferred Grant In 2020 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,969
KB Financial Group Inc. | Deferred Grant In 2020 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 42,065
KB Financial Group Inc. | Stock granted in 2015
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Stock granted in 2015 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 35,895
KB Financial Group Inc. | Stock granted in 2015 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Stock granted in 2016
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Stock granted in 2016 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 34,581
KB Financial Group Inc. | Stock granted in 2016 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Stock granted in 2017
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Stock granted in 2017 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
KB Financial Group Inc. | Stock granted in 2017 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Stock granted in 2018
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Stock granted in 2018 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
KB Financial Group Inc. | Stock granted in 2018 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 47,631
KB Financial Group Inc. | Stock granted in 2019
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Stock granted in 2019 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 40,299
KB Financial Group Inc. | Stock granted in 2019 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
KB Financial Group Inc. | Stock granted in 2020
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
KB Financial Group Inc. | Stock granted in 2020 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
KB Financial Group Inc. | Stock granted in 2020 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 42,065
Kookmin Bank | Series 75
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Series 75 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 38,789
Fair value (Non-market performance condition)	38,789
Kookmin Bank | Series 75 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	45,096
Fair value (Non-market performance condition)	₩ 45,096
Kookmin Bank | Series 76
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Series 76 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 37,324
Fair value (Non-market performance condition)	37,324
Kookmin Bank | Series 76 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	41,899
Fair value (Non-market performance condition)	₩ 41,899
Kookmin Bank | Series 77
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Series 77 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 37,324
Fair value (Non-market performance condition)	37,324
Kookmin Bank | Series 77 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	41,899
Fair value (Non-market performance condition)	₩ 41,899
Kookmin Bank | Series 78
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Series 78 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 36,370
Fair value (Non-market performance condition)	37,324
Kookmin Bank | Series 78 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	40,828
Fair value (Non-market performance condition)	₩ 41,899
Kookmin Bank | Series 79
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Series 79 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 37,324
Fair value (Non-market performance condition)	37,324
Kookmin Bank | Series 79 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	45,096
Fair value (Non-market performance condition)	₩ 45,096
Kookmin Bank | Series 80
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Series 80 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 35,895
Fair value (Non-market performance condition)	35,895
Kookmin Bank | Series 80 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	40,299
Fair value (Non-market performance condition)	₩ 40,299
Kookmin Bank | Deferred grant in 2015
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Deferred grant in 2015 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 41,899
Kookmin Bank | Deferred grant in 2015 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
Kookmin Bank | Deferred grant in 2016
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Deferred grant in 2016 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
Kookmin Bank | Deferred grant in 2016 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
Kookmin Bank | Deferred grant in 2017
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Deferred grant in 2017 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
Kookmin Bank | Deferred grant in 2017 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
Kookmin Bank | Deferred Grant In 2018
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Deferred Grant In 2018 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
Kookmin Bank | Deferred Grant In 2018 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
Kookmin Bank | Deferred Grant In 2019
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Deferred Grant In 2019 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 40,299
Kookmin Bank | Deferred Grant In 2019 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
Kookmin Bank | Stock granted in 2015
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Stock granted in 2015 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
Kookmin Bank | Stock granted in 2015 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 47,153
Kookmin Bank | Stock granted in 2016
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Stock granted in 2016 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 37,324
Kookmin Bank | Stock granted in 2016 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 61,294
Kookmin Bank | Stock granted in 2017
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Stock granted in 2017 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
Kookmin Bank | Stock granted in 2017 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 47,631
Kookmin Bank | Stock granted in 2018
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Stock granted in 2018 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
Kookmin Bank | Stock granted in 2018 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 47,631
Kookmin Bank | Stock granted in 2019
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Stock granted in 2019 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 40,299
Kookmin Bank | Stock granted in 2019 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
Kookmin Bank | Stock granted in 2020
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Kookmin Bank | Stock granted in 2020 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 38,789
Kookmin Bank | Stock granted in 2020 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 41,899
Other subsidiaries | Stock granted in 2010
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2010 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 40,299
Other subsidiaries | Stock granted in 2010 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 40,299
Other subsidiaries | Stock granted in 2011
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2011 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 40,299
Other subsidiaries | Stock granted in 2011 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 40,299
Other subsidiaries | Stock granted in 2012
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2012 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 40,299
Other subsidiaries | Stock granted in 2012 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 41,899
Other subsidiaries | Stock granted in 2013
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2013 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 35,692
Other subsidiaries | Stock granted in 2013 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 41,899
Other subsidiaries | Stock granted in 2014
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2014 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 41,899
Other subsidiaries | Stock granted in 2014 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 41,899
Other subsidiaries | Stock granted in 2015
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2015 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 34,581
Other subsidiaries | Stock granted in 2015 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 47,631
Other subsidiaries | Stock granted in 2016
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2016 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 37,324
Other subsidiaries | Stock granted in 2016 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 56,293
Other subsidiaries | Stock granted in 2017
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2017 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 34,581
Other subsidiaries | Stock granted in 2017 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 61,294
Other subsidiaries | Stock granted in 2018
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2018 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 33,612
Fair value (Non-market performance condition)	35,895
Other subsidiaries | Stock granted in 2018 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	44,072
Fair value (Non-market performance condition)	₩ 47,631
Other subsidiaries | Stock granted in 2019
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2019 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 37,324
Fair value (Non-market performance condition)	34,581
Other subsidiaries | Stock granted in 2019 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	45,096
Fair value (Non-market performance condition)	₩ 47,631
Other subsidiaries | Stock granted in 2020
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2020 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	₩ 35,780
Fair value (Non-market performance condition)	35,895
Other subsidiaries | Stock granted in 2020 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Market performance condition)	45,096
Fair value (Non-market performance condition)	₩ 45,096
Other subsidiaries | Stock granted in 2015
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2015 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 34,581
Other subsidiaries | Stock granted in 2015 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
Other subsidiaries | Stock granted in 2016
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2016 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 34,581
Other subsidiaries | Stock granted in 2016 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 47,631
Other subsidiaries | Stock granted in 2017
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2017 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 34,581
Other subsidiaries | Stock granted in 2017 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 47,631
Other subsidiaries | Stock granted in 2018
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2018 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 34,581
Other subsidiaries | Stock granted in 2018 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 47,631
Other subsidiaries | Stock granted in 2019
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2019 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 34,581
Other subsidiaries | Stock granted in 2019 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 45,096
Other subsidiaries | Stock granted in 2020
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Risk free rate (%)	0.74%
Other subsidiaries | Stock granted in 2020 | Bottom Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 35,895
Other subsidiaries | Stock granted in 2020 | Top Of Range Member [Member]
Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items]
Fair value (Non-market performance condition)	₩ 43,147

General and Administrative Ex_6

General and Administrative Expenses_Details Of Mileage Stock(Details) ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)shares	Dec. 31, 2019KRW (₩)
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Number of granted shares	[1]	78,706
Remaining shares		65,944
Explanation Of Effect Of Mileage Stock On Financial Positions		Mileage stock is exercisable for two years after one year from the grant date. When the mileage stock is exercised, the closing price of prior month is applied. However, in case of transfer or retirement during the vesting period, mileage stock is exercisable at the closing price of the last month prior to transfer or retirement.
Liabilities From Mileage Stock | ₩		₩ 2,862	₩ 2,705
Explanation Of Effect Of Mileage Stock On Profit Or Loss		The shares are assessed based on the stock price as of December 31, 2020. These shares are vested immediately at grant date.
Expense From Mileage Stock Transactions With Employees | ₩		₩ 1,086	₩ 1,334
Stock Granted in 201801
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Jan. 10, 2018
Number of granted shares	[1]	19,197
Expected exercise period (Years)	[2]	0.02
Remaining shares		13,522
Stock Granted in 201802
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Feb. 12, 2018
Number of granted shares	[1]	9
Expected exercise period (Years)	[2]	0.12
Remaining shares		3
Stock Granted in 201803
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Apr. 2, 2018
Number of granted shares	[1]	115
Expected exercise period (Years)	[2]	0.25
Remaining shares		82
Stock Granted in 201804
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Apr. 30, 2018
Number of granted shares	[1]	86
Expected exercise period (Years)	[2]	0.33
Remaining shares		49
Stock Granted in 201805
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		May 8, 2018
Number of granted shares	[1]	170
Expected exercise period (Years)	[2]	0.35
Remaining shares		140
Stock Granted in 201806
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Jun. 1, 2018
Number of granted shares	[1]	140
Expected exercise period (Years)	[2]	0.41
Remaining shares		106
Stock Granted in 201807
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Jul. 2, 2018
Number of granted shares	[1]	180
Expected exercise period (Years)	[2]	0.5
Remaining shares		123
Stock Granted in 201808
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Aug. 7, 2018
Number of granted shares	[1]	194
Expected exercise period (Years)	[2]	0.6
Remaining shares		149
Stock Granted in 201809
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Aug. 9, 2018
Number of granted shares	[1]	47
Expected exercise period (Years)	[2]	0.6
Remaining shares		31
Stock Granted in 201810
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Aug. 14, 2018
Number of granted shares	[1]	30
Expected exercise period (Years)	[2]	0.62
Remaining shares		26
Stock Granted in 201811
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Aug. 16, 2018
Number of granted shares	[1]	130
Expected exercise period (Years)	[2]	0.62
Remaining shares		93
Stock Granted in 201812
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Sep. 7, 2018
Number of granted shares	[1]	106
Expected exercise period (Years)	[2]	0.68
Remaining shares		77
Stock Granted in 201813
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Oct. 4, 2018
Number of granted shares	[1]	129
Expected exercise period (Years)	[2]	0.76
Remaining shares		78
Stock Granted in 201814
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Nov. 1, 2018
Number of granted shares	[1]	258
Expected exercise period (Years)	[2]	0.83
Remaining shares		200
Stock Granted in 201815
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Nov. 6, 2018
Number of granted shares	[1]	236
Expected exercise period (Years)	[2]	0.85
Remaining shares		168
Stock Granted in 201816
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 3, 2018
Number of granted shares	[1]	132
Expected exercise period (Years)	[2]	0.92
Remaining shares		127
Stock Granted in 201817
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 4, 2018
Number of granted shares	[1]	21
Expected exercise period (Years)	[2]	0.92
Remaining shares		21
Stock Granted in 201818
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 7, 2018
Number of granted shares	[1]	91
Expected exercise period (Years)	[2]	0.93
Remaining shares		78
Stock Granted in 201819
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 12, 2018
Number of granted shares	[1]	64
Expected exercise period (Years)	[2]	0.95
Remaining shares		32
Stock Granted in 201820
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 18, 2018
Number of granted shares	[1]	271
Expected exercise period (Years)	[2]	0.96
Remaining shares		237
Stock Granted in 201821
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 19, 2018
Number of granted shares	[1]	42
Expected exercise period (Years)	[2]	0.96
Remaining shares		34
Stock Granted in 201822
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 31, 2018
Number of granted shares	[1]	127
Expected exercise period (Years)	[2]	1
Remaining shares		106
Stock Granted in 201901
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Jan. 11, 2019
Number of granted shares	[1]	26,580
Expected exercise period (Years)	[2]	1.03
Remaining shares		21,231
Stock Granted in 201902
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Feb. 1, 2019
Number of granted shares	[1]	12
Expected exercise period (Years)	[2]	1.08
Remaining shares		8
Stock Granted in 201903
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Apr. 1, 2019
Number of granted shares	[1]	167
Expected exercise period (Years)	[2]	1.25
Remaining shares		96
Stock Granted in 201904
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Apr. 18, 2019
Number of granted shares	[1]	105
Expected exercise period (Years)	[2]	1.29
Remaining shares		81
Stock Granted in 201905
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Apr. 22, 2019
Number of granted shares	[1]	33
Expected exercise period (Years)	[2]	1.3
Remaining shares		33
Stock Granted in 201906
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Jul. 1, 2019
Number of granted shares	[1]	109
Expected exercise period (Years)	[2]	1.5
Remaining shares		87
Stock Granted in 201907
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Aug. 29, 2019
Number of granted shares	[1]	39
Expected exercise period (Years)	[2]	1.66
Remaining shares		39
Stock Granted in 201908
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Sep. 2, 2019
Number of granted shares	[1]	50
Expected exercise period (Years)	[2]	1.67
Remaining shares		50
Stock Granted in 201909
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Nov. 1, 2019
Number of granted shares	[1]	119
Expected exercise period (Years)	[2]	1.83
Remaining shares		95
Stock Granted in 201910
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Nov. 8, 2019
Number of granted shares	[1]	14
Expected exercise period (Years)	[2]	1.85
Remaining shares		14
Stock Granted in 201911
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 5, 2019
Number of granted shares	[1]	56
Expected exercise period (Years)	[2]	1.93
Remaining shares		54
Stock Granted in 201912
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 6, 2019
Number of granted shares	[1]	84
Expected exercise period (Years)	[2]	1.93
Remaining shares		84
Stock Granted in 201913
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 31, 2019
Number of granted shares	[1]	87
Expected exercise period (Years)	[2]	2
Remaining shares		87
Stock Granted in 202001
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Jan. 18, 2020
Number of granted shares	[1]	28,645
Expected exercise period (Years)	[2]	2.05
Remaining shares		27,672
Stock Granted in 202002
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		May 12, 2020
Number of granted shares	[1]	46
Expected exercise period (Years)	[2]	2.36
Remaining shares		46
Stock Granted in 202003
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Jun. 30, 2020
Number of granted shares	[1]	206
Expected exercise period (Years)	[2]	2.5
Remaining shares		206
Stock Granted in 202004
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Aug. 26, 2020
Number of granted shares	[1]	40
Expected exercise period (Years)	[2]	2.65
Remaining shares		40
Stock Granted in 202005
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Oct. 29, 2020
Number of granted shares	[1]	160
Expected exercise period (Years)	[2]	2.83
Remaining shares		160
Stock Granted in 202006
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Nov. 6, 2020
Number of granted shares	[1]	45
Expected exercise period (Years)	[2]	2.85
Remaining shares		45
Stock Granted in 202007
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Nov. 30, 2020
Number of granted shares	[1]	35
Expected exercise period (Years)	[2]	2.92
Remaining shares		35
Stock Granted in 202008
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 2, 2020
Number of granted shares	[1]	57
Expected exercise period (Years)	[2]	2.92
Remaining shares		57
Stock Granted in 202009
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 4, 2020
Number of granted shares	[1]	154
Expected exercise period (Years)	[2]	2.93
Remaining shares		154
Stock Granted in 202010
Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items]
Grant date		Dec. 30, 2020
Number of granted shares	[1]	88
Expected exercise period (Years)	[2]	3
Remaining shares		88
[1]	Mileage stock is exercisable for two years after one year from the grant date. When the mileage stock is exercised, the closing price of prior month is applied. However, in case of transfer or retirement during the vesting period, mileage stock is exercisable at the closing price of the last month prior to transfer or retirement.
[2]	The shares are assessed based on the stock price as of December 31, 2020. These shares are vested immediately at grant date.

General And Aministrative Expen

General And Aministrative Expenses_Details Of Long Term Share Based Payments(Details)	12 Months Ended
	Dec. 31, 2020KRW (₩)shares
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items]
Grant date	Granted in 2020
Type of payment	Cash-settled
Vested shares | shares	16,800
Expected exercise period (years)	3
Valuation method	MonteCarlo Simulation Model
Vesting Condition	Services fulfillment
Risk-free rate (%)	0.741%
Fair value (Market performance condition)	₩ 0
Fair value (Non-market performance condition)	₩ 38,789
Information about how fair value was measured	The Group used the volatility of the stock price over the previous year as the expected volatility, and used the arithmetic mean of the dividend rate of one year before, two years before, and three years before the base year as the dividend rate, and used one-year risk-free rate of Korea Treasury Bond in order to calculate fair value.
Liabilities From Long-Term Share Based Payments	₩ 652,000,000
Expense From Long Term Share Based Payments Transactions	₩ 652,000,000

Non-operating Income and Expe_3

Non-operating Income and Expenses_Details Of Other Nonoperating Income And Expenses(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Non-operating income
Gain on disposal of property and equipment		₩ 111,132		₩ 35,747	₩ 34,238
Rental Income		113,075		85,720	55,321
Gains on bargain purchase	[1]	145,067	$ 133,566	0	0
Gain on sales of disposal group held for sale		0		2,731	118,716
Others		96,931		84,793	37,122
Sub-total		466,205		208,991	245,397
Non-operating expenses
Loss on disposal of property and equipment		11,945		8,587	6,131
Donation		113,083		102,711	130,249
Restoration Cost		5,043		2,902	4,386
Management cost for written-off loans		3,018		3,382	3,338
Others		143,726		64,523	91,502
Sub-total		276,815		182,105	235,606
Net non-operating income	[2]	₩ 189,390	$ 174,374	₩ 26,886	₩ 9,791
[1]	The consolidated statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Income Tax Expense_Income Tax E

Income Tax Expense_Income Tax Expense(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Tax payable
Current tax expense		₩ 1,099,171		₩ 1,043,047	₩ 1,096,600
Adjustments of tax of prior years recognized in current tax		(13,434)		(51,130)	22,925
Sub-total		1,085,737		991,917	1,119,525
Changes in deferred income tax assets (liabilities)	[1]	323,032		285,820	114,345
Income Tax Effects Allocated Directly To Equity [Abstract]
Remeasurements of net defined benefit liabilities		3,792		21,172	52,377
Exchange differences on translating foreign operations		14,988		(5,714)	(13,087)
Net gains or losses on financial instruments at fair value through other comprehensive income		(88,907)		(13,168)	(33,329)
Shares of other comprehensive income or loss of associates and joint ventures		2,976		(3,147)	1,374
Gains or losses on cash flow hedging instruments		7,580		10,537	400
Gains or losses on hedging instruments of net investments in foreign operations		(24,500)		3,194	10,292
Other comprehensive income or loss arising from separate account		3,671		(1,301)	(10,864)
Fair value changes on financial liabilities designated at fair value due to own credit risk		(3,350)		4,294	(563)
Net gains or losses on overlay approach adjustment		(61,637)		(72,817)	(884)
Consideration for exchangeable rights		(4,526)		0	0
Sub-total		(149,913)		(56,950)	5,716
Others		495		0	0
Income tax expense	[2]	₩ 1,259,351	$ 1,159,506	₩ 1,220,787	₩ 1,239,586
[1]	Effect of business combination is excluded.
[2]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Income Tax Expense_An Analysis

Income Tax Expense_An Analysis Of The Net Profit Before Income Tax And Income Tax Expense(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Reconciliation Of Average Effective Tax Rate And Applicable Tax Rate Abstract [Abstract]
Profit before tax	[1]	₩ 4,761,632	$ 4,384,116	₩ 4,533,986	₩ 4,301,532
Tax at the applicable tax rate (Amount)	[2]	1,299,087		1,236,484	1,172,559
Non-taxable income (Amount)		(73,855)		(23,601)	(11,888)
Non-deductible expense (Amount)		16,541		19,086	27,551
Tax credit and tax exemption (Amount)		(4,016)		(627)	(637)
Temporary difference for which no deferred tax is recognized (Amount)		22,189		(4,860)	12,260
Changes in recognition and measurement of deferred tax (Amount)		11,616		(100)	(2,692)
Income tax refund for tax of prior years (Amount)		(22,139)		(9,105)	(8,135)
Income tax expense of overseas branch (Amount)		10,739		5,004	3,882
Effects from change in tax rate (Amount)		0		0	(1,470)
Others (Amount)		(811)		(1,494)	48,156
Average effective tax expense	[1]	₩ 1,259,351	$ 1,159,506	₩ 1,220,787	₩ 1,239,586
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation Abstract [Abstract]
Tax at the applicable tax rate (Tax rate)	[2]	27.28%	27.28%	27.27%	27.26%
Non-taxable income (Tax rate)		(1.55%)	(1.55%)	(0.52%)	(0.28%)
Non-deductible expense (Tax rate)		0.35%	0.35%	0.42%	0.64%
Tax credit and tax exemption (Tax rate)		(0.08%)	(0.08%)	(0.01%)	(0.01%)
Temporary difference for which no deferred tax is recognized (Tax rate)		0.47%	0.47%	(0.11%)	0.29%
Changes in recognition and measurement of deferred tax (Tax rate)		0.24%	0.24%	0.00%	(0.06%)
Income tax refund for tax of prior years (Tax rate)		(0.46%)	(0.46%)	(0.20%)	(0.19%)
Income tax expense of overseas branch (Tax rate)		0.23%	0.23%	0.11%	0.09%
Effects from change in tax rate (Tax rate)		0.00%	0.00%	0.00%	(0.03%)
Others (Tax rate)		(0.02%)	(0.02%)	(0.03%)	1.12%
Average effective tax rate		26.45%	26.45%	26.93%	28.82%
Description Of Applicable Tax Rate By Taxable Income		Applicable income tax rate for KRW 200 million and below is 11%, for over KRW 200 million to KRW 20 billion is 22%, for over KRW 20 billion to KRW 300 billion is 24.2% and for over KRW 300 billion is 27.5% for the years ended December 31, 2018, 2019 and 2020.	Applicable income tax rate for KRW 200 million and below is 11%, for over KRW 200 million to KRW 20 billion is 22%, for over KRW 20 billion to KRW 300 billion is 24.2% and for over KRW 300 billion is 27.5% for the years ended December 31, 2018, 2019 and 2020.	Applicable income tax rate for KRW 200 million and below is 11%, for over KRW 200 million to KRW 20 billion is 22%, for over KRW 20 billion to KRW 300 billion is 24.2% and for over KRW 300 billion is 27.5% for the years ended December 31, 2018, 2019 and 2020.	Applicable income tax rate for KRW 200 million and below is 11%, for over KRW 200 million to KRW 20 billion is 22%, for over KRW 20 billion to KRW 300 billion is 24.2% and for over KRW 300 billion is 27.5% for the years ended December 31, 2018, 2019 and 2020.
[1]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	Applicable income tax rate for KRW 200 million and below is 11%, for over KRW 200 million to KRW 20 billion is 22%, for over KRW 20 billion to KRW 300 billion is 24.2% and for over KRW 300 billion is 27.5% for the years ended December 31, 2018, 2019 and 2020.

Dividends_Dividends(Details)

Dividends_Dividends(Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Dividends Abstract [Abstract]
Dividends Recognised As Distributions To Owners Of Parent	₩ 861,092	₩ 759,736
Dividends Recognised As Distributions To Owners Per Share	₩ 2,210	₩ 1,920
Dividends Proposed Or Declared Before Financial Statements Authorised For Issue But Not Recognised As Distribution To Owners	₩ 689,653
Dividends Proposed Or Declared Before Financial Statements Authorised For Issue But Not Recognised As Distribution To Owners Per Share	₩ 1,770

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income_Details Of Accumulated Other Comprehensive Income (Loss)(Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Disclosure Of Analysis Of Other Comprehensive Income By Item Line Items [Line Items]
Beginning	₩ 348,021		₩ 177,806
Changes except for reclassification	865,957		275,038
Reclassification to profit or loss	(129,844)		(73,356)
Transfer to retained earnings	(326,410)		25,483
Tax effect	(145,387)		(56,950)	₩ 5,716
Ending	612,337	$ 563,789	348,021	177,806
Remeasurements of net defined benefit liabilities
Disclosure Of Analysis Of Other Comprehensive Income By Item Line Items [Line Items]
Beginning	(290,228)		(234,401)
Changes except for reclassification	(13,888)		(76,999)
Reclassification to profit or loss	0		0
Transfer to retained earnings	0		0
Tax effect	3,792		21,172
Ending	(300,324)		(290,228)	(234,401)
Exchange differences on translating foreign operations
Disclosure Of Analysis Of Other Comprehensive Income By Item Line Items [Line Items]
Beginning	31,793		(5,784)
Changes except for reclassification	(177,894)		37,938
Reclassification to profit or loss	0		5,353
Transfer to retained earnings	0		0
Tax effect	14,988		(5,714)
Ending	(131,113)		31,793	(5,784)
Net gains on financial instruments at fair value through other comprehensive income
Disclosure Of Analysis Of Other Comprehensive Income By Item Line Items [Line Items]
Beginning	487,331		450,694
Changes except for reclassification	757,236		106,984
Reclassification to profit or loss	(112,020)		(82,662)
Transfer to retained earnings	(326,410)		25,483
Tax effect	(88,907)		(13,168)
Ending	717,230		487,331	450,694
Share of other comprehensive income (loss) of associates and joint ventures
Disclosure Of Analysis Of Other Comprehensive Income By Item Line Items [Line Items]
Beginning	3,318		(4,377)
Changes except for reclassification	(3,923)		10,842
Reclassification to profit or loss	(5,900)		0
Transfer to retained earnings	0		0
Tax effect	2,976		(3,147)
Ending	(3,529)		3,318	(4,377)
Gains (losses) on cash flow hedging instruments
Disclosure Of Analysis Of Other Comprehensive Income By Item Line Items [Line Items]
Beginning	(27,333)		5,849
Changes except for reclassification	(48,034)		(65,323)
Reclassification to profit or loss	39,190		21,604
Transfer to retained earnings	0		0
Tax effect	7,580		10,537
Ending	(28,597)		(27,333)	5,849
Gains (losses) on hedging instruments of net investments in foreign operations
Disclosure Of Analysis Of Other Comprehensive Income By Item Line Items [Line Items]
Beginning	(41,992)		(33,092)
Changes except for reclassification	88,769		(13,410)
Reclassification to profit or loss	0		1,316
Transfer to retained earnings	0		0
Tax effect	(24,500)		3,194
Ending	22,277		(41,992)	(33,092)
Other comprehensive income arising from separate account
Disclosure Of Analysis Of Other Comprehensive Income By Item Line Items [Line Items]
Beginning	18,381		15,017
Changes except for reclassification	2,834		21,029
Reclassification to profit or loss	(16,188)		(16,364)
Transfer to retained earnings	0		0
Tax effect	3,671		(1,301)
Ending	8,698		18,381	15,017
Fair value changes on financial liabilities designated at fair value due to own credit risk
Disclosure Of Analysis Of Other Comprehensive Income By Item Line Items [Line Items]
Beginning	(20,326)		(8,954)
Changes except for reclassification	12,169		(15,666)
Reclassification to profit or loss	0		0
Transfer to retained earnings	0		0
Tax effect	(3,350)		4,294
Ending	(11,507)		(20,326)	(8,954)
Net gains (losses) on overlay approach adjustment
Disclosure Of Analysis Of Other Comprehensive Income By Item Line Items [Line Items]
Beginning	187,077		(7,146)
Changes except for reclassification	248,688		269,643
Reclassification to profit or loss	(34,926)		(2,603)
Transfer to retained earnings	0		0
Tax effect	(61,637)		(72,817)
Ending	₩ 339,202		₩ 187,077	₩ (7,146)

Earnings per Share_Basic Earnin

Earnings per Share_Basic Earnings per Share(Details)		12 Months Ended
		Dec. 31, 2020KRW (₩)₩ / sharesshares	Dec. 31, 2020$ / sharesshares	Dec. 31, 2019KRW (₩)₩ / sharesshares	Dec. 31, 2018KRW (₩)₩ / sharesshares
Earnings per share
Weighted average number of ordinary shares outstanding (B)		389,634,335		391,131,683	396,499,958
Profit attributable to shareholders of the Parent Company | ₩		₩ 3,455,151,501,224		₩ 3,311,827,412,557	₩ 3,061,191,387,929
Deduction: Dividends on hybrid securities | ₩		22,859,500,000		6,512,500,000	0
Profit attributable to the ordinary equity holders of the Parent Company (A) | ₩		₩ 3,432,292,001,224		₩ 3,305,314,912,557	₩ 3,061,191,387,929
Basic earnings per share (C = A / B) | (per share)	[1]	₩ 8,809	$ 8.11	₩ 8,451	₩ 7,721
Number of shares
Earnings per share
Number of issued ordinary shares		415,807,920	415,807,920	415,807,920	418,111,537
Number of treasury shares		(26,173,585)	(26,173,585)	(26,173,585)	(22,560,240)
Average number of ordinary shares outstanding		389,634,335	389,634,335	389,634,335	395,551,297
Accumulated Amount
Earnings per share
Number of issued ordinary shares		152,185,698,720	152,185,698,720	152,564,638,665	152,610,711,005
Number of treasury shares		(9,579,532,110)	(9,579,532,110)	(9,801,574,522)	(7,888,226,378)
Average number of ordinary shares outstanding		142,606,166,610	142,606,166,610	142,763,064,143	144,722,484,627
Number Of Days		366		365	365
Weighted average number of ordinary shares outstanding (B)		389,634,335		391,131,683	396,499,958
[1]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Earnings per Share_Diluted Earn

Earnings per Share_Diluted Earnings Per Share(Details)		12 Months Ended
		Dec. 31, 2020KRW (₩)₩ / sharesshares	Dec. 31, 2020$ / shares	Dec. 31, 2019KRW (₩)₩ / sharesshares	Dec. 31, 2018KRW (₩)₩ / sharesshares
Basic And Diluted Earnings Per Share Abstract [Abstract]
Explanation Of Adjustments Between Denominators Used To Calculate Basic And Diluted Earnings Per Share		A calculation is done to determine the number of shares that could have been acquired at fair value (determined as the average market share price for the year) based on the monetary value of stock grants. The number of shares calculated above is compared with the number of shares that would have been issued assuming the settlement of stock grants. In addition, exchangeable bonds issued for the year ended December 31, 2020, were included in potential ordinary shares from the exercisable date of the exchange right, and interest expenses after tax for the period were added to profit for diluted earnings per share.		A calculation is done to determine the number of shares that could have been acquired at fair value (determined as the average market share price for the year) based on the monetary value of stock grants. The number of shares calculated above is compared with the number of shares that would have been issued assuming the settlement of stock grants.	A calculation is done to determine the number of shares that could have been acquired at fair value (determined as the average market share price for the year) based on the monetary value of stock grants. The number of shares calculated above is compared with the number of shares that would have been issued assuming the settlement of stock grants.
Profit Loss Attributable To Ordinary Equity Holders Of Parent Entity Including Dilutive Effects Abstract [Abstract]
Profit attributable to shareholders of the Parent Company		₩ 3,455,151,501,224		₩ 3,311,827,412,557	₩ 3,061,191,387,929
Deduction: Dividends on hybrid securities		22,859,500,000		6,512,500,000	0
Profit attributable to the ordinary equity holders of the Parent Company		3,432,292,001,224		3,305,314,912,557	3,061,191,387,929
Adjustments: Interest expense on exchangeable bonds		798,012,332		0	0
Adjusted profit for diluted earnings per share		₩ 3,433,090,013,556		₩ 3,305,314,912,557	₩ 3,061,191,387,929
Weighted Average Shares And Adjusted Weighted Average Shares Abstract
Weighted average number of ordinary shares outstanding | shares		389,634,335		391,131,683	396,499,958
Stock grants | shares		3,416,737		2,890,513	2,307,630
Exchangeable bonds | shares		1,707,650		0	0
Adjusted weighted average number of ordinary shares outstanding for diluted earnings per share | shares		394,758,722		394,022,196	398,807,588
Basic and diluted earnings per share [Abstract]
Adjusted profit for diluted earnings per share		₩ 3,433,090,013,556		₩ 3,305,314,912,557	₩ 3,061,191,387,929
Adjusted weighted average number of ordinary shares outstanding for diluted earnings per share | shares		394,758,722		394,022,196	398,807,588
Diluted earnings per share | (per share)	[1]	₩ 8,697	$ 8.01	₩ 8,389	₩ 7,676
[1]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Insurance Contracts_Details Of

Insurance Contracts_Details Of Deferred Acquisition Costs Included In Other Assets(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Acquisition Costs Arising From Insurance Contracts LineItems[Line Items]
Total	₩ 1,170,972	₩ 921,365	₩ 667,124
Non-life insurance
Deferred Acquisition Costs Arising From Insurance Contracts LineItems[Line Items]
Total	965,683	786,626	547,831
Life insurance
Deferred Acquisition Costs Arising From Insurance Contracts LineItems[Line Items]
Total	₩ 205,289	₩ 134,739	₩ 119,293

Insurance Contracts_Changes In

Insurance Contracts_Changes In The Deferred Acquisition Costs(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation Of Changes In Deferred Acquisition Costs Arising From Insurance Contracts LineItems [Line Items]
Beginning	₩ 921,365	₩ 667,124
Increase	1,017,240	933,520
Amortization	(767,633)	(679,279)	₩ (606,073)
Ending	1,170,972	921,365	667,124
Non-life insurance
Reconciliation Of Changes In Deferred Acquisition Costs Arising From Insurance Contracts LineItems [Line Items]
Beginning	786,626	547,831
Increase	872,811	815,712
Amortization	(693,754)	(576,917)
Ending	965,683	786,626	547,831
Life insurance
Reconciliation Of Changes In Deferred Acquisition Costs Arising From Insurance Contracts LineItems [Line Items]
Beginning	134,739	119,293
Increase	144,429	117,808
Amortization	(73,879)	(102,362)
Ending	₩ 205,289	₩ 134,739	₩ 119,293

Insurance Contracts_Details o_2

Insurance Contracts_Details of Reinsurance Assets Included In Other Assets(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	₩ 1,205,708	₩ 740,651	₩ 695,753
Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	1,206,587	742,604	697,669
Allowances for credit losses
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	879	1,953	1,916
Non-life insurance | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	1,200,233	737,150	690,909
General Insurance | Reserve for outstanding claims | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	732,579	361,065	360,997
General Insurance | Unearned premium reserve | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	285,634	208,820	171,240
Automobile insurance | Reserve for outstanding claims | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	14,916	16,555	18,057
Automobile insurance | Unearned premium reserve | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	10,870	19,952	30,864
Long-term Insurance | Reserve for outstanding claims | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	156,234	130,758	109,751
Life insurance | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	3,032	2,047	2,360
Life insurance | Reserve for outstanding claims | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	2,081	1,639	1,912
Life insurance | Unearned premium reserve | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	951	408	448
Others | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	3,322	3,407	4,400
Others | Reserve for outstanding claims | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	2,427	2,563	3,417
Others | Unearned premium reserve | Acquisition cost
Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Reinsurance Assets	₩ 895	₩ 844	₩ 983

Insurance Contracts_The Changes

Insurance Contracts_The Changes In Reinsurance Assets Included In Other Assets(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	₩ 740,651	₩ 695,753
Net increase (decrease)	463,481	44,898
Business combination	1,576
Ending	1,205,708	740,651
Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	742,604	697,669
Net increase (decrease)	462,407	44,935
Business combination	1,576
Ending	1,206,587	742,604
Allowances for credit losses
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	1,953	1,916
Net increase (decrease)	(1,074)	37
Business combination	0
Ending	879	1,953
Non-life insurance | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	737,150	690,909
Net increase (decrease)	463,083	46,241
Business combination	0
Ending	1,200,233	737,150
General Insurance | Reserve for outstanding claims | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	361,065	360,997
Net increase (decrease)	371,514	68
Business combination	0
Ending	732,579	361,065
General Insurance | Unearned premium reserve | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	208,820	171,240
Net increase (decrease)	76,814	37,580
Business combination	0
Ending	285,634	208,820
Automobile insurance | Reserve for outstanding claims | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	16,555	18,057
Net increase (decrease)	(1,639)	(1,502)
Business combination	0
Ending	14,916	16,555
Automobile insurance | Unearned premium reserve | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	19,952	30,864
Net increase (decrease)	(9,082)	(10,912)
Business combination	0
Ending	10,870	19,952
Long-term Insurance | Reserve for outstanding claims | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	130,758	109,751
Net increase (decrease)	25,476	21,007
Business combination	0
Ending	156,234	130,758
Life insurance | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	2,047	2,360
Net increase (decrease)	(591)	(313)
Business combination	1,576
Ending	3,032	2,047
Life insurance | Reserve for outstanding claims | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	1,639	1,912
Net increase (decrease)	(564)	(273)
Business combination	1,006
Ending	2,081	1,639
Life insurance | Unearned premium reserve | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	408	448
Net increase (decrease)	(27)	(40)
Business combination	570
Ending	951	408
Others | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	3,407	4,400
Net increase (decrease)	(85)	(993)
Business combination	0
Ending	3,322	3,407
Others | Reserve for outstanding claims | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	2,563	3,417
Net increase (decrease)	(136)	(854)
Business combination	0
Ending	2,427	2,563
Others | Unearned premium reserve | Acquisition cost
Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items]
Beginning	844	983
Net increase (decrease)	51	(139)
Business combination	0
Ending	₩ 895	₩ 844

Insurance Contracts_Details O_3

Insurance Contracts_Details Of Insurance Liabilities(Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)		Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Disclosure Of Types Of Insurance Contracts Line Items [Line Items]
Liabilities Arising From Insurance Contracts	₩ 54,415,296		$ 50,101,091	₩ 34,966,683	₩ 33,412,949
Premium reserve	48,255,485	[1]		30,790,854
Reserve for outstanding claims	3,140,315			2,401,509
Unearned premium reserve	1,869,713			1,528,275
Reserve for dividend to policyholders	170,684			146,839
Reserve for distribution of earnings to policyholders	56,301			51,103
Reserve for loss compensation on participating insurance	26,908			25,874
Guarantee reserve	895,890			22,229
Value Of Business Acquired VOBA	2,698,010
Non-life insurance
Disclosure Of Types Of Insurance Contracts Line Items [Line Items]
Liabilities Arising From Insurance Contracts	29,935,945			27,803,775
Premium reserve	24,990,530	[1]		23,799,607
Reserve for outstanding claims	2,885,006			2,297,256
Unearned premium reserve	1,859,367			1,522,827
Reserve for dividend to policyholders	129,660			117,094
Reserve for distribution of earnings to policyholders	51,292			46,901
Reserve for loss compensation on participating insurance	20,090			20,090
Guarantee reserve	0			0
Life insurance
Disclosure Of Types Of Insurance Contracts Line Items [Line Items]
Liabilities Arising From Insurance Contracts	24,476,029			7,159,500
Premium reserve	23,264,955	[1]		6,991,247
Reserve for outstanding claims	252,883			101,690
Unearned premium reserve	9,450			4,603
Reserve for dividend to policyholders	41,024			29,745
Reserve for distribution of earnings to policyholders	5,009			4,202
Reserve for loss compensation on participating insurance	6,818			5,784
Guarantee reserve	895,890			22,229
Others
Disclosure Of Types Of Insurance Contracts Line Items [Line Items]
Liabilities Arising From Insurance Contracts	3,322			3,407	₩ 4,400
Premium reserve	0	[1]		0
Reserve for outstanding claims	2,426			2,563
Unearned premium reserve	896			845
Reserve for dividend to policyholders	0			0
Reserve for distribution of earnings to policyholders	0			0
Reserve for loss compensation on participating insurance	0			0
Guarantee reserve	₩ 0			₩ 0
[1]	Negative VOBA amounting to KRW 2,698,010 million is included.

Insurance Contracts_Changes I_2

Insurance Contracts_Changes In Insurance Liability(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		₩ 34,966,683		₩ 33,412,949
Net increase (decrease)	[1]	2,695,724		1,553,734
Business combination		16,752,889
Ending		54,415,296	$ 50,101,091	34,966,683
Non-life insurance
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		27,803,775
Ending		29,935,945		27,803,775
General Insurance
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		1,064,913		1,054,823
Net increase (decrease)	[1]	503,828		10,090
Business combination		0
Ending		1,568,741		1,064,913
Automobile insurance
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		1,623,846		1,492,294
Net increase (decrease)	[1]	274,026		131,552
Business combination		0
Ending		1,897,872		1,623,846
Long-term Insurance
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		25,006,078		23,386,279
Net increase (decrease)	[1]	1,356,401		1,619,799
Business combination		0
Ending		26,362,479		25,006,078
Long-term investment contract
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		108,938		110,256
Net increase (decrease)	[1]	(2,085)		(1,318)
Business combination		0
Ending		106,853		108,938
Life Insurance Contracts Member [Member]
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		7,159,500
Ending		24,476,029		7,159,500
Pure endowment insurance
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		5,236,128		5,233,491
Net increase (decrease)	[1]	318,109		2,637
Business combination		2,016,112
Ending		7,570,349		5,236,128
Death insurance
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		642,963		500,571
Net increase (decrease)	[1]	404,456		142,392
Business combination		14,658,632
Ending		15,706,051		642,963
Endowment insurance
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		1,270,855		1,621,460
Net increase (decrease)	[1]	(156,688)		(350,605)
Business combination		74,132
Ending		1,188,299		1,270,855
Group insurance
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		524		735
Net increase (decrease)	[1]	(1,021)		(211)
Business combination		0
Ending		(497)		524
Other
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning	[2]	9,031		8,640
Net increase (decrease)	[1],[2]	(1,217)		391
Business combination	[2]	4,013
Ending	[2]	11,827		9,031
Others
Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items]
Beginning		3,407		4,400
Net increase (decrease)	[1]	(85)		(993)
Business combination		0
Ending		₩ 3,322		₩ 3,407
[1]	Includes exchange differences effect and decrease in liabilities related to investment contract.
[2]	Includes reserve for distribution of earnings to policyholders and Reserve for loss compensation on participating insurance.

Insurance Contracts_Assumptions

Insurance Contracts_Assumptions And Basis For The Insurance Liability Adequacy Test(Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
General Insurance | Expense ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	10.74%	11.38%
Basis	Ratio of maintenance costs incurred to earned premiums by the types of contracts for the most recent one year	Ratio of maintenance costs incurred to earned premiums by the types of contracts for the most recent one year
General Insurance | Claim survey cost ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	4.70%	4.54%
Basis	Ratio of claim survey cost to insurance claim payments by the type of contracts for the most recent three years	Ratio of claim survey cost to insurance claim payments by the type of contracts for the most recent three years
General Insurance | Loss ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	70.74%	64.95%
Basis	Ratio of final loss incurred to earned premiums by the type of contracts for the most recent five years	Ratio of final loss incurred to earned premiums by the type of contracts for the most recent five years
Automobile insurance | Expense ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	9.00%	9.94%
Basis	Ratio of maintenance costs incurred to earned premiums by the types of collaterals for the most recent one year	Ratio of maintenance costs incurred to earned premiums by the types of collaterals for the most recent one year
Automobile insurance | Claim survey cost ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	8.40%	8.84%
Basis	Ratio of claim survey cost to insurance claim payments by the type of collaterals for the most recent three years	Ratio of claim survey cost to insurance claim payments by the type of collaterals for the most recent three years
Automobile insurance | Loss ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	78.20%	78.44%
Basis	Ratio of final loss incurred to earned premiums by the type of collaterals for the most recent five years	Ratio of final loss incurred to earned premiums by the type of collaterals for the most recent five years
Long-term Insurance | Expense ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	6.46%	6.60%
Basis	Calculated using future expense plan based on the most recent one-year experience statistics	Calculated using future expense plan based on the most recent one-year experience statistics
Long-term Insurance | Lapse ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Basis	Calculated based on the recent five-year experience statistics	Calculated based on the recent five-year experience statistics
Long-term Insurance | Lapse ratio | Bottom Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	1.48%	1.51%
Long-term Insurance | Lapse ratio | Top Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	35.44%	34.13%
Long-term Insurance | Risk Rate
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Basis	Calculated by ratio of insurance claim payments to risk premiums based on the recent seven-year experience statistics	Calculated by ratio of insurance claim payments to risk premiums based on the recent seven-year experience statistics
Long-term Insurance | Risk Rate | Bottom Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	11.90%	13.10%
Long-term Insurance | Risk Rate | Top Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	1055.20%	1037.30%
Long-term Insurance | Discount rate
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Basis	Calculated by applying interest rate scenario which is risk-free rate scenario adjusted by liquidity premium. This is presented by the Financial Supervisory Service	Calculated by applying interest rate scenario which is risk-free rate scenario adjusted by liquidity premium. This is presented by the Financial Supervisory Service
Long-term Insurance | Discount rate | Bottom Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	0.83%	1.53%
Long-term Insurance | Discount rate | Top Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	15.42%	8.34%
KB Life Insurance Co., Ltd. | Lapse ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Basis	Ratio of cancelled premiums to premiums by product group, method of payment, channel, and elapsed period, based on the most recent five-year experience statistics	Ratio of cancelled premiums to premiums by product group, method of payment, channel, and elapsed period, based on the most recent five-year experience statistics
KB Life Insurance Co., Ltd. | Lapse ratio | Bottom Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	0.00%	0.00%
KB Life Insurance Co., Ltd. | Lapse ratio | Top Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	65.50%	65.39%
KB Life Insurance Co., Ltd. | Loss ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Basis	Ratio of number of accidents to the number of holding insurances, by collateral, gender and elapsed period, based on the most recent seven-year experience statistics	Ratio of number of accidents to the number of holding insurances, by collateral, gender and elapsed period, based on the most recent seven-year experience statistics
KB Life Insurance Co., Ltd. | Loss ratio | Bottom Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	24.00%	11.00%
KB Life Insurance Co., Ltd. | Loss ratio | Top Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	156.00%	132.00%
KB Life Insurance Co., Ltd. | Discount rate
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Basis	Estimated investment yield based on the interest rate scenario provided by the Financial Supervisory Service adjusted by risk spread	Estimated investment yield based on the interest rate scenario provided by the Financial Supervisory Service adjusted by risk spread
KB Life Insurance Co., Ltd. | Discount rate | Bottom Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	0.98%	1.04%
KB Life Insurance Co., Ltd. | Discount rate | Top Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	15.33%	5.79%
Prudential Life Insurance Company of Korea Ltd. | Lapse ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Basis	Ratio of cancelled premiums to premiums by product group and elapsed period, based on the most recent five-year experience statistics
Prudential Life Insurance Company of Korea Ltd. | Lapse ratio | Bottom Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	2.00%
Prudential Life Insurance Company of Korea Ltd. | Lapse ratio | Top Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	28.00%
Prudential Life Insurance Company of Korea Ltd. | Loss ratio
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Basis	Calculated by ratio of insurance claim payments to risk premiums based on the recent five-year experience statistics
Prudential Life Insurance Company of Korea Ltd. | Loss ratio | Bottom Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	21.00%
Prudential Life Insurance Company of Korea Ltd. | Loss ratio | Top Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	312.00%
Prudential Life Insurance Company of Korea Ltd. | Discount rate
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Basis	Estimated investment yield based on the interest rate scenario provided by the Financial Supervisory Service adjusted by risk spread
Prudential Life Insurance Company of Korea Ltd. | Discount rate | Bottom Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	0.85%
Prudential Life Insurance Company of Korea Ltd. | Discount rate | Top Of Range Member
Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items]
Assumptions(%)	16.27%

Insurance Contracts_The Results

Insurance Contracts_The Results Of Liability Adequacy Test(Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Non-life insurance
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities	[1]	₩ 22,716,408	₩ 21,264,591
Estimated adequate liabilities		13,646,717	12,053,196
Shortfall(surplus)		(9,069,691)	(9,211,395)
General Insurance
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities	[1]	461,227	365,234
Estimated adequate liabilities		384,780	296,801
Shortfall(surplus)		(76,447)	(68,433)
Automobile insurance
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities	[1]	1,363,104	1,123,450
Estimated adequate liabilities		1,279,587	1,071,076
Shortfall(surplus)		(83,517)	(52,374)
Long-term Insurance
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities	[1]	20,892,077	19,775,907
Estimated adequate liabilities		11,982,350	10,685,319
Shortfall(surplus)		(8,909,727)	(9,090,588)
KB LifeI nsurance Co., Ltd. [Member]
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		6,878,076	6,559,778
Estimated adequate liabilities		6,077,382	6,117,722
Shortfall(surplus)		(800,694)	(442,056)
KB LifeI nsurance Co., Ltd. [Member] | Fixed interest type Participating
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		30,447	30,514
Estimated adequate liabilities		56,125	56,460
Shortfall(surplus)		25,678	25,946
KB LifeI nsurance Co., Ltd. [Member] | Fixed interest type Non-participating
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		395,766	180,058
Estimated adequate liabilities		12,952	45,116
Shortfall(surplus)		(382,814)	(134,892)
KB LifeI nsurance Co., Ltd. [Member] | Variable interest type Participating
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		970,376	1,037,148
Estimated adequate liabilities		991,663	1,080,830
Shortfall(surplus)		21,287	43,682
KB LifeI nsurance Co., Ltd. [Member] | Variable interest type Non-participating
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		5,508,172	5,335,572
Estimated adequate liabilities		5,141,265	5,069,047
Shortfall(surplus)		(366,907)	(266,525)
KB LifeI nsurance Co., Ltd. [Member] | Varibale type
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		(26,685)	(23,514)
Estimated adequate liabilities		(124,623)	(133,781)
Shortfall(surplus)		(97,938)	₩ (110,267)
Prudential Life Insurance Company of Korea Ltd. [Member]
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		12,204,482
Estimated adequate liabilities		9,945,741
Shortfall(surplus)		(2,258,741)
Prudential Life Insurance Company of Korea Ltd. [Member] | Fixed interest type Participating
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		75,390
Estimated adequate liabilities		83,404
Shortfall(surplus)		8,014
Prudential Life Insurance Company of Korea Ltd. [Member] | Fixed interest type Non-participating
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		11,037,531
Estimated adequate liabilities		10,534,663
Shortfall(surplus)		(502,868)
Prudential Life Insurance Company of Korea Ltd. [Member] | Variable interest type Participating
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		0
Estimated adequate liabilities		0
Shortfall(surplus)		0
Prudential Life Insurance Company of Korea Ltd. [Member] | Variable interest type Non-participating
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		721,570
Estimated adequate liabilities		547,754
Shortfall(surplus)		(173,816)
Prudential Life Insurance Company of Korea Ltd. [Member] | Varibale type
Results Of Insurance Liability Adequacy Test LineItems [Line Items]
Recognized liabilities		369,991
Estimated adequate liabilities		(1,220,080)
Shortfall(surplus)		₩ (1,590,071)
[1]	Long-term insurance is for premium reserves and unearned premium reserves; the premium reserve is the amount of subtracting deferred acquisition costs and insurance contract loans from the net insurance premium reserve in accordance with Article 6-3 of the Insurance Supervisory Regulation.

Insurance Contracts_Insurance I

Insurance Contracts_Insurance Income And Expenses(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Disclosure Of Insurance Income And Expenses
Sub-total	[1]	₩ 14,386,640	$ 13,246,025	₩ 12,317,182	₩ 11,975,070
Premium income		12,872,727		11,173,367	10,730,227
Reinsurance income		823,500		850,871	873,053
Reversal of policy reserves		85		993	344
Separate account income		216,485		216,429	360,664
Income from change in reinsurance assets		467,729		42,432	0
Other insurance income		6,114		33,090	10,782
Sub-total	[1]	14,086,647	$ 12,969,816	12,017,670	11,484,954
Insurance claims paid		5,264,829		5,046,772	4,415,760
Dividend expenses		11,661		9,902	9,400
Refunds of surrender value		3,286,150		2,870,543	2,855,573
Reinsurance expenses		1,127,304		1,018,007	947,560
Provision for policy reserves		2,709,903		1,547,264	1,608,519
Separate account expenses		113,703		139,810	276,412
Administration expenses		563,085		453,016	418,646
Amortization of deferred acquisition costs		767,633		679,279	606,073
Expenses from change in reinsurance assets		163		314	89,621
Claim survey expenses paid		58,873		52,123	38,782
Other insurance expenses		183,343		200,640	218,608
Net insurance income		₩ 299,993		₩ 299,512	₩ 490,116
[1]	The consolidated statements of comprehensive income for the years ended December 31, 2020 and 2019 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Insurance Contracts_Insurance R

Insurance Contracts_Insurance Risk Management(Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
KB Insurance Co., Ltd. | Non-life insurance
Disclosure Of Nature And Extent Of Risks Arising FromInsuranceContracts LineItems[Line Items]
Purposes, policies and procedures to manage risk arising from insurance contracts	The risks associated with insurance contract that the Group faces are the insurance actuarial risk and the acceptance risk. Each risk occurs due to insurance contract's pricing and conditions of acceptance. In order to minimize acceptance risk, the Group establishes guidelines and procedure for acceptance and outlines specific conditions for acceptance by product. In addition, expected risk level at the date of pricing is compared with actual risk of contracts after acceptance and various subsequent measures such as the adjustments in the interest rate and sales conditions, termination of selling specific product and others are taken in order to reduce insurance actuarial risk. The Group has a committee to discuss status of product acceptance risk and interest rate policy. The committee decides important matters to set the processes that allow minimizing the insurance actuarial risk, the acceptance risk and other business-related risk. In addition, according to reinsurance operating standards, the Group establishes an operating strategy of reinsurance for large claims expense due to unexpected catastrophic events. The Group aims at policy holders' safety and its stable profit achievement. For the long-term goal, the Group manages risk at a comprehensive level to keep its value at the maximum.	The risks associated with insurance contract that the Group faces are the insurance actuarial risk and the acceptance risk. Each risk occurs due to insurance contract's pricing and conditions of acceptance. In order to minimize acceptance risk, the Group establishes guidelines and procedure for acceptance and outlines specific conditions for acceptance by product. In addition, expected risk level at the date of pricing is compared with actual risk of contracts after acceptance and various subsequent measures such as the adjustments in the interest rate and sales conditions, termination of selling specific product and others are taken in order to reduce insurance actuarial risk. The Group has a committee to discuss status of product acceptance risk and interest rate policy. The committee decides important matters to set the processes that allow minimizing the insurance actuarial risk, the acceptance risk and other business-related risk. In addition, according to reinsurance operating standards, the Group establishes an operating strategy of reinsurance for large claims expense due to unexpected catastrophic events. The Group aims at policy holders' safety and its stable profit achievement. For the long-term goal, the Group manages risk at a comprehensive level to keep its value at the maximum.
KB Life Insurance Co., Ltd. | Life insurance
Disclosure Of Nature And Extent Of Risks Arising FromInsuranceContracts LineItems[Line Items]
Concentration of insurance risk and reinsurance policy	The Group uses reinsurance to mitigate concentration of insurance risk seeking an enhanced capital management. The Group categorized reinsurance into group and individual contracts, and reinsurance is ceded through the following process: (a) In the decision-making process of launching a new product, the Group decides on ceding reinsurance. Subsequently, a reinsurer is selected through bidding, agreements with the relevant departments and final approval by the executive management. (b) The reinsurance department analyses the object of reinsurance, the maximum limit of reinsurance and the loss ratio with the relevant departments.	The Group uses reinsurance to mitigate concentration of insurance risk seeking an enhanced capital management. The Group categorized reinsurance into group and individual contracts, and reinsurance is ceded through the following process: (a) In the decision-making process of launching a new product, the Group decides on ceding reinsurance. Subsequently, a reinsurer is selected through bidding, agreements with the relevant departments and final approval by the executive management. (b) The reinsurance department analyses the object of reinsurance, the maximum limit of reinsurance and the loss ratio with the relevant departments.
Prudential Life Insurance Company of Korea Ltd. | Life insurance
Disclosure Of Nature And Extent Of Risks Arising FromInsuranceContracts LineItems[Line Items]
Concentration of insurance risk and reinsurance policy	The Group uses reinsurance to mitigate concentration of insurance risk seeking an enhanced capital management. The Group categorized reinsurance into group and individual contracts, and reinsurance is ceded through the following process: (a) In the decision-making process of launching a new product, the Group decides on ceding reinsurance. Subsequently, a reinsurer is selected through bidding, agreements with the relevant departments and final approval by the executive management. (b) The reinsurance department analyses the object of reinsurance, the maximum limit of reinsurance and the loss ratio with the relevant departments.

Insurance Contracts_Exposure To

Insurance Contracts_Exposure To Non life Insurance Price Risk(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Non-life insurance
Disclosure Of Non Life Insurance Price Risk LineItems [Line Items]
Direct insurance	₩ 6,383,735	₩ 5,651,364
Reinsurance assumed	79,429	101,613
Reinsurance ceded	(1,100,622)	(987,893)
Total	5,362,542	4,765,084
General Insurance
Disclosure Of Non Life Insurance Price Risk LineItems [Line Items]
Direct insurance	1,088,791	999,348
Reinsurance assumed	79,429	101,613
Reinsurance ceded	(663,750)	(579,922)
Total	504,470	521,039
Automobile insurance
Disclosure Of Non Life Insurance Price Risk LineItems [Line Items]
Direct insurance	2,491,412	2,101,780
Reinsurance assumed	0	0
Reinsurance ceded	(21,433)	(40,067)
Total	2,469,979	2,061,713
Long-term Insurance
Disclosure Of Non Life Insurance Price Risk LineItems [Line Items]
Direct insurance	2,803,532	2,550,236
Reinsurance assumed	0	0
Reinsurance ceded	(415,439)	(367,904)
Total	₩ 2,388,093	₩ 2,182,332

Insurance Contracts_Non life Lo

Insurance Contracts_Non life Loss Development Tables(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
General Insurance | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	₩ 967,498	₩ 859,943
Gross cumulative claim payments (B)	747,072	673,573
Difference (A-B)	220,426	186,369
General Insurance | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	873,840	750,199
Gross cumulative claim payments (B)	799,967	682,086
Difference (A-B)	73,873	68,112
General Insurance | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	622,445	522,774
Gross cumulative claim payments (B)	591,739	493,027
Difference (A-B)	30,706	29,747
General Insurance | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	384,466	325,881
Gross cumulative claim payments (B)	369,578	311,571
Difference (A-B)	14,888	14,310
General Insurance | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	180,160	148,995
Gross cumulative claim payments (B)	175,063	143,985
Difference (A-B)	5,097	5,010
General Insurance | 2015.1.1 ~ 2015.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		125,162
Gross cumulative claim payments (B)		93,443
General Insurance | 2015.1.1 ~ 2015.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		144,566
Gross cumulative claim payments (B)		129,764
General Insurance | 2015.1.1 ~ 2015.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		147,031
Gross cumulative claim payments (B)		137,157
General Insurance | 2015.1.1 ~ 2015.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		147,616
Gross cumulative claim payments (B)		141,218
General Insurance | 2015.1.1 ~ 2015.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		148,995
Gross cumulative claim payments (B)		143,985
General Insurance | 2016.1.1 ~ 2016.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	145,618	145,618
Gross cumulative claim payments (B)	108,098	108,098
General Insurance | 2016.1.1 ~ 2016.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	167,818	167,818
Gross cumulative claim payments (B)	151,282	151,283
General Insurance | 2016.1.1 ~ 2016.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	171,206	171,205
Gross cumulative claim payments (B)	162,059	162,059
General Insurance | 2016.1.1 ~ 2016.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	178,265	178,265
Gross cumulative claim payments (B)	170,353	170,353
General Insurance | 2016.1.1 ~ 2016.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	180,160	0
Gross cumulative claim payments (B)	175,063	0
General Insurance | 2017.1.1 ~ 2017.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	168,409	168,409
Gross cumulative claim payments (B)	132,430	132,430
General Insurance | 2017.1.1 ~ 2017.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	200,699	200,704
Gross cumulative claim payments (B)	184,333	184,333
General Insurance | 2017.1.1 ~ 2017.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	204,368	204,538
Gross cumulative claim payments (B)	193,780	193,811
General Insurance | 2017.1.1 ~ 2017.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	206,201	0
Gross cumulative claim payments (B)	199,225	0
General Insurance | 2017.1.1 ~ 2017.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
General Insurance | 2018.1.1 ~ 2018.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	200,968	200,280
Gross cumulative claim payments (B)	153,770	153,770
General Insurance | 2018.1.1 ~ 2018.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	241,474	237,111
Gross cumulative claim payments (B)	217,955	216,705
General Insurance | 2018.1.1 ~ 2018.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	246,871	0
Gross cumulative claim payments (B)	235,900	0
General Insurance | 2018.1.1 ~ 2018.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
General Insurance | 2018.1.1 ~ 2018.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
General Insurance | 2019.1.1 ~ 2019.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	219,881	220,474
Gross cumulative claim payments (B)	185,645	185,832
General Insurance | 2019.1.1 ~ 2019.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	263,849	0
Gross cumulative claim payments (B)	246,397	0
General Insurance | 2019.1.1 ~ 2019.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
General Insurance | 2019.1.1 ~ 2019.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
General Insurance | 2019.1.1 ~ 2019.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
General Insurance | 2020.1.1 ~ 2020.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	232,622
Gross cumulative claim payments (B)	167,129
General Insurance | 2020.1.1 ~ 2020.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
General Insurance | 2020.1.1 ~ 2020.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
General Insurance | 2020.1.1 ~ 2020.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
General Insurance | 2020.1.1 ~ 2020.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Automobile insurance | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	9,706,572	9,214,176
Gross cumulative claim payments (B)	8,058,642	7,644,412
Difference (A-B)	1,647,930	1,569,764
Automobile insurance | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	8,162,238	7,698,163
Gross cumulative claim payments (B)	7,889,761	7,433,630
Difference (A-B)	272,477	264,533
Automobile insurance | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	6,589,686	6,279,145
Gross cumulative claim payments (B)	6,466,455	6,155,033
Difference (A-B)	123,231	124,112
Automobile insurance | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	5,137,820	4,949,262
Gross cumulative claim payments (B)	5,074,686	4,886,136
Difference (A-B)	63,134	63,126
Automobile insurance | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	3,779,268	3,658,627
Gross cumulative claim payments (B)	3,747,521	3,627,384
Difference (A-B)	31,747	31,243
Automobile insurance | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	2,485,525	2,394,038
Gross cumulative claim payments (B)	2,470,416	2,384,102
Difference (A-B)	15,109	9,936
Automobile insurance | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,217,006	1,180,458
Gross cumulative claim payments (B)	1,210,632	1,178,158
Difference (A-B)	6,374	2,300
Automobile insurance | 2013.1.1 ~ 2013.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		1,131,945
Gross cumulative claim payments (B)		939,569
Automobile insurance | 2013.1.1 ~ 2013.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		1,156,535
Gross cumulative claim payments (B)		1,114,063
Automobile insurance | 2013.1.1 ~ 2013.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		1,170,968
Gross cumulative claim payments (B)		1,145,110
Automobile insurance | 2013.1.1 ~ 2013.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		1,179,458
Gross cumulative claim payments (B)		1,161,624
Automobile insurance | 2013.1.1 ~ 2013.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		1,179,323
Gross cumulative claim payments (B)		1,168,617
Automobile insurance | 2013.1.1 ~ 2013.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		1,179,514
Gross cumulative claim payments (B)		1,175,681
Automobile insurance | 2013.1.1 ~ 2013.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		1,180,458
Gross cumulative claim payments (B)		1,178,158
Automobile insurance | 2014.1.1 ~ 2014.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,174,611	1,174,611
Gross cumulative claim payments (B)	969,211	969,211
Automobile insurance | 2014.1.1 ~ 2014.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,193,833	1,193,832
Gross cumulative claim payments (B)	1,150,462	1,150,462
Automobile insurance | 2014.1.1 ~ 2014.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,205,524	1,205,524
Gross cumulative claim payments (B)	1,180,953	1,180,953
Automobile insurance | 2014.1.1 ~ 2014.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,212,025	1,212,025
Gross cumulative claim payments (B)	1,196,387	1,196,387
Automobile insurance | 2014.1.1 ~ 2014.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,212,162	1,212,162
Gross cumulative claim payments (B)	1,204,580	1,204,580
Automobile insurance | 2014.1.1 ~ 2014.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,214,524	1,214,524
Gross cumulative claim payments (B)	1,208,421	1,208,421
Automobile insurance | 2014.1.1 ~ 2014.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,217,006	0
Gross cumulative claim payments (B)	1,210,632	0
Automobile insurance | 2015.1.1 ~ 2015.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,227,106	1,227,106
Gross cumulative claim payments (B)	1,020,975	1,020,975
Automobile insurance | 2015.1.1 ~ 2015.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,245,780	1,245,780
Gross cumulative claim payments (B)	1,198,241	1,198,241
Automobile insurance | 2015.1.1 ~ 2015.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,256,058	1,256,058
Gross cumulative claim payments (B)	1,228,357	1,228,357
Automobile insurance | 2015.1.1 ~ 2015.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,263,044	1,263,044
Gross cumulative claim payments (B)	1,245,779	1,245,779
Automobile insurance | 2015.1.1 ~ 2015.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,267,142	1,267,142
Gross cumulative claim payments (B)	1,254,187	1,254,187
Automobile insurance | 2015.1.1 ~ 2015.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,271,001	0
Gross cumulative claim payments (B)	1,261,995	0
Automobile insurance | 2015.1.1 ~ 2015.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2016.1.1 ~ 2016.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,276,939	1,276,939
Gross cumulative claim payments (B)	1,052,830	1,052,830
Automobile insurance | 2016.1.1 ~ 2016.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,281,381	1,281,381
Gross cumulative claim payments (B)	1,235,656	1,235,656
Automobile insurance | 2016.1.1 ~ 2016.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,287,728	1,287,728
Gross cumulative claim payments (B)	1,264,651	1,264,651
Automobile insurance | 2016.1.1 ~ 2016.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,294,735	1,294,735
Gross cumulative claim payments (B)	1,282,346	1,282,346
Automobile insurance | 2016.1.1 ~ 2016.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,299,964	0
Gross cumulative claim payments (B)	1,288,754	0
Automobile insurance | 2016.1.1 ~ 2016.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2016.1.1 ~ 2016.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2017.1.1 ~ 2017.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,342,998	1,342,998
Gross cumulative claim payments (B)	1,104,158	1,104,158
Automobile insurance | 2017.1.1 ~ 2017.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,348,828	1,348,828
Gross cumulative claim payments (B)	1,306,235	1,306,235
Automobile insurance | 2017.1.1 ~ 2017.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,358,867	1,358,867
Gross cumulative claim payments (B)	1,335,962	1,335,962
Automobile insurance | 2017.1.1 ~ 2017.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,368,016	0
Gross cumulative claim payments (B)	1,350,174	0
Automobile insurance | 2017.1.1 ~ 2017.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2017.1.1 ~ 2017.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2017.1.1 ~ 2017.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2018.1.1 ~ 2018.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,468,784	1,468,784
Gross cumulative claim payments (B)	1,224,820	1,224,820
Automobile insurance | 2018.1.1 ~ 2018.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,471,807	1,471,807
Gross cumulative claim payments (B)	1,428,973	1,428,973
Automobile insurance | 2018.1.1 ~ 2018.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,481,509	0
Gross cumulative claim payments (B)	1,456,532	0
Automobile insurance | 2018.1.1 ~ 2018.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2018.1.1 ~ 2018.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2018.1.1 ~ 2018.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2018.1.1 ~ 2018.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2019.1.1 ~ 2019.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,591,793	1,591,793
Gross cumulative claim payments (B)	1,332,849	1,332,849
Automobile insurance | 2019.1.1 ~ 2019.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,620,609	0
Gross cumulative claim payments (B)	1,570,194	0
Automobile insurance | 2019.1.1 ~ 2019.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2019.1.1 ~ 2019.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2019.1.1 ~ 2019.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2019.1.1 ~ 2019.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2019.1.1 ~ 2019.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Automobile insurance | 2020.1.1 ~ 2020.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,624,341
Gross cumulative claim payments (B)	1,353,799
Automobile insurance | 2020.1.1 ~ 2020.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Automobile insurance | 2020.1.1 ~ 2020.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Automobile insurance | 2020.1.1 ~ 2020.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Automobile insurance | 2020.1.1 ~ 2020.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Automobile insurance | 2020.1.1 ~ 2020.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Automobile insurance | 2020.1.1 ~ 2020.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Long-term Insurance | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	8,741,035	7,632,320
Gross cumulative claim payments (B)	8,373,482	7,295,335
Difference (A-B)	367,553	336,985
Long-term Insurance | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	9,465,795	8,201,550
Gross cumulative claim payments (B)	9,375,248	8,117,025
Difference (A-B)	90,547	84,525
Long-term Insurance | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	7,469,136	6,525,247
Gross cumulative claim payments (B)	7,426,879	6,483,293
Difference (A-B)	42,257	41,954
Long-term Insurance | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	5,576,258	4,890,136
Gross cumulative claim payments (B)	5,557,422	4,873,369
Difference (A-B)	18,836	16,767
Long-term Insurance | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	3,900,047	3,399,184
Gross cumulative claim payments (B)	3,892,929	3,392,803
Difference (A-B)	7,118	6,381
Long-term Insurance | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	2,396,855	2,130,281
Gross cumulative claim payments (B)	2,395,026	2,128,174
Difference (A-B)	1,829	2,107
Long-term Insurance | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,124,628	1,008,589
Gross cumulative claim payments (B)	1,123,868	1,007,865
Difference (A-B)	760	724
Long-term Insurance | 2013.1.1 ~ 2013.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		709,602
Gross cumulative claim payments (B)		671,500
Long-term Insurance | 2013.1.1 ~ 2013.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		965,587
Gross cumulative claim payments (B)		953,494
Long-term Insurance | 2013.1.1 ~ 2013.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		997,607
Gross cumulative claim payments (B)		989,957
Long-term Insurance | 2013.1.1 ~ 2013.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		1,003,646
Gross cumulative claim payments (B)		999,944
Long-term Insurance | 2013.1.1 ~ 2013.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		1,006,025
Gross cumulative claim payments (B)		1,003,715
Long-term Insurance | 2013.1.1 ~ 2013.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		1,007,041
Gross cumulative claim payments (B)		1,005,796
Long-term Insurance | 2013.1.1 ~ 2013.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)		1,008,589
Gross cumulative claim payments (B)		1,007,865
Long-term Insurance | 2014.1.1 ~ 2014.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	789,088	789,087
Gross cumulative claim payments (B)	744,944	744,944
Long-term Insurance | 2014.1.1 ~ 2014.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,083,049	1,083,048
Gross cumulative claim payments (B)	1,065,792	1,065,792
Long-term Insurance | 2014.1.1 ~ 2014.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,114,820	1,114,821
Gross cumulative claim payments (B)	1,104,468	1,104,468
Long-term Insurance | 2014.1.1 ~ 2014.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,119,206	1,119,206
Gross cumulative claim payments (B)	1,114,341	1,114,341
Long-term Insurance | 2014.1.1 ~ 2014.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,122,191	1,122,192
Gross cumulative claim payments (B)	1,119,531	1,119,531
Long-term Insurance | 2014.1.1 ~ 2014.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,123,240	1,123,240
Gross cumulative claim payments (B)	1,122,378	1,122,378
Long-term Insurance | 2014.1.1 ~ 2014.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,124,628	0
Gross cumulative claim payments (B)	1,123,868	0
Long-term Insurance | 2015.1.1 ~ 2015.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	885,476	885,476
Gross cumulative claim payments (B)	836,471	836,471
Long-term Insurance | 2015.1.1 ~ 2015.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,219,394	1,219,393
Gross cumulative claim payments (B)	1,205,130	1,205,130
Long-term Insurance | 2015.1.1 ~ 2015.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,256,051	1,256,051
Gross cumulative claim payments (B)	1,248,475	1,248,475
Long-term Insurance | 2015.1.1 ~ 2015.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,266,881	1,266,881
Gross cumulative claim payments (B)	1,262,528	1,262,528
Long-term Insurance | 2015.1.1 ~ 2015.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,270,967	1,270,967
Gross cumulative claim payments (B)	1,269,557	1,269,557
Long-term Insurance | 2015.1.1 ~ 2015.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,273,615	0
Gross cumulative claim payments (B)	1,272,648	0
Long-term Insurance | 2015.1.1 ~ 2015.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2016.1.1 ~ 2016.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,064,744	1,064,744
Gross cumulative claim payments (B)	1,017,243	1,017,243
Long-term Insurance | 2016.1.1 ~ 2016.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,437,573	1,437,573
Gross cumulative claim payments (B)	1,424,948	1,424,948
Long-term Insurance | 2016.1.1 ~ 2016.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,485,839	1,485,839
Gross cumulative claim payments (B)	1,477,415	1,477,415
Long-term Insurance | 2016.1.1 ~ 2016.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,500,403	1,500,403
Gross cumulative claim payments (B)	1,496,556	1,496,556
Long-term Insurance | 2016.1.1 ~ 2016.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,506,889	0
Gross cumulative claim payments (B)	1,503,841	0
Long-term Insurance | 2016.1.1 ~ 2016.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2016.1.1 ~ 2016.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2017.1.1 ~ 2017.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,184,224	1,184,224
Gross cumulative claim payments (B)	1,130,868	1,130,868
Long-term Insurance | 2017.1.1 ~ 2017.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,614,903	1,614,903
Gross cumulative claim payments (B)	1,599,227	1,599,227
Long-term Insurance | 2017.1.1 ~ 2017.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,670,929	1,670,929
Gross cumulative claim payments (B)	1,662,978	1,682,978
Long-term Insurance | 2017.1.1 ~ 2017.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,689,768	0
Gross cumulative claim payments (B)	1,683,997	0
Long-term Insurance | 2017.1.1 ~ 2017.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2017.1.1 ~ 2017.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2017.1.1 ~ 2017.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2018.1.1 ~ 2018.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,372,706	1,372,706
Gross cumulative claim payments (B)	1,319,613	1,319,613
Long-term Insurance | 2018.1.1 ~ 2018.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,881,046	1,881,046
Gross cumulative claim payments (B)	1,868,434	1,868,434
Long-term Insurance | 2018.1.1 ~ 2018.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,941,497	0
Gross cumulative claim payments (B)	1,933,543	0
Long-term Insurance | 2018.1.1 ~ 2018.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2018.1.1 ~ 2018.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2018.1.1 ~ 2018.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2018.1.1 ~ 2018.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2019.1.1 ~ 2019.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,626,481	1,626,481
Gross cumulative claim payments (B)	1,574,696	1,574,696
Long-term Insurance | 2019.1.1 ~ 2019.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	2,229,830	0
Gross cumulative claim payments (B)	2,211,717	0
Long-term Insurance | 2019.1.1 ~ 2019.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2019.1.1 ~ 2019.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2019.1.1 ~ 2019.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2019.1.1 ~ 2019.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	0
Long-term Insurance | 2019.1.1 ~ 2019.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0	0
Gross cumulative claim payments (B)	0	₩ 0
Long-term Insurance | 2020.1.1 ~ 2020.12.31 | After 1 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	1,818,316
Gross cumulative claim payments (B)	1,749,647
Long-term Insurance | 2020.1.1 ~ 2020.12.31 | After 2 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Long-term Insurance | 2020.1.1 ~ 2020.12.31 | After 3 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Long-term Insurance | 2020.1.1 ~ 2020.12.31 | After 4 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Long-term Insurance | 2020.1.1 ~ 2020.12.31 | After 5 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Long-term Insurance | 2020.1.1 ~ 2020.12.31 | After 6 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	0
Long-term Insurance | 2020.1.1 ~ 2020.12.31 | After 7 year
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items]
Estimate of gross ultimate claims (A)	0
Gross cumulative claim payments (B)	₩ 0

Insurance Contracts_Sensitivity

Insurance Contracts_Sensitivity Analysis Of Non life Insurance Risk(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
KB Insurance Co., Ltd. | Non-life insurance | Lapse ratio | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(10.00%)	(10.00%)
Effect on LAT	₩ (633,788)	₩ (553,013)
KB Insurance Co., Ltd. | Non-life insurance | Lapse ratio | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	10.00%	10.00%
Effect on LAT	₩ 568,734	₩ 495,287
KB Insurance Co., Ltd. | Non-life insurance | Loss ratio | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(10.00%)	(10.00%)
Effect on LAT	₩ (5,012,443)	₩ (4,576,415)
KB Insurance Co., Ltd. | Non-life insurance | Loss ratio | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	10.00%	10.00%
Effect on LAT	₩ 5,012,443	₩ 4,576,415
KB Insurance Co., Ltd. | Non-life insurance | Expense ratio | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(10.00%)	(10.00%)
Effect on LAT	₩ (345,752)	₩ (342,587)
KB Insurance Co., Ltd. | Non-life insurance | Expense ratio | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	10.00%	10.00%
Effect on LAT	₩ 345,752	₩ 342,587
KB Insurance Co., Ltd. | Non-life insurance | Discount rate | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(0.50%)	(0.50%)
Effect on LAT	₩ 1,726,707	₩ 1,800,472
KB Insurance Co., Ltd. | Non-life insurance | Discount rate | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	0.50%	0.50%
Effect on LAT	₩ (1,499,565)	₩ (1,521,385)
KB Life Insurance Co., Ltd. | Life insurance | Lapse ratio | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(10.00%)	(10.00%)
Effect on LAT	₩ (76,265)	₩ (52,877)
KB Life Insurance Co., Ltd. | Life insurance | Lapse ratio | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	10.00%	10.00%
Effect on LAT	₩ 68,714	₩ 47,615
KB Life Insurance Co., Ltd. | Life insurance | Claim ratio | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(10.00%)	(10.00%)
Effect on LAT	₩ (31,600)	₩ (23,308)
KB Life Insurance Co., Ltd. | Life insurance | Claim ratio | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	10.00%	10.00%
Effect on LAT	₩ 30,594	₩ 22,675
KB Life Insurance Co., Ltd. | Life insurance | Expense ratio | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(10.00%)	(10.00%)
Effect on LAT	₩ (33,020)	₩ (32,068)
KB Life Insurance Co., Ltd. | Life insurance | Expense ratio | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	10.00%	10.00%
Effect on LAT	₩ 33,020	₩ 32,068
KB Life Insurance Co., Ltd. | Life insurance | Discount rate | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(0.50%)	(0.50%)
Effect on LAT	₩ 477,556	₩ 441,585
KB Life Insurance Co., Ltd. | Life insurance | Discount rate | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	0.50%	0.50%
Effect on LAT	₩ (424,309)	₩ (388,848)
Prudential Life Insurance Company of Korea Ltd. | Life insurance | Lapse ratio | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(10.00%)
Effect on LAT	₩ (182,654)
Prudential Life Insurance Company of Korea Ltd. | Life insurance | Lapse ratio | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	10.00%
Effect on LAT	₩ 167,536
Prudential Life Insurance Company of Korea Ltd. | Life insurance | Claim ratio | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(10.00%)
Effect on LAT	₩ (665,990)
Prudential Life Insurance Company of Korea Ltd. | Life insurance | Claim ratio | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	10.00%
Effect on LAT	₩ 644,798
Prudential Life Insurance Company of Korea Ltd. | Life insurance | Expense ratio | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(10.00%)
Effect on LAT	₩ (135,587)
Prudential Life Insurance Company of Korea Ltd. | Life insurance | Expense ratio | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	10.00%
Effect on LAT	₩ 135,587
Prudential Life Insurance Company of Korea Ltd. | Life insurance | Discount rate | Bottom Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	(0.50%)
Effect on LAT	₩ 1,426,726
Prudential Life Insurance Company of Korea Ltd. | Life insurance | Discount rate | Top Of Range Member
Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items]
Assumption change	0.50%
Effect on LAT	₩ (1,245,727)

Insurance Contracts_Liquidity R

Insurance Contracts_Liquidity Risk Of Non life Insurance Contracts(Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Non-life insurance
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	₩ 25,012,766	₩ 23,818,981
Non-life insurance | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	574,527	576,666
Non-life insurance | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	24,438,239	23,242,315
Long-term insurance non-participating
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	21,034,333	19,873,613
Long-term insurance non-participating | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	567,047	569,080
Long-term insurance non-participating | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	20,467,286	19,304,533
Annuity
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	3,978,433	3,917,979
Annuity | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	7,480	7,586
Annuity | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	3,970,953	3,910,393
Asset-linked | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	0	27,389
Up to 1 year | Non-life insurance
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	734,239	612,671
Up to 1 year | Non-life insurance | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	70,787	57,542
Up to 1 year | Non-life insurance | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	663,452	555,129
Up to 1 year | Long-term insurance non-participating
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	733,992	584,999
Up to 1 year | Long-term insurance non-participating | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	70,782	57,532
Up to 1 year | Long-term insurance non-participating | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	663,210	527,467
Up to 1 year | Annuity
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	247	283
Up to 1 year | Annuity | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	5	10
Up to 1 year | Annuity | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	242	273
Up to 1 year | Asset-linked | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	0	27,389
1~5 years | Non-life insurance
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,580,153	2,907,163
1~5 years | Non-life insurance | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	192,287	258,979
1~5 years | Non-life insurance | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,387,866	2,648,184
1~5 years | Long-term insurance non-participating
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,495,868	2,836,440
1~5 years | Long-term insurance non-participating | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	191,570	258,436
1~5 years | Long-term insurance non-participating | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,304,298	2,578,004
1~5 years | Annuity
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	84,285	70,723
1~5 years | Annuity | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	717	543
1~5 years | Annuity | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	83,568	70,180
1~5 years | Asset-linked | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	0	0
5~10 years | Non-life insurance
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,408,432	2,539,357
5~10 years | Non-life insurance | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	80,295	86,593
5~10 years | Non-life insurance | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,328,137	2,452,764
5~10 years | Long-term insurance non-participating
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,015,713	2,169,403
5~10 years | Long-term insurance non-participating | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	78,092	84,349
5~10 years | Long-term insurance non-participating | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	1,937,621	2,085,054
5~10 years | Annuity
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	392,719	369,954
5~10 years | Annuity | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,203	2,244
5~10 years | Annuity | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	390,516	367,710
5~10 years | Asset-linked | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	0	0
10~20 years | Non-life insurance
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,201,820	2,069,371
10~20 years | Non-life insurance | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	55,033	46,855
10~20 years | Non-life insurance | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,146,787	2,022,516
10~20 years | Long-term insurance non-participating
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	896,620	820,481
10~20 years | Long-term insurance non-participating | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	51,216	43,141
10~20 years | Long-term insurance non-participating | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	845,404	777,340
10~20 years | Annuity
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	1,305,200	1,248,890
10~20 years | Annuity | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	3,817	3,714
10~20 years | Annuity | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	1,301,383	1,245,176
10~20 years | Asset-linked | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	0	0
Over 20 years | Non-life insurance
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	17,088,122	15,690,419
Over 20 years | Non-life insurance | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	176,125	126,697
Over 20 years | Non-life insurance | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	16,911,997	15,563,722
Over 20 years | Long-term insurance non-participating
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	14,892,140	13,462,290
Over 20 years | Long-term insurance non-participating | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	175,387	125,622
Over 20 years | Long-term insurance non-participating | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	14,716,753	13,336,668
Over 20 years | Annuity
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,195,982	2,228,129
Over 20 years | Annuity | Fixed interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	738	1,075
Over 20 years | Annuity | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	2,195,244	2,227,054
Over 20 years | Asset-linked | Variable interest type
Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items]
Premuim Reserve	[1]	₩ 0	₩ 0
[1]	Includes long-term investment contract amounting to KRW 108,938 million and KRW 106,853 million, as of December 31, 2019 and 2020, respectively.

Insurance Contracts_Credit Risk

Insurance Contracts_Credit Risk Reinsurance Companies That Deal With The Group(Details) - Non-life insurance - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Ceded Credit Risk LineItems[Line Items]
Reinsurance assets	[1]	₩ 1,199,354	₩ 735,196
Receivables from reinsurers	[2]	252,064	328,177
Total		₩ 1,451,418	₩ 1,063,373
KOREAN RE | AA
Ceded Credit Risk LineItems[Line Items]
Ratio		48.02%
MUNICH RE | AAA
Ceded Credit Risk LineItems[Line Items]
Ratio		3.94%
ALLIANZ GLOBAL | AAA
Ceded Credit Risk LineItems[Line Items]
Ratio		3.85%
[1]	Net carrying amounts after impairment loss
[2]	Net carrying amounts after allowance for credit losses

Insurance Contracts_Exposure _2

Insurance Contracts_Exposure To Interest Rate Risk(Details) - Non-life insurance - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financial assets
Disclosure Of Interest Risk Of Non Life Insurance Contract LineItems[Line Items]
Exposure To Interest Rate Risk	₩ 22,939,099	₩ 22,741,891
Due from financial institutions measured at amortized cost and cash equivalents
Disclosure Of Interest Risk Of Non Life Insurance Contract LineItems[Line Items]
Exposure To Interest Rate Risk	160,249	108,559
Financial assets at fair value through profit or loss
Disclosure Of Interest Risk Of Non Life Insurance Contract LineItems[Line Items]
Exposure To Interest Rate Risk	3,823,603	4,560,512
Financial assets at fair value through other comprehensive income
Disclosure Of Interest Risk Of Non Life Insurance Contract LineItems[Line Items]
Exposure To Interest Rate Risk	3,983,567	2,984,738
Securities measured at amortized cost
Disclosure Of Interest Risk Of Non Life Insurance Contract LineItems[Line Items]
Exposure To Interest Rate Risk	8,700,196	8,163,485
Loans measured at amortized cost
Disclosure Of Interest Risk Of Non Life Insurance Contract LineItems[Line Items]
Exposure To Interest Rate Risk	6,271,484	6,924,597
Financial liabilities
Disclosure Of Interest Risk Of Non Life Insurance Contract LineItems[Line Items]
Exposure To Interest Rate Risk	23,714,814	22,445,629
Fixed interest rate type
Disclosure Of Interest Risk Of Non Life Insurance Contract LineItems[Line Items]
Exposure To Interest Rate Risk	501,147	534,236
Variable interest rate type
Disclosure Of Interest Risk Of Non Life Insurance Contract LineItems[Line Items]
Exposure To Interest Rate Risk	₩ 23,213,667	₩ 21,911,393

Insurance Contracts_The Maximum

Insurance Contracts_The Maximum Exposures To Insurance Price Risk(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
KB Life Insurance Co., Ltd. | Life insurance
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	₩ 22,343	₩ 21,434
After reinsurance mitigation	₩ 13,825	₩ 13,117
Average Ratios Of Insurance Claims Paid Per Risk Premium Received OnThe Basis Of Exposure Before Mitigation	65.10%	65.70%
KB Life Insurance Co., Ltd. | Death
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	₩ 13,509	₩ 12,882
After reinsurance mitigation	10,409	9,033
KB Life Insurance Co., Ltd. | Disability
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	672	754
After reinsurance mitigation	349	424
KB Life Insurance Co., Ltd. | Hospitalization
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	1,213	1,260
After reinsurance mitigation	787	642
KB Life Insurance Co., Ltd. | Operation and diagnosis
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	4,809	4,419
After reinsurance mitigation	1,783	2,211
KB Life Insurance Co., Ltd. | Actual medical expense
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	1,095	1,053
After reinsurance mitigation	23	396
KB Life Insurance Co., Ltd. | Others
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	1,045	1,066
After reinsurance mitigation	474	₩ 411
Prudential Life Insurance Company of Korea Ltd. | Life insurance
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	366,601
After reinsurance mitigation	₩ 359,936
Average Ratios Of Insurance Claims Paid Per Risk Premium Received OnThe Basis Of Exposure Before Mitigation	51.97%
Prudential Life Insurance Company of Korea Ltd. | Death
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	₩ 244,975
After reinsurance mitigation	240,121
Prudential Life Insurance Company of Korea Ltd. | Disability
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	10,485
After reinsurance mitigation	9,964
Prudential Life Insurance Company of Korea Ltd. | Hospitalization
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	33,321
After reinsurance mitigation	33,321
Prudential Life Insurance Company of Korea Ltd. | Operation and diagnosis
Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items]
Before reinsurance mitigation	77,820
After reinsurance mitigation	₩ 76,530

Insurance Contracts_The Exposur

Insurance Contracts_The Exposure Of Market Risk Arising From Embedded Derivatives Included In Host Insurance Contracts(Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
KB Life Insurance Co., Ltd. | Total
Details Of Exposure Of Market Risk Arising From Embeded Derivatives Included In Host Insurance Contracts Line Items [Line Items]
Policyholders' reserve	[1]	₩ 1,301,085	₩ 1,256,619
Guarantee reserve		5,801	6,176
KB Life Insurance Co., Ltd. | Variable annuity
Details Of Exposure Of Market Risk Arising From Embeded Derivatives Included In Host Insurance Contracts Line Items [Line Items]
Policyholders' reserve	[1]	490,551	429,970
Guarantee reserve		2,782	2,565
KB Life Insurance Co., Ltd. | Variable universal
Details Of Exposure Of Market Risk Arising From Embeded Derivatives Included In Host Insurance Contracts Line Items [Line Items]
Policyholders' reserve	[1]	90,337	91,988
Guarantee reserve		2,515	3,095
KB Life Insurance Co., Ltd. | Variable saving
Details Of Exposure Of Market Risk Arising From Embeded Derivatives Included In Host Insurance Contracts Line Items [Line Items]
Policyholders' reserve	[1]	720,197	734,661
Guarantee reserve		504	₩ 516
Prudential Life Insurance Company of Korea Ltd. | Total
Details Of Exposure Of Market Risk Arising From Embeded Derivatives Included In Host Insurance Contracts Line Items [Line Items]
Policyholders' reserve	[1]	4,720,597
Guarantee reserve		862,157
Prudential Life Insurance Company of Korea Ltd. | Variable whole life
Details Of Exposure Of Market Risk Arising From Embeded Derivatives Included In Host Insurance Contracts Line Items [Line Items]
Policyholders' reserve	[1]	241,955
Guarantee reserve		112,620
Prudential Life Insurance Company of Korea Ltd. | Variable annuity
Details Of Exposure Of Market Risk Arising From Embeded Derivatives Included In Host Insurance Contracts Line Items [Line Items]
Policyholders' reserve	[1]	2,487,715
Guarantee reserve		30,306
Prudential Life Insurance Company of Korea Ltd. | Variable Universal (Protection)
Details Of Exposure Of Market Risk Arising From Embeded Derivatives Included In Host Insurance Contracts Line Items [Line Items]
Policyholders' reserve	[1]	1,544,241
Guarantee reserve		718,783
Prudential Life Insurance Company of Korea Ltd. | Variable Universal (Savings)
Details Of Exposure Of Market Risk Arising From Embeded Derivatives Included In Host Insurance Contracts Line Items [Line Items]
Policyholders' reserve	[1]	446,686
Guarantee reserve		₩ 448
[1]	Excludes the amount of the lapsed reserve.

Insurance Contracts_Life Insura

Insurance Contracts_Life Insurance Premium Reserves And Unearned Premium Reserves Residual Maturitys(Details) - Life insurance - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
KB Life Insurance Co., Ltd.
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	₩ 7,329,738	₩ 6,991,247
KB Life Insurance Co., Ltd. | Up to 3 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	739,485	984,945
KB Life Insurance Co., Ltd. | 3-5 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	350,639	280,733
KB Life Insurance Co., Ltd. | 5~10 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	605,931	665,241
KB Life Insurance Co., Ltd. | 10-15 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	412,563	525,699
KB Life Insurance Co., Ltd. | 15-20 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	451,074	345,664
KB Life Insurance Co., Ltd. | Over 20 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	4,770,046	₩ 4,188,965
Prudential Life Insurance Company of Korea Ltd.
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	13,237,208
Prudential Life Insurance Company of Korea Ltd. | Up to 3 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	48,807
Prudential Life Insurance Company of Korea Ltd. | 3-5 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	37,502
Prudential Life Insurance Company of Korea Ltd. | 5~10 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	139,973
Prudential Life Insurance Company of Korea Ltd. | 10-15 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	215,470
Prudential Life Insurance Company of Korea Ltd. | 15-20 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	418,684
Prudential Life Insurance Company of Korea Ltd. | Over 20 years
Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items]
Premium reserve	₩ 12,376,772

Insurance Contracts_Details o_4

Insurance Contracts_Details of financial assets applied The Overlay Approach(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Financial assets at fair value through profit or loss
Disclosure of financial assets to which overlay approach is applied [Line Items]
Financial assets to which overlay approach is applied	₩ 7,739,106	₩ 8,174,427
Due from financial institutions
Disclosure of financial assets to which overlay approach is applied [Line Items]
Financial assets to which overlay approach is applied	70,312	166,891
Debt securities
Disclosure of financial assets to which overlay approach is applied [Line Items]
Financial assets to which overlay approach is applied	7,363,457	7,955,286
Equity securities
Disclosure of financial assets to which overlay approach is applied [Line Items]
Financial assets to which overlay approach is applied	₩ 305,337	₩ 52,250

Insurance Contracts_Changes of

Insurance Contracts_Changes of net losses on overlay adjustment(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Changes Of Net Losses On Overlay Adjustment [Abstract]
Beginning	₩ 187,077	₩ (7,146)
Recognition of other comprehensive income due to acquisition and valuation	177,500	196,110
Raclassification to profit or loss due te disposal	(25,375)	(1,887)
Ending	₩ 339,202	₩ 187,077

Statement of Cash Flows_Cash An

Statement of Cash Flows_Cash And Cash Equivalents(Details) $ in Thousands, ₩ in Millions		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2019USD ($)	Dec. 31, 2018KRW (₩)	Dec. 31, 2017KRW (₩)
Cash And Cash Equivalents If Different From Statement Of Financial Position Abstract [Abstract]
Cash		₩ 2,560,970		₩ 2,311,418
Checks with other banks		327,781		383,500
Due from the Bank of Korea		12,340,532		8,607,911
Due from other financial institutions		10,379,559		9,535,049
Sub-total		25,608,842	$ 23,578,497	20,837,878
Due from financial institutions measured at fair value through profit or loss		100,094		216,367
Sub-total		25,708,936		21,054,245
Restricted due from financial institutions		(15,303,363)		(13,372,966)
Due from financial institutions with original maturities over three monthes		(1,720,481)		(1,557,554)
Sub-total		(17,023,844)		(14,930,520)
Total	[1]	₩ 8,685,092	$ 7,996,510	₩ 6,123,725	$ 5,638,218	₩ 6,642,816	₩ 8,404,898
[1]	The consolidated statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.

Statement of Cash Flows_Signifi

Statement of Cash Flows_Significant Noncash Transactions(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Significant Non Cash Transactions Abstract [Abstract]
Decrease in loans due to write-offs	₩ 1,283,071	₩ 1,188,584	₩ 1,079,435
Changes in accumulated other comprehensive income from valuation of financial instruments at fair value through other comprehensive income	496,159	35,490	119,182
Changes in accumulated other comprehensive income from valuation of investments in associates	(6,978)	7,695	(3,733)
Changes in other payables due to treasury stock trust agreement, etc.	0	0	6,678
Changes in financial instruments due to debt-for-equity swap	₩ 13,820	₩ 104,815	₩ 22,286

Statement of Cash Flows_Cash In

Statement of Cash Flows_Cash Inflows And Outflows From Income Tax Interests And Dividends(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Inflows And Outflows From Income Tax Interests And Dividends Abstract [Abstract]
Income Taxes Paid Refund Classified As Operating Activities	₩ 1,119,252	₩ 1,223,084	₩ 759,013
Interest Received Classified As Operating Activities	14,986,532	14,936,705	13,958,806
Interest Paid Classified As Operating Activities	5,266,158	5,365,595	4,369,345
Dividends Received Classified As Operating Activities	187,699	185,846	235,243
Dividends Paid Classified As Financing Activities	₩ 883,952	₩ 766,249	₩ 766,728

Statement of Cash Flows_Changes

Statement of Cash Flows_Changes In Liabilities Arising From Financing Activities(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning		₩ 95,611,967		₩ 91,752,926
Changes in liabilities arising from financing activities [Abstract]
Net cash flows		24,849,445		2,918,969
Non-cash changes
Acquisition(Disposal)		236,860		766,259
Exchange differences		(68,893)		433,507
Changes in fair value		(581,066)		207,068
Subsidiaries		2,132,683		(602,388)
Others		(230,536)		135,626
Ending		121,950,460		95,611,967
Net cash flows from the change in subsidiaries	[1]	(1,951,245)	$ (1,796,545)
Derivatives held for hedging
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning	[2]	187,101		8,049
Changes in liabilities arising from financing activities [Abstract]
Net cash flows	[2]	(16,202)		(28,631)
Non-cash changes
Acquisition(Disposal)	[2]	0		0
Exchange differences	[2]	(102,347)		0
Changes in fair value	[2]	10,553		139,771
Subsidiaries	[2]	1,166		0
Others	[2]	(137,467)		67,912
Ending	[2]	(57,196)		187,101
Borrowings
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning		88,754,443		86,283,531
Changes in liabilities arising from financing activities [Abstract]
Net cash flows		22,627,875		2,537,391
Non-cash changes
Acquisition(Disposal)		0		0
Exchange differences		(217,461)		397,571
Changes in fair value		(591,619)		67,297
Subsidiaries		2,131,517		(602,388)
Others		(116,912)		71,041
Ending		112,587,843		88,754,443
Due to trust accounts
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning		5,216,460		5,285,108
Changes in liabilities arising from financing activities [Abstract]
Net cash flows		2,326,495		(68,648)
Non-cash changes
Acquisition(Disposal)		0		0
Exchange differences		0		0
Changes in fair value		0		0
Subsidiaries		0		0
Others		0		0
Ending		7,542,955		5,216,460
Changes in non-controlling interests
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning		585,407		9,110
Changes in liabilities arising from financing activities [Abstract]
Net cash flows		(25,658)		574,580
Non-cash changes
Acquisition(Disposal)		0		0
Exchange differences		250,904		345
Changes in fair value		0		0
Subsidiaries		0		0
Others		47,130		1,372
Ending		857,783		585,407
Others
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning		868,556		167,128
Changes in liabilities arising from financing activities [Abstract]
Net cash flows		(63,065)		(95,723)
Non-cash changes
Acquisition(Disposal)		236,860		766,259
Exchange differences		11		35,591
Changes in fair value		0		0
Subsidiaries		0		0
Others		(23,287)		(4,699)
Ending		₩ 1,019,075		₩ 868,556
[1]	The consolidated statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	Derivatives held for hedging purposes are the net amount after offsetting liabilities from assets.

Contingent Liabilities and Co_3

Contingent Liabilities and Commitments_Details Of Payment Guarantees(Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)	Dec. 31, 2019KRW (₩)
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	₩ 9,306,787	₩ 9,243,243
Contingent Liability For Commitments	163,340,592	154,729,256
Confirmed acceptances and guarantees
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	6,867,686	6,743,238
Confirmed acceptances and guarantees in Korean won
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	1,193,305	908,137
Acceptances and guarantees for KB purchasing loan
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	144,457	161,314
Others
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	1,048,848	746,823
Confirmed acceptances and guarantees in foreign currencies
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	4,916,522	4,919,352
Acceptances of letter of credit
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	221,422	155,151
Letter of guarantees
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	45,693	49,754
Bio bond
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	72,037	37,765
Performance bond
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	703,826	718,097
Refund guarantees
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	801,445	1,022,646
Others
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	3,072,099	2,935,939
Financail guarantees
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	757,859	915,749
Acceptances and guarantees for issuance of debenture
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	10,040	0
Acceptances and guarantees for mortgage
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	89,302	47,384
Overseas debt guarantees
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	410,470	406,680
International financing guarantees in foreign currencies
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	197,097	231,685
Others
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	50,950	230,000
Unconfirmed acceptances and guarantees
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	2,439,101	2,500,005
Guarantees of letter of credit
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	2,094,989	1,845,508
Refund guarantees
Disclosure Of Contingent Liabilities Line Items [Line Items]
Estimated Financial Effect Of Contingent Liabilities	344,112	654,497
Commitments
Disclosure Of Contingent Liabilities Line Items [Line Items]
Contingent Liability For Commitments	159,133,983	151,797,615
Corporate loan commitments
Disclosure Of Contingent Liabilities Line Items [Line Items]
Contingent Liability For Commitments	40,253,100	41,930,407
Retail loan commitments
Disclosure Of Contingent Liabilities Line Items [Line Items]
Contingent Liability For Commitments	46,450,857	42,582,736
Credit line on credit cards
Disclosure Of Contingent Liabilities Line Items [Line Items]
Contingent Liability For Commitments	65,325,863	60,667,219
Purchase of other securities
Disclosure Of Contingent Liabilities Line Items [Line Items]
Contingent Liability For Commitments	7,104,163	6,617,253
Financial Guarantees
Disclosure Of Contingent Liabilities Line Items [Line Items]
Contingent Liability For Commitments	4,206,609	2,931,641
Credit line
Disclosure Of Contingent Liabilities Line Items [Line Items]
Contingent Liability For Commitments	3,522,809	2,340,141
Purchase of securities
Disclosure Of Contingent Liabilities Line Items [Line Items]
Contingent Liability For Commitments	₩ 683,800	₩ 591,500
Law Suits As Plaintiff In The Normal Course Of The Business
Disclosure Of Contingent Liabilities Line Items [Line Items]
Loss Contingency Pending Claims Number	122
Estimated Financial Effect Of Contingent Assets	₩ 396,881
Law Suits As Defendant In The Normal Course Of The Business
Disclosure Of Contingent Liabilities Line Items [Line Items]
Loss Contingency Pending Claims Number	275
Loss Contingency Damages Sought Value	₩ 2,009,603
Law Suits Cyber Incident
Disclosure Of Contingent Liabilities Line Items [Line Items]
Loss Contingency Pending Claims Number	2	11
Loss Contingency Damages Sought Value	₩ 108	₩ 444
Loss Contingency Accrual At Carrying Value		₩ 2,549
Restriction period for the disposal of KB KOLAO LEASING Co., LTD equity
Disclosure Of Contingent Liabilities Line Items [Line Items]
Explanation Of Possibility Of Reimbursement Contingent Liabilities	As of December 31, 2020, the Group is not able to dispose, transfer or collateralize the shares or rights of shares of KB KOLAO Leasing Co., LTD. ("joint-venture lease company") to a third party without the written consent of both KB Kookmin Card Co., Ltd. and Kolao Holdings, for five years (the restriction period for the disposal of its equity) after the date of initial investment for KB KOLAO LEASING CO., LTD. However, KB Kookmin Card Co., Ltd. and KB Capital Co., Ltd. may transfer all or part of their shares in the joint-venture lease company to affiliates who agree to comply with all the terms and conditions of this agreement on the establishment and operation of the joint-venture lease company in Laos and agree to succeed their responsibility for the joint-venture lease company. After the expiration of the restriction period for the disposal, as prescribed separately, each party of the joint-venture lease company may transfer all or part of their shares. Meanwhile, KB KOLAO Leasing Co., LTD. is selling LVMC Holdings (formerly Kolao Holdings) allied receivables that are more than three months overdue to Lanexang Leasing Co., Ltd. in accordance with an agreement.
Law Suits as invest in rental apartment of disables in Australia
Disclosure Of Contingent Liabilities Line Items [Line Items]
Explanation Of Possibility Of Reimbursement Contingent Liabilities	KB Securities Co., Ltd., as a sales agency, sold KRW 326,500 million of private equity funds and trusts, which loans to corporations (borrower) that invest in apartment rental businesses for the disabled in Australia, to individuals and institutional investors. However, management of the fund is impossible due to the breach of contract by local borrower in Australia, therefore there is a possibility of losses of principal to these funds subscribers. In this regard, there are three lawsuits in which the Group is the defendant as of December 31, 2020. There is a possibility that additional lawsuits will be filed in the future, but the magnitude and final outcome of the lawsuit are unpredictable.
Contract related to Lime Asset Management
Disclosure Of Contingent Liabilities Line Items [Line Items]
Explanation Of Possibility Of Reimbursement Contingent Liabilities	In relation to Lime Asset Management, KB Securities Co., Ltd. has a PIS (Portfolio Index Swap) contract, as of December 31, 2020, associated with 'Lime Thetis Qualified Investor Private Investment Trust No.2' and Lime Pluto FI Qualified Investor Private Investment Trust No.D-1' whose redemption were suspended during the fourth quarter of 2019. The notional amount of the underlying assets of the PIS contract is KRW 298,500 million. Meanwhile, the Group sold KRW 68,100 million of feeder fund of aforementioned redemption-suspended funds. On October 20, 2020, Lime Asset Management's license as a fund manager was revoked by the Financial Supervisory Service's sanctions review committee, and most of its redemption-suspended funds and normal funds will be transferred to Wellbridge Asset Management (the bridge management company) to continue collecting investments. It is difficult to predict whether and when the aforementioned redemption-suspended funds will be redeemed, and there is a possibility that lawsuits may be filed in the future, but the impact on the consolidated financial statements cannot be predicted at this time.
Contract related to take over PRASAC Microfinance Institution Limited
Disclosure Of Contingent Liabilities Line Items [Line Items]
Explanation Of Possibility Of Reimbursement Contingent Liabilities	On April 10, 2020, Kookmin Bank acquired 70% shares of PRASAC Microfinance Institution Plc. ("PRASAC"), a specialized credit micro finance institution in Cambodia, for US$ 603 million from its existing shareholders. Kookmin Bank has signed an agreement with the existing shareholders of PRASAC. The existing shareholders have the right of put option to sell 30% of the remaining shares to Kookmin Bank, and they are entitled to exercise their rights at the exercise price calculated on the basis of the adjusted book value of net asset as of 2021 year-end, within six months from the issue date of the audit report or the confirmation date of the adjusted value. If the put option is not exercised until its expiry, Kookmin Bank has a right to exercise a call option during the six months following the expiry of such put option. All shareholders are restricted from selling shares or additional pledge before exercising the put option and call option.
Contract related to PT Bosowa Corporindo
Disclosure Of Contingent Liabilities Line Items [Line Items]
Explanation Of Possibility Of Reimbursement Contingent Liabilities	Kookmin Bank has entered into an agreement with PT Bosowa Corporindo, a major shareholder of PT Bank Bukopin TBK. Under this agreement, Kookmin Bank and PT Bosowa Corporindo have a right of first refusal and a tag-along right. In addition, Kookmin Bank can exercise its drag-along right for two years from the time three years have elapsed since the acquisition date (July 27, 2018) in certain cases, such as violation of the agreement between shareholders.
Contract related to PT Sunindo Primasura
Disclosure Of Contingent Liabilities Line Items [Line Items]
Explanation Of Possibility Of Reimbursement Contingent Liabilities	As of December 31, 2020, KB Capital Co., Ltd. and PT Sunindo Primasura are required to hold the shares of PT Sunindo Kookmin Best Finance for five years after the completion of the share purchase. If one party is going to sell all or part of the shares, provide them as collateral, trade or dispose of them, it should give the opportunity to exercise preemption to the other party by providing written proposal including transfer price, payment method and others. Meanwhile, the shareholders of PT Sunindo Kookmin Best Finance can receive dividends for up to 20% of net profit after taxes for each fiscal year starting from the fiscal year ended December 31, 2023.
Global Spread of the Covid19
Disclosure Of Contingent Liabilities Line Items [Line Items]
Explanation Of Possibility Of Reimbursement Contingent Liabilities	The proliferation of COVID-19 has had a negative impact on the global economy, which has a greater impact than expected credit losses and potential impairment of assets in a particular portfolio, which can negatively affect the profit generation capability of the Group as follows: -There is a possibility of uncertainty about the credit risk of a borrower that could be affected by COVID-19. -Uncertainty may arise about forward-looking macroeconomic information related to expected credit losses. -Korean won may depreciate against major foreign currencies. This may result in an increase in principal and interest payments on liabilities denominated in foreign currencies, and losses on foreign exchanges transactions. -A significant decrease in the fair value of the Group's investment in an entity that could be affected by COVID-19 pandemic can occur. Meanwhile, the Group's accounting policy related to COVID-19 is described in Note 2.4 Critical accounting estimates and the impact on expected credit losses is described in Note 11.1 Changes in allowances for credit losses of loans and Note 24.2 Changes in provisions for credit losses of unused loan commitments, acceptances and guarantees.

Contingent Liabilities and Co_4

Contingent Liabilities and Commitments_Payment Guarantees That Are Exposed To Credit Risk(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
The financial instruments applying 12-month expected credit losses
Disclosure of internal credit grades [Line Items]
Credit exposure	₩ 9,038,271	₩ 8,808,274
The financial instruments applying 12-month expected credit losses | Confirmed acceptances and guarantees
Disclosure of internal credit grades [Line Items]
Credit exposure	6,689,766	6,437,530
The financial instruments applying 12-month expected credit losses | Confirmed acceptances and guarantees | Grade 1
Disclosure of internal credit grades [Line Items]
Credit exposure	4,377,798	4,220,046
The financial instruments applying 12-month expected credit losses | Confirmed acceptances and guarantees | Grade 2
Disclosure of internal credit grades [Line Items]
Credit exposure	2,269,455	2,105,637
The financial instruments applying 12-month expected credit losses | Confirmed acceptances and guarantees | Grade 3
Disclosure of internal credit grades [Line Items]
Credit exposure	27,588	93,074
The financial instruments applying 12-month expected credit losses | Confirmed acceptances and guarantees | Grade 4
Disclosure of internal credit grades [Line Items]
Credit exposure	14,925	18,773
The financial instruments applying 12-month expected credit losses | Confirmed acceptances and guarantees | Grade 5
Disclosure of internal credit grades [Line Items]
Credit exposure	0	0
The financial instruments applying 12-month expected credit losses | Unconfirmed acceptances and guarantees
Disclosure of internal credit grades [Line Items]
Credit exposure	2,348,505	2,370,744
The financial instruments applying 12-month expected credit losses | Unconfirmed acceptances and guarantees | Grade 1
Disclosure of internal credit grades [Line Items]
Credit exposure	1,422,528	1,228,258
The financial instruments applying 12-month expected credit losses | Unconfirmed acceptances and guarantees | Grade 2
Disclosure of internal credit grades [Line Items]
Credit exposure	912,209	1,121,159
The financial instruments applying 12-month expected credit losses | Unconfirmed acceptances and guarantees | Grade 3
Disclosure of internal credit grades [Line Items]
Credit exposure	11,399	17,091
The financial instruments applying 12-month expected credit losses | Unconfirmed acceptances and guarantees | Grade 4
Disclosure of internal credit grades [Line Items]
Credit exposure	2,369	4,236
The financial instruments applying 12-month expected credit losses | Unconfirmed acceptances and guarantees | Grade 5
Disclosure of internal credit grades [Line Items]
Credit exposure	0	0
The financial instruments applying lifetime expected credit losses
Disclosure of internal credit grades [Line Items]
Credit exposure	9,306,787	9,243,243
The financial instruments applying lifetime expected credit losses | Confirmed acceptances and guarantees
Disclosure of internal credit grades [Line Items]
Credit exposure	6,867,686	6,743,238
The financial instruments applying lifetime expected credit losses | Confirmed acceptances and guarantees | Grade 1
Disclosure of internal credit grades [Line Items]
Credit exposure	4,378,917	4,220,742
The financial instruments applying lifetime expected credit losses | Confirmed acceptances and guarantees | Grade 2
Disclosure of internal credit grades [Line Items]
Credit exposure	2,316,893	2,143,908
The financial instruments applying lifetime expected credit losses | Confirmed acceptances and guarantees | Grade 3
Disclosure of internal credit grades [Line Items]
Credit exposure	112,909	174,391
The financial instruments applying lifetime expected credit losses | Confirmed acceptances and guarantees | Grade 4
Disclosure of internal credit grades [Line Items]
Credit exposure	48,866	191,213
The financial instruments applying lifetime expected credit losses | Confirmed acceptances and guarantees | Grade 5
Disclosure of internal credit grades [Line Items]
Credit exposure	10,101	12,984
The financial instruments applying lifetime expected credit losses | Unconfirmed acceptances and guarantees
Disclosure of internal credit grades [Line Items]
Credit exposure	2,439,101	2,500,005
The financial instruments applying lifetime expected credit losses | Unconfirmed acceptances and guarantees | Grade 1
Disclosure of internal credit grades [Line Items]
Credit exposure	1,423,299	1,229,547
The financial instruments applying lifetime expected credit losses | Unconfirmed acceptances and guarantees | Grade 2
Disclosure of internal credit grades [Line Items]
Credit exposure	940,715	1,153,572
The financial instruments applying lifetime expected credit losses | Unconfirmed acceptances and guarantees | Grade 3
Disclosure of internal credit grades [Line Items]
Credit exposure	34,468	38,048
The financial instruments applying lifetime expected credit losses | Unconfirmed acceptances and guarantees | Grade 4
Disclosure of internal credit grades [Line Items]
Credit exposure	32,303	67,200
The financial instruments applying lifetime expected credit losses | Unconfirmed acceptances and guarantees | Grade 5
Disclosure of internal credit grades [Line Items]
Credit exposure	8,316	11,638
Non-impaired
Disclosure of internal credit grades [Line Items]
Credit exposure	250,640	413,390
Non-impaired | Confirmed acceptances and guarantees
Disclosure of internal credit grades [Line Items]
Credit exposure	167,771	295,597
Non-impaired | Confirmed acceptances and guarantees | Grade 1
Disclosure of internal credit grades [Line Items]
Credit exposure	1,119	696
Non-impaired | Confirmed acceptances and guarantees | Grade 2
Disclosure of internal credit grades [Line Items]
Credit exposure	47,438	38,271
Non-impaired | Confirmed acceptances and guarantees | Grade 3
Disclosure of internal credit grades [Line Items]
Credit exposure	85,321	81,317
Non-impaired | Confirmed acceptances and guarantees | Grade 4
Disclosure of internal credit grades [Line Items]
Credit exposure	33,440	172,440
Non-impaired | Confirmed acceptances and guarantees | Grade 5
Disclosure of internal credit grades [Line Items]
Credit exposure	453	2,873
Non-impaired | Unconfirmed acceptances and guarantees
Disclosure of internal credit grades [Line Items]
Credit exposure	82,869	117,793
Non-impaired | Unconfirmed acceptances and guarantees | Grade 1
Disclosure of internal credit grades [Line Items]
Credit exposure	771	1,289
Non-impaired | Unconfirmed acceptances and guarantees | Grade 2
Disclosure of internal credit grades [Line Items]
Credit exposure	28,506	32,413
Non-impaired | Unconfirmed acceptances and guarantees | Grade 3
Disclosure of internal credit grades [Line Items]
Credit exposure	23,069	20,957
Non-impaired | Unconfirmed acceptances and guarantees | Grade 4
Disclosure of internal credit grades [Line Items]
Credit exposure	29,934	62,964
Non-impaired | Unconfirmed acceptances and guarantees | Grade 5
Disclosure of internal credit grades [Line Items]
Credit exposure	589	170
Impaired
Disclosure of internal credit grades [Line Items]
Credit exposure	17,876	21,579
Impaired | Confirmed acceptances and guarantees
Disclosure of internal credit grades [Line Items]
Credit exposure	10,149	10,111
Impaired | Confirmed acceptances and guarantees | Grade 1
Disclosure of internal credit grades [Line Items]
Credit exposure	0	0
Impaired | Confirmed acceptances and guarantees | Grade 2
Disclosure of internal credit grades [Line Items]
Credit exposure	0	0
Impaired | Confirmed acceptances and guarantees | Grade 3
Disclosure of internal credit grades [Line Items]
Credit exposure	0	0
Impaired | Confirmed acceptances and guarantees | Grade 4
Disclosure of internal credit grades [Line Items]
Credit exposure	501	0
Impaired | Confirmed acceptances and guarantees | Grade 5
Disclosure of internal credit grades [Line Items]
Credit exposure	9,648	10,111
Impaired | Unconfirmed acceptances and guarantees
Disclosure of internal credit grades [Line Items]
Credit exposure	7,727	11,468
Impaired | Unconfirmed acceptances and guarantees | Grade 1
Disclosure of internal credit grades [Line Items]
Credit exposure	0	0
Impaired | Unconfirmed acceptances and guarantees | Grade 2
Disclosure of internal credit grades [Line Items]
Credit exposure	0	0
Impaired | Unconfirmed acceptances and guarantees | Grade 3
Disclosure of internal credit grades [Line Items]
Credit exposure	0	0
Impaired | Unconfirmed acceptances and guarantees | Grade 4
Disclosure of internal credit grades [Line Items]
Credit exposure	0	0
Impaired | Unconfirmed acceptances and guarantees | Grade 5
Disclosure of internal credit grades [Line Items]
Credit exposure	₩ 7,727	₩ 11,468

Contingent Liabilities and Co_5

Contingent Liabilities and Commitments_Acceptances And Guarantees By Counterparty(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 6,867,686	₩ 6,743,238
Unconfirmed guarantees	2,439,101	2,500,005
Total	₩ 9,306,787	₩ 9,243,243
Proportion (%)	100.00%	100.00%
Large companies
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 5,538,003	₩ 5,962,004
Unconfirmed guarantees	1,770,235	1,904,346
Total	₩ 7,308,238	₩ 7,866,350
Proportion (%)	78.53%	85.10%
Small and medium-sized companies
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 695,860	₩ 650,612
Unconfirmed guarantees	459,487	397,539
Total	₩ 1,155,347	₩ 1,048,151
Proportion (%)	12.41%	11.34%
Public sector and others
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 633,823	₩ 130,622
Unconfirmed guarantees	209,379	198,120
Total	₩ 843,202	₩ 328,742
Proportion (%)	9.06%	3.56%

Contingent Liabilities and Co_6

Contingent Liabilities and Commitments_Acceptances And Guarantees By Industry(Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 6,867,686	₩ 6,743,238
Unconfirmed guarantees	2,439,101	2,500,005
Total	₩ 9,306,787	₩ 9,243,243
Proportion (%)	100.00%	100.00%
Financial institutions
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 632,947	₩ 260,974
Unconfirmed guarantees	5,871	23,999
Total	₩ 638,818	₩ 284,973
Proportion (%)	6.86%	3.08%
Manufacturing
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 2,992,319	₩ 3,373,220
Unconfirmed guarantees	1,285,530	1,627,840
Total	₩ 4,277,849	₩ 5,001,060
Proportion (%)	45.96%	54.11%
Service
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 920,352	₩ 1,187,516
Unconfirmed guarantees	89,457	88,158
Total	₩ 1,009,809	₩ 1,275,674
Proportion (%)	10.85%	13.80%
Wholesale & Retail
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 1,086,772	₩ 1,126,976
Unconfirmed guarantees	891,619	597,998
Total	₩ 1,978,391	₩ 1,724,974
Proportion (%)	21.26%	18.66%
Construction
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 411,601	₩ 467,114
Unconfirmed guarantees	14,488	20,590
Total	₩ 426,089	₩ 487,704
Proportion (%)	4.58%	5.28%
Public sector
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 104,925	₩ 107,481
Unconfirmed guarantees	103,285	81,895
Total	₩ 208,210	₩ 189,376
Proportion (%)	2.24%	2.05%
Others
Acceptances And Guarantees By Counterparty Line Items [Line Items]
Confirmed guarantees	₩ 718,770	₩ 219,957
Unconfirmed guarantees	48,851	59,525
Total	₩ 767,621	₩ 279,482
Proportion (%)	8.25%	3.02%

Contingent Liabilities and Co_7

Contingent Liabilities and Commitments_Major Pending Lawsuits in which the Group is a Defendant(Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)₩ / shares
Kookmin Bank | Request for a return of redemption amount
Disclosure Of Contingent Liabilities
Loss Contingency Pending Claims Number | ₩ / shares	1
Loss Contingency Damages Sought Value | ₩	₩ 48,068
Description of the lawsuits	Kookmin Bank invested the assets entrusted by OO Asset Management and OO Investment Trust Management in the Fairfield Sentry Limited, and Fairfield Sentry Limited reinvested the assets in Bernard L. Madoff Investment Securities LLC managed by Bernard Madoff (Bernard L. Madoff Investment Securities LLC is in the liquidation process due to Ponzi scheme fraud-related losses). Bankruptcy trustee of Bernard L. Madoff Investment Securities LLC filed a lawsuit against Kookmin Bank seeking to return the amount of redemptions received by Kookmin Bank through Fairfield Sentry Limited.
Status of the lawsuits	Application for incineration by the defendant has been denied, and further proceedings are scheduled. [Related litigation is in progress at the New York Southern District Bankruptcy Court (10-03777) at the written complaint review stage]
Kookmin Bank | Request for compensation for damages
Disclosure Of Contingent Liabilities
Loss Contingency Pending Claims Number | ₩ / shares	1
Loss Contingency Damages Sought Value | ₩	₩ 1,629,557
Description of the lawsuits	The plaintiff filed a lawsuit for compensation for damages against Indonesian Financial Supervisory Authority (OJK) and Kookmin Bank as joint defendants, claiming that the capital increase and Kookmin Bank's acquisition of PT Bank Bukopin TBK was illegal in violation of local laws and regulations in Indonesia.
Status of the lawsuits	It is difficult to accurately predict the result of the lawsuit as of now because the complaint has not been received, but it is judged that the possibility that the result of this lawsuit will have a significant impact on the financial position of Kookmin Bank is low.
KB Securities Co., Ltd. | Request for a return of transaction amount (Australian fund)
Disclosure Of Contingent Liabilities
Loss Contingency Pending Claims Number | ₩ / shares	1
Loss Contingency Damages Sought Value | ₩	₩ 100,000
Description of the lawsuits	The plaintiffs OOOO Securities and OOOO Life Insurance filed lawsuits, claiming that the KB Securities Co., Ltd. provided false information on major matters in the product description while selling JB Australia NDIS Private Fund No.1 (on April 25, 2019, plaintiffs invested KRW 50 billion each) (a) (Primary claim) requesting KB Securities Co., Ltd. to return unjust enrichment of KRW 100 billion for cancellation of sales contracts of beneficiary certificates due to an error or termination of the contract due to default, (b) (Secondary claim) requesting for compensation for damages in investments amounting to KRW 100 billion due to violation of the investor protection obligation and fraudulent transactions of KB Securities Co., Ltd. and OOO Asset Management.
Status of the lawsuits	First trial is in progress (second hearing for the first trial is scheduled on April 2, 2021).

Subsidiaries_Details Of Subsidi

Subsidiaries_Details Of Subsidiaries(Details)	12 Months Ended
	Dec. 31, 2020
Kookmin Bank
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	Kookmin Bank
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Banking and foreign exchange transaction
KB Securities Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	KB Securities Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Financial investment
KB Insurance Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	KB Insurance Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Non-life insurance
KB Kookmin Card Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	KB Kookmin Card Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Credit card and installment financing
Prudential Life Insurance Company of Korea Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	Prudential Life Insurance Company of Korea Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Life insurance
KB Asset Management Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	KB Asset Management Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Collective investment and advisory
KB Capital Co.,Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	KB Capital Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Financial Leasing
KB Life Insurance Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	KB Life Insurance Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Life insurance
KB Real Estate Trust Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	KB Real Estate Trust Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Real estate trust management
KB Savings Bank Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	KB Savings Bank Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Savings banking
KB Investment Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	KB Investment Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Capital investment
KB Data System Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	KB Data System Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Software advisory, development, and supply
KB Credit Information Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Financial Group Inc.
Investee	KB Credit Information Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Collection of receivables or credit investigation
Kookmin Bank Cambodia PLC.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	Kookmin Bank
Investee	Kookmin Bank Cambodia PLC.
Ownership interests(%)	100.00%
Location	Cambodia
Date of financial statements	Dec. 31, 2020
Industry	Banking and foreign exchange transaction
Kookmin Bank China Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	Kookmin Bank
Investee	Kookmin Bank (China) Ltd.
Ownership interests(%)	100.00%
Location	China
Date of financial statements	Dec. 31, 2020
Industry	Banking and foreign exchange transaction
KB Microfinance Myanmar Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	Kookmin Bank
Investee	KB Microfinance Myanmar Co., Ltd.
Ownership interests(%)	100.00%
Location	Myanmar
Date of financial statements	Dec. 31, 2020
Industry	Microfinance services
PRASAC Microfinance Institution Plc.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	Kookmin Bank
Investee	PRASAC Microfinance Institution Plc.
Ownership interests(%)	70.00%
Location	Cambodia
Date of financial statements	Dec. 31, 2020
Industry	Microfinance services
PT Bank Bukopin TBK
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	Kookmin Bank
Investee	PT Bank Bukopin TBK
Ownership interests(%)	67.00%
Location	Indonesia
Date of financial statements	Dec. 31, 2020
Industry	Banking and foreign exchange transaction
PT Bank Syariah Bukopin
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	Kookmin Bank
Investee	PT Bank Syariah Bukopin
Ownership interests(%)	92.78%
Location	Indonesia
Date of financial statements	Dec. 31, 2020
Industry	Banking
PT Bukopin Finance
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	Kookmin Bank
Investee	PT Bukopin Finance
Ownership interests(%)	97.03%
Location	Indonesia
Date of financial statements	Dec. 31, 2020
Industry	Installment financing
KB Bank Myanmar Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	Kookmin Bank
Investee	KB Bank Myanmar Co., Ltd.
Ownership interests(%)	100.00%
Location	Myanmar
Date of financial statements	Dec. 31, 2020
Industry	Banking and foreign exchange transaction
KBFG Securities America Inc.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Securities Co., Ltd.
Investee	KBFG Securities America Inc.
Ownership interests(%)	100.00%
Location	United States of America
Date of financial statements	Dec. 31, 2020
Industry	Investment advisory and securities dealing activities
KB Securities Hong Kong Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Securities Co., Ltd.
Investee	KB Securities Hong Kong Ltd.
Ownership interests(%)	100.00%
Location	China
Date of financial statements	Dec. 31, 2020
Industry	Investment advisory and securities dealing activities
KB Securities Vietnam Joint Stock Company
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Securities Co., Ltd.
Investee	KB Securities Vietnam Joint Stock Company
Ownership interests(%)	99.70%
Location	Vietnam
Date of financial statements	Dec. 31, 2020
Industry	Investment advisory and securities dealing activities
KB FINA Joint Stock Company
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Securities Co., Ltd.
Investee	KB FINA Joint Stock Company
Ownership interests(%)	100.00%
Location	Vietnam
Date of financial statements	Dec. 31, 2020
Industry	Investment advisory and securities dealing activities
Leading Insurance Services, Inc.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Insurance Co., Ltd.
Investee	Leading Insurance Services, Inc.
Ownership interests(%)	100.00%
Location	United States of America
Date of financial statements	Dec. 31, 2020
Industry	Management service
LIG Insurance (China) Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Insurance Co., Ltd.
Investee	LIG Insurance (China) Co., Ltd.
Ownership interests(%)	100.00%
Location	China
Date of financial statements	Dec. 31, 2020
Industry	Non-life insurance
PT. KB Insurance Indonesia
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Insurance Co., Ltd.
Investee	PT. KB Insurance Indonesia
Ownership interests(%)	70.00%
Location	Indonesia
Date of financial statements	Dec. 31, 2020
Industry	Non-life insurance
KB Claims Survey & Adjusting
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Insurance Co., Ltd.
Investee	KB Claims Survey & Adjusting
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Claim service
KB Sonbo CNS
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Insurance Co., Ltd.
Investee	KB Sonbo CNS
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Management service
KB Golden Life Care Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Insurance Co., Ltd.
Investee	KB Golden Life Care Co., Ltd.
Ownership interests(%)	100.00%
Location	Korea
Date of financial statements	Dec. 31, 2020
Industry	Service
KB DAEHAN SPECIALIZED BANK PLC.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Kookmin Card Co., Ltd.
Investee	KB DAEHAN SPECIALIZED BANK PLC.
Ownership interests(%)	95.71%
Location	Cambodia
Date of financial statements	Dec. 31, 2020
Industry	Auto Installment finance
PT. KB Finansia Multi Finance
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Kookmin Card Co., Ltd.
Investee	PT. KB Finansia Multi Finance
Ownership interests(%)	80.00%
Location	Indonesia
Date of financial statements	Dec. 31, 2020
Industry	Auto Installment finance
PT Sunindo Kookmin Best Finance
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Capital Co., Ltd.
Investee	PT Sunindo Kookmin Best Finance
Ownership interests(%)	85.00%
Location	Indonesia
Date of financial statements	Dec. 31, 2020
Industry	Auto Installment finance
KB KOLAO LEASING Co., Ltd.
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Kookmin Card Co., Ltd., KB Capital Co., Ltd.
Investee	KB KOLAO LEASING CO., LTD.
Ownership interests(%)	80.00%
Location	Laos
Date of financial statements	Dec. 31, 2020
Industry	Auto Installment finance
KBAM Shanghai Advisory Services Co.,Ltd
Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items]
Investor	KB Asset Management Co., Ltd.
Investee	KBAM Shanghai Advisory Services Co.,Ltd
Ownership interests(%)	100.00%
Location	China
Date of financial statements	Dec. 31, 2020
Industry	General advisory

Subsidiaries_The Condensed Fina

Subsidiaries_The Condensed Financial Information Of Major Subsidiaries(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Kookmin Bank
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets	[1]	₩ 438,444,114		₩ 387,425,038
Liabilities	[1]	408,036,040		358,420,805
Equity	[1]	30,408,074		29,004,233
Operating income	[1]	24,519,818		20,817,431
Profit (loss) for the year	[1]	2,298,195		2,439,079
Total comprehensive income (loss) for the year	[1]	₩ 2,905,953		₩ 2,428,154
Description Of Basis Of Preparation Of Condensed Financial Information Of Subsidiary		Financial information is based on its consolidated financial statements.		Financial information is based on its consolidated financial statements.
KB Securities Co., Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets	[1],[2]	₩ 57,570,654		₩ 47,816,512
Liabilities	[1],[2]	52,516,488		43,131,858
Equity	[1],[2]	5,054,166		4,684,654
Operating income	[1],[2]	10,040,497		8,053,363
Profit (loss) for the year	[1],[2]	425,622		257,893
Total comprehensive income (loss) for the year	[1],[2]	₩ 449,507		₩ 261,639
Description Of Basis Of Preparation Of Condensed Financial Information Of Subsidiary		Financial information is based on its consolidated financial statements. Includes fair value adjustments arising from the acquisition.		Financial information is based on its consolidated financial statements. Includes fair value adjustments arising from the acquisition.
KB Insurance Co., Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets	[1],[2]	₩ 39,078,117		₩ 36,552,368
Liabilities	[1],[2]	35,086,458		32,689,460
Equity	[1],[2]	3,991,659		3,862,908
Operating income	[1],[2]	13,735,778		12,661,927
Profit (loss) for the year	[1],[2]	163,884		234,327
Total comprehensive income (loss) for the year	[1],[2]	₩ 129,042		₩ 366,362
Description Of Basis Of Preparation Of Condensed Financial Information Of Subsidiary		Financial information is based on its consolidated financial statements. Includes fair value adjustments arising from the acquisition.		Financial information is based on its consolidated financial statements. Includes fair value adjustments arising from the acquisition.
KB Kookmin Card Co., Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets	[1]	₩ 24,071,644		₩ 22,990,114
Liabilities	[1]	19,789,958		18,925,195
Equity	[1]	4,281,686		4,064,919
Operating income	[1]	3,210,581		3,102,186
Profit (loss) for the year	[1]	324,662		316,546
Total comprehensive income (loss) for the year	[1]	₩ 308,148		₩ 306,251
Description Of Basis Of Preparation Of Condensed Financial Information Of Subsidiary		Financial information is based on its consolidated financial statements.		Financial information is based on its consolidated financial statements.
Prudential Life Insurance Company of Korea Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets	[2]	₩ 25,121,656
Liabilities	[2]	22,681,729
Equity	[2]	2,439,927
Operating income	[2]	656,062
Profit (loss) for the year	[2]	55,711
Total comprehensive income (loss) for the year	[2]	₩ (31,718)
Description Of Basis Of Preparation Of Condensed Financial Information Of Subsidiary		Includes fair value adjustments arising from the acquisition.
KB Life Insurance Co., Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets		₩ 10,424,916		₩ 9,801,905	[1]
Liabilities		9,842,789		9,186,567	[1]
Equity		582,127		615,338	[1]
Operating income		1,897,859		1,506,417	[1]
Profit (loss) for the year		(23,185)		15,963	[1]
Total comprehensive income (loss) for the year		(33,210)		₩ 63,107	[1]
Description Of Basis Of Preparation Of Condensed Financial Information Of Subsidiary				Financial information is based on its consolidated financial statements.
KB Asset Management Co., Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets	[1]	335,601		₩ 310,018
Liabilities	[1]	112,522		114,776
Equity	[1]	223,079		195,242
Operating income	[1]	191,427		148,780
Profit (loss) for the year	[1]	57,317		48,899
Total comprehensive income (loss) for the year	[1]	₩ 57,802		₩ 48,490
Description Of Basis Of Preparation Of Condensed Financial Information Of Subsidiary		Financial information is based on its consolidated financial statements.		Financial information is based on its consolidated financial statements.
KB Capital Co.,Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets	[1],[2]	₩ 12,823,748		₩ 11,190,568
Liabilities	[1],[2]	11,392,177		10,036,077
Equity	[1],[2]	1,431,571		1,154,491
Operating income	[1],[2]	1,300,378		931,694
Profit (loss) for the year	[1],[2]	141,646		117,028
Total comprehensive income (loss) for the year	[1],[2]	₩ 139,949		₩ 115,524
Description Of Basis Of Preparation Of Condensed Financial Information Of Subsidiary		Financial information is based on its consolidated financial statements. Includes fair value adjustments arising from the acquisition.		Financial information is based on its consolidated financial statements. Includes fair value adjustments arising from the acquisition.
KB Savings Bank Co., Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets		₩ 1,883,720		₩ 1,361,032
Liabilities		1,658,116		1,148,625
Equity		225,604		212,407
Operating income		104,397		92,435
Profit (loss) for the year		17,305		16,301
Total comprehensive income (loss) for the year		16,197		15,433
KB Real Estate Trust Co., Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets		437,619	[1]	377,938
Liabilities		108,096	[1]	85,132
Equity		329,523	[1]	292,806
Operating income		139,070	[1]	119,899
Profit (loss) for the year		66,874	[1]	61,713
Total comprehensive income (loss) for the year		₩ 66,718	[1]	61,672
Description Of Basis Of Preparation Of Condensed Financial Information Of Subsidiary		Financial information is based on its consolidated financial statements.
KB Investment Co., Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets	[1]	₩ 848,693		756,972
Liabilities	[1]	618,552		542,221
Equity	[1]	230,141		214,751
Operating income	[1]	128,014		99,822
Profit (loss) for the year	[1]	15,387		11,311
Total comprehensive income (loss) for the year	[1]	₩ 15,390		₩ 11,310
Description Of Basis Of Preparation Of Condensed Financial Information Of Subsidiary		Financial information is based on its consolidated financial statements.		Financial information is based on its consolidated financial statements.
KB Credit Information Co., Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets		₩ 27,711		₩ 27,834
Liabilities		11,773		12,936
Equity		15,938		14,898
Operating income		39,767		38,278
Profit (loss) for the year		1,132		(256)
Total comprehensive income (loss) for the year		1,040		(337)
KB Data System Co., Ltd.
Subsidiaries Condensed Financial Information Abstract [Abstract]
Assets		40,347		41,690
Liabilities		23,024		20,999
Equity		17,323		20,691
Operating income		149,966		158,067
Profit (loss) for the year		(1,729)		4,664
Total comprehensive income (loss) for the year		₩ (3,367)		₩ 4,282
[1]	Financial information is based on its consolidated financial statements.
[2]	Includes fair value adjustments arising from the acquisition.

Subsidiaries_Nature Of The Risk

Subsidiaries_Nature Of The Risks Associated With Interests In Consolidated Structured Entities(Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)
K plus 1st L.L.C And Other Subsidiaries
Disclosure Of Information About Consolidated Structured Entities Line Items [Line Items]
Exposure Of The Risks Associated With Interests In Consolidated Structured Entities	₩ 4,082,878
Description Of Terms Of Contractual Arrangements That Could Require Parent Or Subsidiaries To Provide Financial Support To Structured Entity	The Group has provided payment guarantees of KRW 4,082,878 million to K plus 1st L.L.C and other subsidiaries.
KB Sinansan Line Private Special Asset Fund And Other Subsidiaries
Disclosure Of Information About Consolidated Structured Entities Line Items [Line Items]
Exposure Of The Risks Associated With Interests In Consolidated Structured Entities	₩ 1,046,516
Description Of Terms Of Contractual Arrangements That Could Require Parent Or Subsidiaries To Provide Financial Support To Structured Entity	The Group provides capital commitment to 23 subsidiaries including KB Sinansan Line Private Special Asset Fund (SOC). The unexecuted amount of the capital commitment is KRW 1,046,516 million. Based on the capital commitment, the Group is subject to increase its investment upon the request of the asset management company or the additional agreement among investors.
Trusts
Disclosure Of Information About Consolidated Structured Entities Line Items [Line Items]
Description Of Terms Of Contractual Arrangements That Could Require Parent Or Subsidiaries To Provide Financial Support To Structured Entity	The Group provides the guarantees of payment of principal, or principal and fixed rate of return in case the operating results of the trusts are less than the guaranteed principal, or principal and fixed rate of return.

Subsidiaries_Changes In Subsidi

Subsidiaries_Changes In Subsidiaries(Details)	12 Months Ended
	Dec. 31, 2020
Prudential Life Insurance Company of Korea Ltd.
Disclosure Of Changes In Parents Ownership Interest In Subsidiary Line Items [Line Items]
Description	Holds more than a majority of the ownership interests
KB Hwaseong 1st L.L.C. and 82 others
Disclosure Of Changes In Parents Ownership Interest In Subsidiary Line Items [Line Items]
Description	Holds the power in the event of default and is exposed to significant variable returns by providing lines of credit, ABCP purchase commitments or acquisition of subordinated debt
KB Global Infrastructure Synergy Private Special Asset Fund and 21 others
Disclosure Of Changes In Parents Ownership Interest In Subsidiary Line Items [Line Items]
Description	Holds the power to determine the operation of the funds and is exposed to variable returns by holding significant amount of ownership interests
KB Smart Scale Up Fund and 2 others
Disclosure Of Changes In Parents Ownership Interest In Subsidiary Line Items [Line Items]
Description	Holds the power as a general partner and is exposed to variable returns by holding significant amount of ownership interests
KBH the 3rd L.L.C and 60 others
Disclosure Of Changes In Parents Ownership Interest In Subsidiary Line Items [Line Items]
Description	Termination of the commitments
Sechste Casalog KG
Disclosure Of Changes In Parents Ownership Interest In Subsidiary Line Items [Line Items]
Description	Liquidation
KB Contents Panda iMBC Contents Venture Fund
Disclosure Of Changes In Parents Ownership Interest In Subsidiary Line Items [Line Items]
Description	Disposal
Hyundai Smart Index Alpha Securities Feeder Investment Trust No.1
Disclosure Of Changes In Parents Ownership Interest In Subsidiary Line Items [Line Items]
Description	Decrease in ownership interests to less than majority

Unconsolidated Structured Ent_3

Unconsolidated Structured Entity_The Nature Purpose and Activities of the Unconsolidated Structured Entities and How the Structured Entities are Financed(Details)	12 Months Ended
	Dec. 31, 2020
Structured financing
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Purpose	Granting PF loans to SOC and real estate Granting loans to ships/aircrafts SPC
Activity	Construction of SOC and real estate Building ships, construction and purchase of aircrafts
Method of Financing	Loan commitments through credit line, providing credit line and investment agreements
Investment funds
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Purpose	Investment in beneficiary certificates Investment in PEF and partnerships
Activity	Management of fund assets Payment of fund fees and allocation of fund profits
Method of Financing	Sales of beneficiary certificate instruments Investment from general partners and limited partners
Trusts
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Purpose	Management of financial trusts; -Development trust -General unspecified money trust - Trust whose principal is not guaranteed -Other trusts
Activity	Management of trusted financial assets Payment of trust fees and allocation of trust profits.
Method of Financing	Sales of trusted financial assets
Asset-backed securitization
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Purpose	Early cash generation through transfer of securitized assets Fees earned through services to SPC, such as providing lines of credit and ABCP purchase commitments
Activity	Fulfillment of asset-backed securitization plan Purchase and collection of securitized assets Issuance and repayment of ABS and ABCP
Method of Financing	Issuance of ABS and ABCP based on securitized assets

Unconsolidated Structured Ent_4

Unconsolidated Structured Entity_The Size of the Unconsolidated Structured Entities and the Risks Associated With Its Interests in Unconsolidated Structured Entities(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Nature
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Total assets of unconsolidated Structured Entity		₩ 459,827,800	₩ 335,743,075
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		28,366,642	24,337,020
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		1,006,646	1,040,300
Maximum exposure	[1]	40,723,723	34,339,319
Assets held	[1]	28,366,642	24,337,020
Purchase and investment commitments	[1]	6,412,047	4,964,604
Unused credit	[1]	4,360,785	2,613,432
Acceptances and guarantees and loan commitments	[1]	₩ 1,584,249	₩ 2,424,263
Description Of Comparison Between Assets And Liabilities Recognised In Relation To Structured Entities And Maximum Exposure To Loss From Interests In Structured Entities		Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.	Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.
Nature | Financial assets at fair value through profit or loss
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		₩ 13,625,871	₩ 12,384,191
Nature | Derivative financial assets
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		3,005	2,959
Nature | Loans measured at amortized cost
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		6,378,270	6,256,781
Nature | Financial investments
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		7,849,054	5,166,578
Nature | Investment In Aassociates
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		396,953	352,488
Nature | Other assets
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		113,489	174,023
Nature | Deposits
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		983,083	1,022,463
Nature | Derivative financial liabilities
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		1,307	228
Nature | Other liabilities
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		22,256	17,609
Structured financing
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Total assets of unconsolidated Structured Entity		56,200,300	54,206,404
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		4,822,905	4,910,284
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		620,445	524,448
Maximum exposure	[1]	7,028,661	7,419,548
Assets held	[1]	4,822,905	4,910,284
Purchase and investment commitments	[1]	0	38,650
Unused credit	[1]	1,322,414	654,203
Acceptances and guarantees and loan commitments	[1]	₩ 883,342	₩ 1,816,411
Methods of determining the maximum exposure		Loan commitments /investment agreements / purchase commitments and acceptances and guarantees	Loan commitments /investment agreements / purchase commitments and acceptances and guarantees
Description Of Comparison Between Assets And Liabilities Recognised In Relation To Structured Entities And Maximum Exposure To Loss From Interests In Structured Entities		Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.	Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.
Structured financing | Financial assets at fair value through profit or loss
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		₩ 164,996	₩ 132,685
Structured financing | Derivative financial assets
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Structured financing | Loans measured at amortized cost
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		4,655,337	4,775,723
Structured financing | Financial investments
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Structured financing | Investment In Aassociates
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Structured financing | Other assets
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		2,572	1,876
Structured financing | Deposits
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		612,023	523,086
Structured financing | Derivative financial liabilities
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Structured financing | Other liabilities
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		8,422	1,362
Investment funds
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Total assets of unconsolidated Structured Entity		285,528,467	180,236,568
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		11,931,895	10,561,340
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		26,936	90,209
Maximum exposure	[1]	17,599,392	14,551,784
Assets held	[1]	11,931,895	10,561,340
Purchase and investment commitments	[1]	5,650,847	3,980,356
Unused credit	[1]	0	2,900
Acceptances and guarantees and loan commitments	[1]	₩ 16,650	₩ 7,188
Methods of determining the maximum exposure		Investments /loans and Investment agreements	Investments /loans and Investment agreements
Description Of Comparison Between Assets And Liabilities Recognised In Relation To Structured Entities And Maximum Exposure To Loss From Interests In Structured Entities		Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.	Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.
Investment funds | Financial assets at fair value through profit or loss
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		₩ 11,151,958	₩ 9,846,278
Investment funds | Derivative financial assets
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Investment funds | Loans measured at amortized cost
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		379,727	293,221
Investment funds | Financial investments
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Investment funds | Investment In Aassociates
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		396,953	352,488
Investment funds | Other assets
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		3,257	69,353
Investment funds | Deposits
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		26,839	90,131
Investment funds | Derivative financial liabilities
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Investment funds | Other liabilities
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		97	78
Trusts
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Total assets of unconsolidated Structured Entity		1,984,006	2,287,172
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		353,679	360,587
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		1	0
Maximum exposure	[1]	371,966	389,014
Assets held	[1]	353,679	360,587
Purchase and investment commitments	[1]	0	0
Unused credit	[1]	18,287	28,427
Acceptances and guarantees and loan commitments	[1]	₩ 0	₩ 0
Methods of determining the maximum exposure		Trust paying dividends by results: Total amount of trust exposure	Trust paying dividends by results: Total amount of trust exposure
Description Of Comparison Between Assets And Liabilities Recognised In Relation To Structured Entities And Maximum Exposure To Loss From Interests In Structured Entities		Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.	Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.
Trusts | Financial assets at fair value through profit or loss
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		₩ 0	₩ 0
Trusts | Derivative financial assets
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Trusts | Loans measured at amortized cost
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		262,382	266,974
Trusts | Financial investments
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Trusts | Investment In Aassociates
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Trusts | Other assets
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		91,297	93,613
Trusts | Deposits
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Trusts | Derivative financial liabilities
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Trusts | Other liabilities
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		1	0
Asset-backed securitization and others
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Total assets of unconsolidated Structured Entity		116,115,027	99,012,931
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		11,258,163	8,504,809
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		359,264	425,643
Maximum exposure	[1]	15,723,704	11,978,973
Assets held	[1]	11,258,163	8,504,809
Purchase and investment commitments	[1]	761,200	945,598
Unused credit	[1]	3,020,084	1,927,902
Acceptances and guarantees and loan commitments	[1]	₩ 684,257	₩ 600,664
Methods of determining the maximum exposure		Providing credit lines/ purchase commitments/ loan commitments and acceptances and guarantees	Providing credit lines/ purchase commitments/ loan commitments and acceptances and guarantees
Description Of Comparison Between Assets And Liabilities Recognised In Relation To Structured Entities And Maximum Exposure To Loss From Interests In Structured Entities		Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.	Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.
Asset-backed securitization and others | Financial assets at fair value through profit or loss
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		₩ 2,308,917	₩ 2,405,228
Asset-backed securitization and others | Derivative financial assets
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		3,005	2,959
Asset-backed securitization and others | Loans measured at amortized cost
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		1,080,824	920,863
Asset-backed securitization and others | Financial investments
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		7,849,054	5,166,578
Asset-backed securitization and others | Investment In Aassociates
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		0	0
Asset-backed securitization and others | Other assets
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Assets Recognised In Entitys Financial Statements In Relation To Structured Entities		16,363	9,181
Asset-backed securitization and others | Deposits
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		344,221	409,246
Asset-backed securitization and others | Derivative financial liabilities
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		1,307	228
Asset-backed securitization and others | Other liabilities
Disclosure Of Unconsolidated Structured Entities Line Items [Line Items]
Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities		₩ 13,736	₩ 16,169
[1]	Maximum exposure includes the asset amounts, after deducting loss (provision for credit losses, impairment losses and others), recognized in the consolidated financial statements of the Group.

Related Party Transactions_Prof

Related Party Transactions_Profit And Loss Arising From Transactions With Related Parties(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Balhae Infrastructure Company
Related Party Transactions [Abstract]
Fee and commission income		₩ 6,817	₩ 6,743		₩ 6,691
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Other assets		1,733	1,718
Korea Credit Bureau Co., Ltd.
Related Party Transactions [Abstract]
Interest expense		7	21		127
Fee and commission income		957	1,056		1,194
Fee and commission expense		3,280	2,541		1,909
Insurance income		5	3		0
Other operating expense		1	0		4
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Loans measured at amortized cost (gross amount)		36	43
Deposits		19,982	17,966
Provisions		0	1
Insurance liabilities		1	2
Other liabilities		623	0
KoFC KBIC Frontier Champ 2010-5(PEF)
Related Party Transactions [Abstract]
Fee and commission income	[1]	₩ 0	0		197
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
KB GwS Private Securities Investment Trust
Related Party Transactions [Abstract]
Fee and commission income		₩ 853	851		851
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Other assets		641	641
Incheon Bridge Co., Ltd.
Related Party Transactions [Abstract]
Interest income		4,345	8,612		9,426
Interest expense		334	483		296
Fee and commission income		23	0		9
Fee and commission expense		6	7		2
Insurance income		279	284		365
Gains on financial instruments at fair value through profit or loss		899	4,975		2,655
Reversal of credit losses		0	5		6
Provision for credit losses		472	1		1
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		38,756	37,857
Loans measured at amortized cost (gross amount)		133,002	147,707
Allowances for credit losses		202	12
Other assets		545	520
Deposits		39,520	45,447
Provisions		292	10
Insurance liabilities		109	108
Other liabilities		205	346
KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No. 2
Related Party Transactions [Abstract]
Fee and commission income		12	178		210
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Other assets		0	89
Aju Good Technology Venture Fund
Related Party Transactions [Abstract]
Interest expense		18	22		30
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		3,093	5,456
Other liabilities		1	2
KB Star Office Private Real Estate Investment Trust No.1
Related Party Transactions [Abstract]
Interest income		371	370		370
Interest expense		61	208		93
Fee and commission income		436	435		435
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Loans measured at amortized cost (gross amount)		10,000	10,000
Allowances for credit losses		5	4
Other assets		137	136
Deposits		4,255	8,293
Other liabilities		24	66
RAND Bio Science Co., Ltd.
Related Party Transactions [Abstract]
Interest expense		11	5		3
Other non-operating expense		0	843		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Loans measured at amortized cost (gross amount)		1	1
Deposits		693	4,452
Inno Lending Co., Ltd.
Related Party Transactions [Abstract]
Fee and commission income	[1]	₩ 0	0		1
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
SY Auto Capital Co., Ltd.
Related Party Transactions [Abstract]
Interest income		₩ 1,097	1,016		1,279
Interest expense		2	1		0
Fee and commission income		39	34		73
Fee and commission expense		132	389		840
Insurance income		40	32		33
Other operating income		1,709	689		621
Other operating expense		121	288		415
Reversal of credit losses		17	13		0
Provision for credit losses		0	0		14
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Loans measured at amortized cost (gross amount)		40,060	41,990
Allowances for credit losses		57	4
Other assets		65	63
Deposits		6	8
Provisions		0	13
Insurance liabilities		13	13
Other liabilities		₩ 76	₩ 70
Description Of Transactions With Related Party		the Group purchased installment financial assets, etc. from SY Auto Capital Co., Ltd. amounting to KRW 1,393,346 million and KRW 1,504,217 million for the years ended December 31, 2019 and 2020, respectively.	the Group purchased installment financial assets, etc. from SY Auto Capital Co., Ltd. amounting to KRW 1,393,346 million and KRW 1,504,217 million for the years ended December 31, 2019 and 2020, respectively.
Food Factory Co., Ltd.
Related Party Transactions [Abstract]
Interest income		₩ 52	₩ 41		9
Interest expense		12	0		0
Fee and commission expense		4	12		1
Insurance income		5	4		5
Gains on financial instruments at fair value through profit or loss		72	60		30
Reversal of credit losses		0	0		1
Provision for credit losses		8	1		1
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		662	590
Loans measured at amortized cost (gross amount)		3,210	1,992
Allowances for credit losses		8	2
Other assets		3	1
Deposits		1,555	1,073
Provisions		2	0
Insurance liabilities		5	4
Other liabilities		9	1
KB Pre IPO Secondary Venture Fund No.1
Related Party Transactions [Abstract]
Interest expense		3	7		27
Fee and commission income		110	110		110
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		629	2,955
Other liabilities		0	1
Built On Co., Ltd.
Related Party Transactions [Abstract]
Interest income	[1]	0	1		4
Insurance income	[1]	0	1		2
Losses on financial instruments at fair value through profit or loss	[1]	₩ 0	0		1
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
KB Private Equity Fund No.3
Related Party Transactions [Abstract]
Fee and commission income		₩ 463	480		521
Wise Asset Management Co., Ltd.
Related Party Transactions [Abstract]
Interest expense		0	2		9
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		0	21
Acts Co., Ltd.
Related Party Transactions [Abstract]
Interest income		1	1		0
Insurance income		0	1		2
Gains on financial instruments at fair value through profit or loss		0	30		0
Losses on financial instruments at fair value through profit or loss		0	0		1,851
Other non-operating expense		0	0		1,246
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		18	1
Insurance liabilities		1	0
Other liabilities		100	100
Dongjo Co., Ltd.
Related Party Transactions [Abstract]
Insurance income		1	2		2
Reversal of credit losses		0	0		31
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Insurance liabilities		1	1
APRO Co., Ltd.
Related Party Transactions [Abstract]
Interest income	[1]	7	19		0
Interest expense	[1]	1	4		1
Fee and commission expense	[1]	0	17		0
Insurance income	[1]	1	4		5
Provision for credit losses	[1]	1	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Loans measured at amortized cost (gross amount)	[2]	0	2,019
Deposits	[2]	0	3,201
Insurance liabilities	[2]	0	2
Other liabilities		₩ 0	1	[2]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020, therefore, the remaining outstanding balances with those entities are not disclosed.
POSCO-KB Shipbuilding Fund
Related Party Transactions [Abstract]
Interest expense		₩ 0	0		81
Fee and commission income		387	490		490
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Other assets		264	0
Dae-A Leisure Co., Ltd.
Related Party Transactions [Abstract]
Interest expense		7	8		9
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		636	753
Other liabilities		21	14
Paycoms Co., Ltd.
Related Party Transactions [Abstract]
Interest income		10	10		10
Insurance income		0	1		1
Gains on financial instruments at fair value through profit or loss		69	125		125
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		1,226	1,157
Other assets		1	1
Deposits		1	1
Big Dipper Co., Ltd.
Related Party Transactions [Abstract]
Fee and commission expense		768	0		0
Reversal of credit losses		0	0		2
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Loans measured at amortized cost (gross amount)		4	11
Deposits		1	6
KB-TS Technology Venture Private Equity Fund
Related Party Transactions [Abstract]
Fee and commission income		126	730		305
KB-SJ Tourism Venture Fund
Related Party Transactions [Abstract]
Fee and commission income		338	422		314
JLK Inspection Co., Ltd.
Related Party Transactions [Abstract]
Interest income	[1]	0	0		6
Interest expense	[1]	₩ 0	1		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
TESTIAN Inc.
Related Party Transactions [Abstract]
Interest income	[1]	₩ 0	3		4
Gains on financial instruments at fair value through profit or loss	[1]	₩ 0	0		83
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
Rainist Co., Ltd.
Related Party Transactions [Abstract]
Interest expense		₩ 0	0		2
Fee and commission income		36	39		0
Fee and commission expense		5	0		0
Gains on financial instruments at fair value through profit or loss		1,636	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		9,141	7,504
Iwon Alloy Co., Ltd.
Related Party Transactions [Abstract]
Insurance income		1	2		1
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Insurance liabilities		0	1
RMGP Bio-Pharma Investment Fund, L.P.
Related Party Transactions [Abstract]
Fee and commission income		27	0		0
Gains on financial instruments at fair value through profit or loss		0	947		0
Losses on financial instruments at fair value through profit or loss		489	2,120		0
Other non-operating income			33		10
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		4,250	3,419
Other liabilities		71	2
Hasys.
Related Party Transactions [Abstract]
Insurance income		63	50		4
Gains on financial instruments at fair value through profit or loss		0	136		0
Losses on financial instruments at fair value through profit or loss		0	0		136
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		6,000	6,000
Deposits		1	0
Insurance liabilities		39	37
KB-Brain KOSDAQ Scale-up New Technology Business Investment Fund
Related Party Transactions [Abstract]
Interest expense		40	89		21
Fee and commission income		734	735		108
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		8,097	13,118
Other liabilities		1	4
Spark Biopharma Inc.
Related Party Transactions [Abstract]
Interest expense	[1]	₩ 0	59		25
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
KB No.8 Special Purpose Acquisition Company
Related Party Transactions [Abstract]
Interest expense	[1]	₩ 0	0		17
Losses on financial instruments at fair value through profit or loss	[1]	₩ 0	0		2,330
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
KB No.9 Special Purpose Acquisition Company
Related Party Transactions [Abstract]
Interest expense	[1]	₩ 0	(23)		43
Gains on financial instruments at fair value through profit or loss	[1]	0	0		48
Losses on financial instruments at fair value through profit or loss	[1]	₩ 0	0		2,256
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
KB No.10 Special Purpose Acquisition Company
Related Party Transactions [Abstract]
Interest expense	[1]	₩ 0	18		30
Gains on financial instruments at fair value through profit or loss	[1]	₩ 0	3,066		121
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
KB No.11 Special Purpose Acquisition Company
Related Party Transactions [Abstract]
Interest expense	[1]	₩ 0	9		12
Gains on financial instruments at fair value through profit or loss	[1]	₩ 0	118		56
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
Hyundai-Tongyang Agrifood Private Equity Fund
Related Party Transactions [Abstract]
Fee and commission income	[1]	₩ 0	0		151
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
KB IGen Private Equity Fund No.1
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits	[2]	₩ 0	147
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020, therefore, the remaining outstanding balances with those entities are not disclosed.
Keystone-Hyundai Securities No. 1 Private Equity Fund
Related Party Transactions [Abstract]
Fee and commission income		₩ 115	90		116
Doosung Metal Co., Ltd.
Related Party Transactions [Abstract]
Insurance income	[1]	₩ 0	0		1
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
Jungdo Co., Ltd. [Member]
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		₩ 4	4
Bungaejangter. Inc.
Related Party Transactions [Abstract]
Interest income	[1]	₩ 0	0		60
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
COMPUTERLIFE Co., Ltd.
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		₩ 0	1
RMGP Bio-Pharma Investment, L.P.
Related Party Transactions [Abstract]
Losses on financial instruments at fair value through profit or loss		1	0		0
Other non-operating income		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		9	8
SKYDIGITAL INC.
Related Party Transactions [Abstract]
Fee and commission income		4	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		15	25
MJT&I Corp.
Related Party Transactions [Abstract]
Insurance income		0	1		0
KB No.17 Special Purpose Acquisition Company
Related Party Transactions [Abstract]
Interest expense		25	28		0
Fee and commission income		0	175		0
Gains on financial instruments at fair value through profit or loss		4	1,384		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		2,687	2,683
Deposits		1,711	1,742
Other liabilities		23	27
KB-KDBC Pre-IPO New Technology Business Investment Fund
Related Party Transactions [Abstract]
Interest expense		23	58		39
Fee and commission income		300	449		322
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		923	7,054
Other liabilities		0	4
Jo Yang Industrial Co., Ltd.
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		2	2
Fabric Time Co., Ltd.
Related Party Transactions [Abstract]
Interest expense		47	0		0
Fee and commission income		9	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		3,345	1,845
Loans measured at amortized cost (gross amount)		59	0
Deposits		3,947	395
Provisions		1	0
Other liabilities		40	2
KB No.18 Special Purpose Acquisition Company
Related Party Transactions [Abstract]
Interest expense		31	28		0
Fee and commission income		0	263		0
Gains on financial instruments at fair value through profit or loss		84	1,898		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		3,873	3,786
Deposits		2,101	2,140
Other liabilities		19	28
KB No.19 Special Purpose Acquisition Company
Related Party Transactions [Abstract]
Interest expense		13	8		0
Fee and commission income		0	150		0
Gains on financial instruments at fair value through profit or loss		11	1,044		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		2,055	2,043
Deposits		1,053	1,093
Other liabilities		3	7
KB No.20 Special Purpose Acquisition Company
Related Party Transactions [Abstract]
Interest expense		25	3		0
Fee and commission income		210	0		0
Gains on financial instruments at fair value through profit or loss		1,568	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		3,067	1,499
Deposits		1,716	1,984
Other liabilities		1	3
KB SPROTT Renewable Private Equity Fund No.1
Related Party Transactions [Abstract]
Fee and commission income		488	490		0
KB-Stonebridge Secondary Private Equity Fund [Member]
Related Party Transactions [Abstract]
Fee and commission income		1,442	1,444		0
CWhy Inc.
Related Party Transactions [Abstract]
Insurance income		0	3		0
Losses on financial instruments at fair value through profit or loss		2,000	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		0	2,000
Stratio, Inc.
Related Party Transactions [Abstract]
Interest expense		0	1		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		1,000	1,000
Deposits		13	726
NEXELON Inc.
Related Party Transactions [Abstract]
Interest expense	[1]	₩ 0	2		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
CellinCells Co., Ltd.
Related Party Transactions [Abstract]
Interest expense		₩ 4	19		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		2,000	2,000
Loans measured at amortized cost (gross amount)		24	4
Deposits		260	1,545
Other liabilities		0	1
Bomapp Inc.
Related Party Transactions [Abstract]
Interest expense		0	1		0
Fee and commission expense		9	0		0
Insurance income		8	1		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		1,999	1,999
Insurance liabilities		2	2
KB Social Impact Investment Fund
Related Party Transactions [Abstract]
Fee and commission income		300	121		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Other assets		0	73
KB-Solidus Global Healthcare Fund
Related Party Transactions [Abstract]
Fee and commission income		777	81		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Other assets		707	0
BNF Corporation Ltd.
Related Party Transactions [Abstract]
Interest income	[1]	401	7		0
Fee and commission income	[1]	2	0		0
Gains on financial instruments at fair value through profit or loss	[1]	0	158		0
Provision for credit losses	[1]	8	1		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss	[2]	0	2,259
Loans measured at amortized cost (gross amount)	[2]	0	1,400
Other assets	[2]	0	2
Deposits	[2]	0	947
Other liabilities	[2]	₩ 0	6
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020, therefore, the remaining outstanding balances with those entities are not disclosed.
KB Cape No.1 Private Equity Fund
Related Party Transactions [Abstract]
Fee and commission income	[1]	₩ 144	97		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		2,000	2,000
Other assets		144	0
ALS Co., Ltd.
Related Party Transactions [Abstract]
Interest income	[1]	₩ 0	194		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
Honest Fund, Inc.
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		₩ 3,999	3,999
MitoImmune Therapeutics
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		5,000	5,000
Bioprotect Ltd.
Related Party Transactions [Abstract]
Losses on financial instruments at fair value through profit or loss		216	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		3,264	0
KB-MDI Centauri Fund LP
Related Party Transactions [Abstract]
Fee and commission income		308	0		0
Losses on financial instruments at fair value through profit or loss		322	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		4,280	0
Other assets		308	0
S&E BIO
Related Party Transactions [Abstract]
Interest expense		1	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		2,000	0
Deposits		1,142	0
Contents First
Related Party Transactions [Abstract]
Interest expense		14	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		6,146	0
Deposits		1,823	0
Other liabilities		7	0
GENINUS Inc.
Related Party Transactions [Abstract]
Interest expense		70	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		5,599	0
Deposits		13,630	0
Other liabilities		15	0
COSES GT
Related Party Transactions [Abstract]
Interest income		6	0		0
Losses on financial instruments at fair value through profit or loss		0	5		0
Provision for credit losses		4	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		4,930	2,930
Loans measured at amortized cost (gross amount)		500	0
Allowances for credit losses		4	0
Other assets		1	0
Deposits		292	0
Insurance liabilities		1	0
WJ Private Equity Fund No.1
Related Party Transactions [Abstract]
Fee and commission income		5	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Other assets		2	0
Deposits		349	0
UPRISE, Inc.
Related Party Transactions [Abstract]
Interest income		2	0		0
Provision for credit losses		1	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		250	250
Loans measured at amortized cost (gross amount)		500	0
Allowances for credit losses		1	0
Deposits		11	0
KB-UTC Inno-Tech Venture Fund
Related Party Transactions [Abstract]
Fee and commission income		371	0		0
KBSP Private Equity Fund No.4
Related Party Transactions [Abstract]
Fee and commission income		480	0		0
KB-NAU Special Situation Corporate Restructuring Private Equity Fund
Related Party Transactions [Abstract]
Fee and commission income		237	0		0
JR GLOBAL REIT
Related Party Transactions [Abstract]
Fee and commission income		6,210	0		0
IGIS No.371 Professional Investors' Real Estate Investment Company
Related Party Transactions [Abstract]
Fee and commission income	[1]	₩ 200	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
Koreit Tower Real Estate Investment Trust Company
Related Party Transactions [Abstract]
Fee and commission income	[1]	₩ 2,852	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Description Of Transactions With Related Party		Excluded from the Group's related party as of December 31, 2020.
2020 KB Fintech Renaissance Fund
Related Party Transactions [Abstract]
Fee and commission income		₩ 60	0		0
KB Material and Parts No.1 PEF
Related Party Transactions [Abstract]
Fee and commission income		63	0		0
FineKB Private Equity Fund No.1
Related Party Transactions [Abstract]
Fee and commission income		38	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Other assets		38	0
Bluepointpartners Inc.
Related Party Transactions [Abstract]
Losses on financial instruments at fair value through profit or loss		68	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		1,432	0
Channel Corporation
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		4,551	2,000
GOMI CORPORATION
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		500	0
Loans measured at amortized cost (gross amount)		9	0
Deposits		37	0
Copin Communications, Inc.
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		1,500	0
Go2joy Co., Ltd.
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		1,200	0
ClavisTherapeutics, Inc.
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		2,000	0
4N Inc.
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		200	0
Deposits		76	0
Xenohelix Co., Ltd.
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		2,100	0
OKXE Inc.
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Financial assets at fair value through profit or loss		800	0
NEOMIO CORP.
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		535	0
December & Company Inc.
Related Party Transactions [Abstract]
Interest expense		1	0		0
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Deposits		1	0
Key management
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Loans measured at amortized cost (gross amount)		5,153	3,538
Allowances for credit losses		2	1
Other assets		5	3
Deposits		17,167	15,339
Insurance liabilities		2,501	1,984
Other liabilities		371	289
Retirement pension
Related Party Transactions [Abstract]
Interest expense		3	4		3
Fee and commission income		1,077	939		₩ 876
Outstanding Balances For Related Party Transactions Abstract [Abstract]
Other assets		295	366
Other liabilities		₩ 10,600	₩ 17,620
[1]	Excluded from the Group's related party as of December 31, 2020.
[2]	Excluded from the Group's related party as of December 31, 2020, therefore, the remaining outstanding balances with those entities are not disclosed.

Related Party Transactions_Sign

Related Party Transactions_Significant Loan Transactions With Related Parties(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Korea Credit Bureau Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		₩ 43	₩ 22
Increase		36	43
Decrease		(43)	(22)
Ending		36	43	₩ 22
Incheon Bridge Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		185,564	191,088
Increase		901	4,982
Decrease		(14,707)	(10,506)
Ending		171,758	185,564	191,088
KB Star Office Private Real Estate Investment Trust No.1
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		10,000	10,000
Increase		0	0
Decrease		0	0
Ending		10,000	10,000	10,000
RAND Bio Science Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1	1
Increase		1	1
Decrease		(1)	(1)
Ending		1	1	1
SY Auto Capital Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		41,990	48,356
Increase		11,310	28,088
Decrease		(13,240)	(34,454)
Ending		40,060	41,990	48,356
Food Factory Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		2,582	730
Increase		1,314	1,872
Decrease		(24)	(20)
Ending		3,872	2,582	730
Built On Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[1]	0	401
Increase	[1]		0
Decrease	[1]		(401)
Ending	[1]		₩ 0	₩ 401
Description Of Other Information Of Loans And Receivables Gross Amount Related Party Transactions			Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
Acts Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0	₩ 0
Increase		74	68
Decrease		(74)	(68)
Ending		0	0	₩ 0
Paycoms Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1,157	1,032
Increase		69	125
Decrease		0	0
Ending		1,226	1,157	1,032
Big Dipper Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		11	5
Increase		4	11
Decrease		(11)	(5)
Ending		4	11	5
JLK Inspection Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[1]	0	7,300
Increase	[1]		(7,300)
Decrease	[1]		0
Ending	[1]		₩ 0	₩ 7,300
Description Of Other Information Of Loans And Receivables Gross Amount Related Party Transactions			Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
TESTIAN Inc. [Member]
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[1]	0	₩ 615
Increase	[1]		24
Decrease	[1]		(639)
Ending	[1]		₩ 0	₩ 615
Description Of Other Information Of Loans And Receivables Gross Amount Related Party Transactions			Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
RMGP Bio-Pharma Investment Fund, L.P.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		3,419	₩ 3,051
Increase		831	368
Decrease		0	0
Ending		4,250	3,419	₩ 3,051
RMGP Bio-Pharma Investment, L.P.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		8	4
Increase		1	4
Decrease		0	0
Ending		9	8	4
Hasys.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		6,000	5,864
Increase		0	136
Decrease		0	0
Ending		6,000	6,000	5,864
Rainist Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		7,504	2,504
Increase		1,637	5,000
Decrease		0	0
Ending		9,141	7,504	2,504
Spark Biopharma Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[1]	0	6,500
Increase	[1]		(6,500)
Decrease	[1]		0
Ending	[1]		₩ 0	₩ 6,500
Description Of Other Information Of Loans And Receivables Gross Amount Related Party Transactions			Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
Stratio, Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1,000	₩ 1,000
Increase		0	0
Decrease		0	0
Ending		1,000	1,000	₩ 1,000
KB No.9 Special Purpose Acquisition Company
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[1]	0	2,481
Increase	[1]		0
Decrease	[1]		(2,481)
Ending	[1]		₩ 0	₩ 2,481
Description Of Other Information Of Loans And Receivables Gross Amount Related Party Transactions			Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
KB No.10 Special Purpose Acquisition Company
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[1]	0	₩ 2,025
Increase	[1]		0
Decrease	[1]		(2,025)
Ending	[1]		₩ 0	₩ 2,025
Description Of Other Information Of Loans And Receivables Gross Amount Related Party Transactions			Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
KB No.11 Special Purpose Acquisition Company
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[1]	0	₩ 737
Increase	[1]		0
Decrease	[1]		(737)
Ending	[1]		₩ 0	₩ 737
Description Of Other Information Of Loans And Receivables Gross Amount Related Party Transactions			Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
KB Cape No.1 Private Equity Fund
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		2,000	₩ 0
Increase		0	2,000
Decrease		0	0
Ending		2,000	2,000	₩ 0
APRO Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[1]	2,019	0
Increase	[1]	2,000	2,019
Decrease	[1]	(4,019)	0
Ending	[1]	₩ 0	₩ 2,019	₩ 0
Description Of Other Information Of Loans And Receivables Gross Amount Related Party Transactions		Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
Honest Fund, Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		₩ 3,999	₩ 0
Increase		0	3,999
Decrease		0	0
Ending		3,999	3,999	₩ 0
CellinCells Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		2,004	0
Increase		24	2,004
Decrease		(4)	0
Ending		2,024	2,004	0
KB No.17 Special Purpose Acquisition Company
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		2,683	0
Increase		4	2,683
Decrease		0	0
Ending		2,687	2,683	0
KB No.18 Special Purpose Acquisition Company
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		3,786	0
Increase		87	3,786
Decrease		0	0
Ending		3,873	3,786	0
KB No.19 Special Purpose Acquisition Company
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		2,043	0
Increase		12	2,043
Decrease		0	0
Ending		2,055	2,043	0
KB No.20 Special Purpose Acquisition Company
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1,499	0
Increase		1,568	1,499
Decrease		0	0
Ending		3,067	1,499	0
COSES GT
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		2,930	0
Increase		2,500	2,930
Decrease		0	0
Ending		5,430	2,930	0
CWhy Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		2,000	0
Increase		0	2,000
Decrease		(2,000)	0
Ending		0	2,000	0
Bomapp Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1,999	0
Increase		0	1,999
Decrease		0	0
Ending		1,999	1,999	0
MitoImmune Therapeutics
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		5,000	0
Increase		0	5,000
Decrease		0	0
Ending		5,000	5,000	0
Fabric Time Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1,845	0
Increase		1,559	1,845
Decrease		0	0
Ending		3,404	1,845	0
BNF Corporation Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[1]	3,659	0
Increase	[1]	1,000	3,659
Decrease	[1]	(4,659)	0
Ending	[1]	₩ 0	₩ 3,659	₩ 0
Description Of Other Information Of Loans And Receivables Gross Amount Related Party Transactions		Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
CARLIFE Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		₩ 0
Increase		22
Decrease		(22)
Ending		0	₩ 0
UPRISE, Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		250	250
Increase		500	0
Decrease		0	0
Ending		750	250	₩ 250
Channel Corporation
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		2,000	0
Increase		2,551	2,000
Decrease		0	0
Ending		4,551	2,000	0
Bioprotect Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		3,264
Decrease		0
Ending		3,264	0
GOMI CORPORATION
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		509
Decrease		0
Ending		509	0
Copin Communications, Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		1,500
Decrease		0
Ending		1,500	0
Go2joy Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		1,200
Decrease		0
Ending		1,200	0
ClavisTherapeutics, Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		2,000
Decrease		0
Ending		2,000	0
S&E BIO
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		2,000
Decrease		0
Ending		2,000	0
Bluepointpartners Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		1,432
Decrease		0
Ending		1,432	0
4N Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		200
Decrease		0
Ending		200	0
Xenohelix Co., Ltd.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		2,100
Decrease		0
Ending		2,100	0
Contents First
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		6,146
Decrease		0
Ending		6,146	0
KB-MDI Centauri Fund LP
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		4,280
Decrease		0
Ending		4,280	0
OKXE Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		800
Decrease		0
Ending		800	0
GENINUS Inc.
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0
Increase		5,599
Decrease		0
Ending		5,599	0
Key management
Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		3,538	2,404
Increase		5,141	2,006
Decrease		(3,526)	(872)
Ending		₩ 5,153	₩ 3,538	₩ 2,404
[1]	Excluded from the Group's related party as of December 31, 2020.

Related Party Transactions_Si_2

Related Party Transactions_Significant Borrowing Transactions With Related Parties(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Korea Credit Bureau Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		₩ 17,966	₩ 15,674
Borrowing		1,000	0
Repayment		0	(3,000)
Others	[1]	1,016	5,292
Ending		19,982	17,966
Incheon Bridge Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		45,447	43,666
Borrowing		20,000	25,260
Repayment		(21,260)	(5,260)
Others	[1]	(4,667)	(18,219)
Ending		39,520	45,447
Terra Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Repayment		0
NEXELON Inc.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[2]	0	0
Borrowing	[2]		0
Repayment		0	(200)	[2]
Others	[1],[2]		200
Ending	[2]		0
Jo Yang Industrial Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		2	0
Borrowing		0	0
Repayment		0	0
Others	[1]	0	2
Ending		2	2
Fabric Time Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		395	0
Borrowing		7,002	0
Repayment		(3,801)	0
Others	[1]	351	395
Ending		3,947	395
BNF Corporation Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[2]	947	0
Borrowing	[2]	0	0
Repayment	[2]	0	0
Others	[1],[2]	(947)	947
Ending	[2]	0	947
KB No.17 Special Purpose Acquisition Company
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1,742	0
Borrowing		1,525	1,500
Repayment		(1,500)	0
Others	[1]	(56)	242
Ending		1,711	1,742
KB No.18 Special Purpose Acquisition Company
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		2,140	0
Borrowing		2,063	2,200
Repayment		(2,100)	(100)
Others	[1]	(2)	40
Ending		2,101	2,140
KB No.19 Special Purpose Acquisition Company
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1,093	0
Borrowing		1,000	1,000
Repayment		(1,000)	0
Others	[1]	(40)	93
Ending		1,053	1,093
KB No.20 Special Purpose Acquisition Company
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1,984	0
Borrowing		1,522	1,500
Repayment		(1,500)	0
Others	[1]	(290)	484
Ending		1,716	1,984
CellinCells Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1,545	0
Borrowing		0	0
Repayment		0	0
Others	[1]	(1,285)	1,545
Ending		260	1,545
Stratio, Inc.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		726	516
Borrowing		0	0
Repayment		0	0
Others	[1]	(713)	210
Ending		13	726
Jungdong Steel Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Repayment		0
Jungdo Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		4	4
Borrowing		0	0
Repayment		0	0
Others	[1]	0	0
Ending		4	4
Dae-A Leisure Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		753	1,229
Borrowing		0	0
Repayment		0	0
Others	[1]	(117)	(476)
Ending		636	753
Daesang Techlon Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Repayment		0
Aju Good Technology Venture Fund
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		5,456	6,439
Borrowing		1,442	0
Repayment		0	0
Others	[1]	(3,805)	(983)
Ending		3,093	5,456
KB Pre IPO Secondary Venture Fund No.1
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		2,955	1,115
Borrowing		0	0
Repayment		0	0
Others	[1]	(2,326)	1,840
Ending		629	2,955
KB Star Office Private Real Estate Investment Trust No.1
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		8,293	7,946
Borrowing		2,117	5,018
Repayment		(5,630)	(5,072)
Others	[1]	(525)	401
Ending		4,255	8,293
KB No.8 Special Purpose Acquisition Company
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Repayment		0
KB No.9 Special Purpose Acquisition Company
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[2]	0	2,275
Borrowing	[2]		0
Repayment		0	(2,266)	[2]
Others	[1],[2]		(9)
Ending	[2]		0
KB No.10 Special Purpose Acquisition Company
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[2]	0	1,666
Borrowing	[2]		0
Repayment		0	(1,618)	[2]
Others	[1],[2]		(48)
Ending	[2]		0
KB No.11 Special Purpose Acquisition Company
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[2]	0	658
Borrowing	[2]		0
Repayment		0	(530)	[2]
Others	[1],[2]		(128)
Ending	[2]		0
SY Auto Capital Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		8	5
Borrowing		0	0
Repayment		0	0
Others	[1]	(2)	3
Ending		6	8
RAND Bio Science Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		4,452	232
Borrowing		2,250	1,900
Repayment		(3,750)	0
Others	[1]	(2,259)	2,320
Ending		693	4,452
Wise Asset Management Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		21	696
Borrowing		0	0
Repayment		0	(682)
Others	[1]	(21)	7
Ending		0	21
Built On Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[2]	0	7
Borrowing	[2]		0
Repayment		0	0	[2]
Others	[1],[2]		(7)
Ending	[2]		0
Food Factory Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1,073	68
Borrowing		1,503	0
Repayment		(1,003)	0
Others	[1]	(18)	1,005
Ending		1,555	1,073
Acts Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1	29
Borrowing		0	0
Repayment		0	0
Others	[1]	17	(28)
Ending		18	1
Big Dipper Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		6	182
Borrowing		0	0
Repayment		0	0
Others	[1]	(5)	(176)
Ending		1	6
POSCO-KB Shipbuilding Fund
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Repayment		0
Inno Lending Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Repayment		0
Doosung Metal Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0	3
Borrowing			0
Repayment		0	0
Others	[1]		(3)
Ending			0
CARLIFE Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0	2
Borrowing			0
Repayment		0	0
Others	[1]		(2)
Ending			0
COMPUTERLIFE Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1	1
Borrowing		0	0
Repayment		0	0
Others	[1]	(1)	0
Ending		0	1
SKYDIGITAL INC.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		25	16
Borrowing		0	0
Repayment		0	0
Others	[1]	(10)	9
Ending		15	25
KB-KDBC Pre-IPO New Technology Business Investment Fund
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		7,054	7,088
Borrowing		1,500	15,000
Repayment		(6,500)	(10,000)
Others	[1]	(1,131)	(5,034)
Ending		923	7,054
KB-Brain KOSDAQ Scale-up New Technology Business Investment Fund
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		13,118	18,813
Borrowing		0	0
Repayment		0	0
Others	[1]	(5,021)	(5,695)
Ending		8,097	13,118
Paycoms Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		1	1
Borrowing		0	0
Repayment		0	0
Others	[1]	0	0
Ending		1	1
APRO Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[2]	3,201	2,201
Borrowing	[2]	0	0
Repayment	[2]	0	0
Others	[1],[2]	(3,201)	1,000
Ending	[2]	0	3,201
Rainist Co., Ltd.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		0	1
Borrowing			0
Repayment		0	0
Others	[1]		(1)
Ending			0
Spark Biopharma Inc.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[2]	0	2,630
Borrowing	[2]		17,000
Repayment		0	(9,000)	[2]
Others	[1],[2]		(10,630)
Ending	[2]		0
KB IGen Private Equity Fund No.1
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning	[2]	147	148
Borrowing	[2]	0	0
Repayment	[2]	0	0
Others	[1],[2]	(147)	(1)
Ending	[2]	0	147
NEOMIO CORP.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Borrowing		0
Repayment		0
Others	[1]	535
Ending		535
WJ Private Equity Fund No.1
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Borrowing		0
Repayment		0
Others	[1]	349
Ending		349
Hasys.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Borrowing		0
Repayment		0
Others	[1]	1
Ending		1
UPRISE, Inc.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Borrowing		0
Repayment		0
Others	[1]	11
Ending		11
COSES GT
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Borrowing		0
Repayment		0
Others	[1]	292
Ending		292
GOMI CORPORATION
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Borrowing		0
Repayment		0
Others	[1]	37
Ending		37
S&E BIO
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Borrowing		0
Repayment		0
Others	[1]	1,142
Ending		1,142
4N Inc.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Borrowing		0
Repayment		0
Others	[1]	76
Ending		76
Contents First
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Borrowing		4,000
Repayment		(3,000)
Others	[1]	823
Ending		1,823
December & Company Inc.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Borrowing		0
Repayment		0
Others	[1]	1
Ending		1
GENINUS Inc.
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Borrowing		0
Repayment		0
Others	[1]	13,630
Ending		13,630
Key management
Borrowings And Receivables Gross Amount Related Party Transactions Abstract [Abstract]
Beginning		15,338	13,818
Borrowing		21,319	13,520
Repayment		(20,410)	(14,611)
Others	[1]	920	2,611
Ending		₩ 17,167	₩ 15,338
[1]	Transactions between related parties, such as settlements arising from operating activities and deposits, are expressed in net amount.
[2]	Excluded from the Group's related party as of December 31, 2020.

Related Party Transactions_Si_3

Related Party Transactions_Significant Investment And Collection Transactions With Related Parties(Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Korea Credit Bureau Co., Ltd.
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		₩ 0	₩ 0
Withdrawal and others		90	135
Balhae Infrastructure Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		894	592
Withdrawal and others		6,973	6,855
KB SPROTT Renewable Private Equity Fund No.1
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		4,129	1,667
Withdrawal and others		0	0
KB Social Impact Investment Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		1,500	1,500
Withdrawal and others		0	0
KBSP Private Equity Fund No.4
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		0	6,100
Withdrawal and others		0	0
KB-Stonebridge Secondary Private Equity Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		9,093	7,070
Withdrawal and others		0	1,855
KB No.9 Special Purpose Acquisition Company
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments	[1]	0	0
Withdrawal and others	[1]	₩ 0	₩ 16
Description Of Other Information Of Investments And Collections Gross Amount Related Party Transactions		Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
KB No.17 Special Purpose Acquisition Company
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		₩ 0	₩ 1
Withdrawal and others		0	0
KB No.18 Special Purpose Acquisition Company
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		0	1
Withdrawal and others		0	0
KB No.19 Special Purpose Acquisition Company
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		0	1
Withdrawal and others		0	0
KB No.20 Special Purpose Acquisition Company
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		0	1
Withdrawal and others		0	0
KB Cape No.1 Private Equity Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		0	2,000
Withdrawal and others		0	0
KB-Solidus Global Healthcare Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		10,920	10,400
Withdrawal and others		4,940	13,520
KB-UTC Inno-Tech Venture Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		16,965	450
Withdrawal and others		0	0
KB-KDBC Pre-IPO New Technology Business Investment Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		0	5,000
Withdrawal and others		6,400	0
POSCO-KB Shipbuilding Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		5,000	2,500
Withdrawal and others		2,125	0
KoFC KBIC Frontier Champ 2010-5(PEF)
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments	[1]	0	0
Withdrawal and others	[1]	₩ 0	₩ 138
Description Of Other Information Of Investments And Collections Gross Amount Related Party Transactions		Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
KB GwS Private Securities Investment Trust
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		₩ 0	₩ 0
Withdrawal and others		9,523	7,276
Aju Good Technology Venture Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		0	1,960
Withdrawal and others		2,885	0
KB-TS Technology Venture Private Equity Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		2,240	7,840
Withdrawal and others		5,488	2,240
KB-Brain KOSDAQ Scale-up New Technology Business Investment Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		8,000	14,000
Withdrawal and others		3,200	0
KB Star Office Private Real Estate Investment Trust No.1
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		0	0
Withdrawal and others		1,273	1,275
KB-SJ Tourism Venture Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		1,500	1,500
Withdrawal and others		0	0
KB Pre IPO Secondary Venture Fund No.1
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		0	0
Withdrawal and others		585	0
WJ Private Equity Fund No.1
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		10,000	0
Withdrawal and others		0	0
KB-NAU Special Situation Corporate Restructuring Private Equity Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		5,700	0
Withdrawal and others		0	0
IGIS No.371 Professional Investors' Real Estate Investment Company
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments	[1]	10,000	0
Withdrawal and others	[1]	₩ 10,000	₩ 0
Description Of Other Information Of Investments And Collections Gross Amount Related Party Transactions		Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
Koreit Tower Real Estate Investment Trust Company
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments	[1]	₩ 30,000	₩ 0
Withdrawal and others	[1]	₩ 30,000	₩ 0
Description Of Other Information Of Investments And Collections Gross Amount Related Party Transactions		Excluded from the Group's related party as of December 31, 2020.	Excluded from the Group's related party as of December 31, 2020.
Project Vanilla Co., Ltd.
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		₩ 2,450	₩ 0
Withdrawal and others		0	0
December & Company Inc.
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		30,000	0
Withdrawal and others		0	0
2020 KB Fintech Renaissance Fund
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		550	0
Withdrawal and others		0	0
KB Material and Parts No.1 PEF
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		3,400	0
Withdrawal and others		0	0
KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No. 2
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		0	0
Withdrawal and others		3,230	0
All Together Korea Fund No.2
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		100,000	0
Withdrawal and others		90,127	0
JR GLOBAL REIT
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		219,493	0
Withdrawal and others		3,639	0
KB Private Equity Fund No.3
Investments And Collections Gross Amount Related Party Transactions Abstract [Abstract]
Equity investments		0	0
Withdrawal and others		₩ 8,000	₩ 0
[1]	Excluded from the Group's related party as of December 31, 2020.

Related Party Transactions_Unus

Related Party Transactions_Unused Commitments To Related Parties(Details) ₩ in Millions		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2019USD ($)
Balhae Infrastructure Fund
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		₩ 6,433		₩ 7,327
Korea Credit Bureau Co., Ltd.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Unused lines Of Credit for credit Card		564		557
KB GwS Private Securities Investment Trust
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		0		876
Aju Good Technology Venture Fund
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		0		1,154
Incheon Bridge Co., Ltd.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Loan commitments in Korean won		20,000		20,000
Unused lines Of Credit for credit Card		98		93
KoFC POSCO HANWHA KB Shared Growth Private Equity Fund No. 2
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Commitments On Loss Absorption Priority		14,980		10,000
Purchase Of Securities		0		12,550
SY Auto Capital Co., Ltd.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Loan commitments in Korean won		0		8,100
Unused lines Of Credit for credit Card		90		60
KB No.18 Special Purpose Acquisition Company
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Unused lines Of Credit for credit Card		15		15
KB No.19 Special Purpose Acquisition Company
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Unused lines Of Credit for credit Card		0		1
CellinCells Co., Ltd.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Unused lines Of Credit for credit Card		0		20
RAND Bio Science Co., Ltd.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Unused lines Of Credit for credit Card		24		24
Food Factory Co., Ltd.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Loan commitments in Korean won		388		0
Unused lines Of Credit for credit Card		73		25
Big Dipper Co., Ltd.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Unused lines Of Credit for credit Card		96		89
KB Pre IPO Secondary Venture Fund No.1
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Commitments On Loss Absorption Priority		1,671		1,671
POSCO-KB Shipbuilding Fund
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		0		5,000
KB-TS Technology Venture Private Equity Fund
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		3,696		5,936
KB-SJ Tourism Venture Fund
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		500		2,000
KB-Brain KOSDAQ Scale-up New Technology Business Investment Fund
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		10,000		18,000
KB SPROTT Renewable Private Equity Fund No.1
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		18,704		22,833
KB-Stonebridge Secondary Private Equity Fund
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		18,837		27,930
KB Social Impact Investment Fund
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		1,500		3,000
BNF Corporation Ltd.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Loan commitments in Korean won	[1]	0		360
APRO Co., Ltd.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Unused lines Of Credit for credit Card	[1]	0		96
KB-UTC Inno-Tech Venture Fund
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		5,085		22,050
KB-Solidus Global Healthcare Fund
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		2,120		24,700
RMGP Bio-Pharma Investment Fund, L.P.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities | $			$ 7,796,423		$ 8,911,002
RMGP Bio-Pharma Investment, L.P.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities | $			17,132		13,150
KB No.17 Special Purpose Acquisition Company
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Unused lines Of Credit for credit Card		441		0
Fabric Time Co., Ltd.
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Unused lines Of Credit for credit Card		7		0
KB-NAU Special Situation Corporate Restructuring Private Equity Fund
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		24,300		0
All Together Korea Fund No.2
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		990,000		0
FineKB Private Equity Fund No.1
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities		25,000		0
KB-MDI Centauri Fund LP
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Purchase Of Securities | $			$ 13,537,500		$ 0
Key management
Disclosure Of Unused Commitments To Related Parties Line Items [Line Items]
Loan commitments in Korean won		₩ 1,760		₩ 1,695
[1]	Excluded from the Group's related party as of December 31, 2020.

Related Party Transactions_Comp

Related Party Transactions_Compensation To Key Management(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Amounts Incurred By Entity For Provision Of Key Management Personnel Services Provided By Separate Management Entities Line Items [Line Items]
Short-term employee benefits	₩ 20,026	₩ 18,727	₩ 15,852
Post-employment benefits	1,068	785	691
Share-based payments	13,303	14,944	7,527
Total	34,397	34,456	24,070
Registered directors (executive)
Disclosure Of Amounts Incurred By Entity For Provision Of Key Management Personnel Services Provided By Separate Management Entities Line Items [Line Items]
Short-term employee benefits	8,111	8,540	7,757
Post-employment benefits	672	425	418
Share-based payments	6,369	7,434	4,213
Total	15,152	16,399	12,388
Registered directors (non-executive)
Disclosure Of Amounts Incurred By Entity For Provision Of Key Management Personnel Services Provided By Separate Management Entities Line Items [Line Items]
Short-term employee benefits	1,133	1,030	960
Post-employment benefits	0	0	0
Share-based payments	0	0	0
Total	1,133	1,030	960
Non-registered directors
Disclosure Of Amounts Incurred By Entity For Provision Of Key Management Personnel Services Provided By Separate Management Entities Line Items [Line Items]
Short-term employee benefits	10,782	9,157	7,135
Post-employment benefits	396	360	273
Share-based payments	6,934	7,510	3,314
Total	₩ 18,112	₩ 17,027	₩ 10,722

Related Party Transactions_Coll

Related Party Transactions_Collateral Received From Related Parties(Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
KB Star Office Private Real Estate Investment Trust No.1 | Real estate
Details Of Collateral Received From Related Parties Line Items [Line Items]
Provision Of Guarantees Or Collateral To Entity Related Party Transactions	₩ 13,000	₩ 13,000
Incheon Bridge Co., Ltd.
Details Of Collateral Received From Related Parties Line Items [Line Items]
senior collateral	611,000
subordinated collateral	384,800
certificate of credit guarantee	400,000
Key management | Time deposits and others
Details Of Collateral Received From Related Parties Line Items [Line Items]
Provision Of Guarantees Or Collateral To Entity Related Party Transactions	213	192
Key management | Real estate
Details Of Collateral Received From Related Parties Line Items [Line Items]
Provision Of Guarantees Or Collateral To Entity Related Party Transactions	₩ 4,356	₩ 2,922

Business Combination_Details of

Business Combination_Details of Business Combination(Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)
Information of business combination
Name Of Acquiree		Acquisition of PRASAC Microfinance Institution Plc. (PRASAC)	Acquisition of PRASAC Microfinance Institution Plc. (PRASAC)
Recognized amounts of identifiable assets acquired and liabilities assumed
Goodwill	[1]	₩ 763,582		₩ 275,741
Gains on bargain purchase	[2]	₩ 145,067	$ 133,566	0	₩ 0
Prudential Life Insurance Company of Korea Ltd.
Information of business combination
Name Of Acquiree		Prudential Life Insurance Company of Korea Ltd.	Prudential Life Insurance Company of Korea Ltd.
Description of acquiree		Life Insurance Company of Korea	Life Insurance Company of Korea
Date of acquisition		Aug. 31, 2020	Aug. 31, 2020
Percentage Of Voting Equity Interests Acquired		100.00%
Description Of How Acquirer Obtained Control Of Acquiree		On August 26, 2020, the Group obtained an approval from the Financial Services Commission to acquire Prudential Life Insurance Company of Korea Ltd. On August 31, 2020, the Group acquired 100 percent share in the subsidiary through purchase of shares and obtained control.	On August 26, 2020, the Group obtained an approval from the Financial Services Commission to acquire Prudential Life Insurance Company of Korea Ltd. On August 31, 2020, the Group acquired 100 percent share in the subsidiary through purchase of shares and obtained control.
Description of primary reasons for business combination		The main purpose of the business combination is to improve competitiveness of life insurance business by including the acquiree into subsidiaries of the Group.	The main purpose of the business combination is to improve competitiveness of life insurance business by including the acquiree into subsidiaries of the Group.
Consideration
Cash		₩ 2,299,541
Total consideration transferred		2,299,541
Recognized amounts of identifiable assets acquired and liabilities assumed
Cash and due from financial institutions		574,204
Financial assets at fair value through profit or loss		503,853
Financial assets at fair value through other comprehensive income		7,195,958
Securities measured at amortized cost		10,064,300
Derivative assets		389
Loans measured at amortized cost		759,869
Property and equipment		178,537
Intangible assets	[3]	10,382
Other assets		4,931,131
Total assets		24,218,623
Insurance liabilities	[4]	16,752,888
Derivative liabilities		1,166
Other liabilities		5,019,961
Total liabilities		21,774,015
Total identifiable net assets		2,444,608
Non-controlling interests		0
Gains on bargain purchase	[5]	145,067
Details of intangible assets recognized as the result of the business combination
VOBA	[6]	(2,807,162)
Others	[7]	10,382
Total		(2,796,780)
Details of business combination acquisition related profit or loss
Expenses		10,183
Reflected operating income (loss) of Acquiree for the period after the acquisition date		92,535
Reflected net profit (loss) of Acquiree for the period after the acquisition date		55,711
Operating income (loss) assuming consolidated from the beginning of the current period		529,678
Net profit (loss) assuming consolidated from the beginning of the current period		₩ 386,864
PRASAC Microfinance Institution Plc.
Information of business combination
Name Of Acquiree		PRASAC Microfinance Institution Plc (PRASAC)	PRASAC Microfinance Institution Plc (PRASAC)
Description of acquiree		a microfinance company in Cambodia	a microfinance company in Cambodia
Date of acquisition		Apr. 10, 2020	Apr. 10, 2020
Percentage Of Voting Equity Interests Acquired		70.00%
Description Of How Acquirer Obtained Control Of Acquiree		The Group has signed an agreement with the existing shareholders of PRASAC. The existing shareholders have the right of put option to sell 30% of the remaining shares to the Group, and they are entitled to exercise their rights at the exercise price calculated on the basis of the adjusted book value of net asset as of 2021 year-end, within six months from the issue date of the audit report or the confirmation date of the adjusted value. If the put option is not exercised until its expiry, the Group has a right to exercise a call option during the six months following the expiry of such put option. All shareholders are restricted from selling shares or additional pledge before exercising the put option and call option. In addition, the Group has agreed to pay dividends to existing shareholders of PRASAC for 30% of the amount exceeding USD 370 million based on the adjusted carrying value of net asset and this payment can be added to the exercised price of put option in accordance with the shareholders' agreement.	The Group has signed an agreement with the existing shareholders of PRASAC. The existing shareholders have the right of put option to sell 30% of the remaining shares to the Group, and they are entitled to exercise their rights at the exercise price calculated on the basis of the adjusted book value of net asset as of 2021 year-end, within six months from the issue date of the audit report or the confirmation date of the adjusted value. If the put option is not exercised until its expiry, the Group has a right to exercise a call option during the six months following the expiry of such put option. All shareholders are restricted from selling shares or additional pledge before exercising the put option and call option. In addition, the Group has agreed to pay dividends to existing shareholders of PRASAC for 30% of the amount exceeding USD 370 million based on the adjusted carrying value of net asset and this payment can be added to the exercised price of put option in accordance with the shareholders' agreement.
Description of primary reasons for business combination		The main purpose of the business combination is to improve competitiveness of global business by maximizing the operational synergy with foreign subsidiaries.	The main purpose of the business combination is to improve competitiveness of global business by maximizing the operational synergy with foreign subsidiaries.
Consideration
Cash		₩ 733,976
Total consideration transferred		733,976
Recognized amounts of identifiable assets acquired and liabilities assumed
Cash and due from financial institutions		658,865
Loans measured at amortized cost		3,194,211
Financial investments		35
Property and equipment		24,472
Intangible assets		1,821
Current income tax assets		873
Deferred income tax assets		26,330
Other assets		37,325
Total assets		3,943,932
Deposits From Customers Recognised As Of Acquisition Date		2,222,944
Borrowings		1,038,684
Debentures		89,570
Current income tax liabilities		9,238
Deferred income tax liabilities		323
Other liabilities		101,696
Total liabilities		3,462,455
Total identifiable net assets		481,477
Non-controlling interests	[8]	144,443
Goodwill	[9]	396,942
Details of business combination acquisition related profit or loss
Reflected operating income (loss) of Acquiree for the period after the acquisition date		147,571
Reflected net profit (loss) of Acquiree for the period after the acquisition date		118,339
The amount attributed to net profit (loss) to Shareholders of the Parent Company after the acquisition date		82,837
Operating income (loss) assuming consolidated from the beginning of the current period		183,735
Net profit (loss) assuming consolidated from the beginning of the current period		147,383
The amount attributed to net profit (loss) to Shareholders of the Parent Company Assuming consolidated from the beginning of the current period		103,168
PRASAC Microfinance Institution Plc. | Acquiree's carrying amount of loans
Recognized amounts of identifiable assets acquired and liabilities assumed
Loans measured at amortized cost		3,294,798
PRASAC Microfinance Institution Plc. | Present value of contractual cash flows not expected to be paid
Recognized amounts of identifiable assets acquired and liabilities assumed
Loans measured at amortized cost		₩ (100,587)
PT Bank Bukopin TBK
Information of business combination
Name Of Acquiree		PT Bank Bukopin TBK	PT Bank Bukopin TBK
Description of acquiree		operates a banking business in Indonesia	operates a banking business in Indonesia
Date of acquisition		Sep. 2, 2020	Sep. 2, 2020
Percentage Of Voting Equity Interests Acquired		67.00%
Description Of How Acquirer Obtained Control Of Acquiree		At the Board of Directors meeting held on July 16, 2020, the Group has decided to acquire additional ordinary shares of PT Bank Bukopin TBK, the Group's associate, which operates a banking business in Indonesia, through issuance of shares in the form of an allotment to shareholders (1st) and an allotment to the third party (2nd). Accordingly, the Group acquired 2,967,600,372 ordinary shares for IDR 534,168,066,960 (KRW 43,909 million) from issuance of shares in the form of an allotment to shareholders (1st) on July 30, 2020, and 16,360,578,947 ordinary shares for IDR 3,108,509,999,930 (KRW 252,722 million) from issuance of shares in the form of an allotment to the third party (2nd) on September 2, 2020. The Group secured 67.00% of PT Bank Bukopin TBK through paid-in capital increase twice, and PT Bank Bukopin TBK became a subsidiary of the Group on September 2, 2020.	At the Board of Directors meeting held on July 16, 2020, the Group has decided to acquire additional ordinary shares of PT Bank Bukopin TBK, the Group's associate, which operates a banking business in Indonesia, through issuance of shares in the form of an allotment to shareholders (1st) and an allotment to the third party (2nd). Accordingly, the Group acquired 2,967,600,372 ordinary shares for IDR 534,168,066,960 (KRW 43,909 million) from issuance of shares in the form of an allotment to shareholders (1st) on July 30, 2020, and 16,360,578,947 ordinary shares for IDR 3,108,509,999,930 (KRW 252,722 million) from issuance of shares in the form of an allotment to the third party (2nd) on September 2, 2020. The Group secured 67.00% of PT Bank Bukopin TBK through paid-in capital increase twice, and PT Bank Bukopin TBK became a subsidiary of the Group on September 2, 2020.
Description of primary reasons for business combination		The main purpose of the business combination is to improve competitiveness of global business by maximizing the operational synergy with foreign subsidiaries.	The main purpose of the business combination is to improve competitiveness of global business by maximizing the operational synergy with foreign subsidiaries.
Consideration
Fair value of existing shares at the time of exchange		₩ 78,446
Cash		252,722
Total consideration transferred		331,168
Recognized amounts of identifiable assets acquired and liabilities assumed
Cash and due from financial institutions		300,424
Financial assets at fair value through profit or loss		3,960
Derivative assets		130
Loans measured at amortized cost		4,256,209
Financial investments		469,625
Property and equipment		280,197
Intangible assets		99,085
Deferred income tax assets		25,350
Assets held for sale		183,642
Other assets		272,775
Total assets		5,891,397
Deposits From Customers Recognised As Of Acquisition Date		4,253,557
Borrowings		838,142
Debentures		141,806
Provisions		3,522
Net defined benefit liabilities		15,141
Other liabilities		276,336
Total liabilities		5,528,504
Total identifiable net assets		362,893
Non-controlling interests	[10]	120,945
Goodwill	[9]	89,220
Details of business combination acquisition related profit or loss
Reflected operating income (loss) of Acquiree for the period after the acquisition date		(61,051)
Reflected net profit (loss) of Acquiree for the period after the acquisition date		(43,402)
The amount attributed to net profit (loss) to Shareholders of the Parent Company after the acquisition date		(29,223)
Operating income (loss) assuming consolidated from the beginning of the current period		(190,584)
Net profit (loss) assuming consolidated from the beginning of the current period		(146,227)
The amount attributed to net profit (loss) to Shareholders of the Parent Company Assuming consolidated from the beginning of the current period		(97,981)
Gain on investment in associates measuring share held before the business combination	[11]	30,277
PT Bank Bukopin TBK | Acquiree's carrying amount of loans
Recognized amounts of identifiable assets acquired and liabilities assumed
Loans measured at amortized cost		5,053,321
PT Bank Bukopin TBK | Present value of contractual cash flows not expected to be paid
Recognized amounts of identifiable assets acquired and liabilities assumed
Loans measured at amortized cost		(797,112)
PT Bank Bukopin TBK | Core deposits
Recognized amounts of identifiable assets acquired and liabilities assumed
Intangible assets	[12]	95,477
PT Bank Bukopin TBK | Other assets
Recognized amounts of identifiable assets acquired and liabilities assumed
Intangible assets	[13]	₩ 3,608
PT. Finansia Multi Finance
Information of business combination
Name Of Acquiree		PT. Finansia Multi Finance	PT. Finansia Multi Finance
Description of acquiree		engaged in financial services in Indonesia	engaged in financial services in Indonesia
Date of acquisition		Jul. 3, 2020	Jul. 3, 2020
Percentage Of Voting Equity Interests Acquired		80.00%
Description Of How Acquirer Obtained Control Of Acquiree		On July 3, 2020, the Group acquired 80 percent share in PT. Finansia Multi Finance, which is engaged in financial services in Indonesia, and obtained control.	On July 3, 2020, the Group acquired 80 percent share in PT. Finansia Multi Finance, which is engaged in financial services in Indonesia, and obtained control.
Description of primary reasons for business combination		The main purpose of the business combination is to improve competitiveness of global business by maximizing the operational synergy with foreign subsidiaries.	The main purpose of the business combination is to improve competitiveness of global business by maximizing the operational synergy with foreign subsidiaries.
Consideration
Cash		₩ 89,689
Total consideration transferred		89,689
Recognized amounts of identifiable assets acquired and liabilities assumed
Cash and due from financial institutions		24,150
Loans measured at amortized cost		191,039
Property and equipment		13,837
Intangible assets		13,409
Other assets		17,587
Total assets		260,022
Borrowings		146,588
Debentures		46,865
Other liabilities		19,233
Total liabilities		212,686
Total identifiable net assets		47,336
Non-controlling interests	[14]	9,467
Goodwill	[9]	51,820
Details of business combination acquisition related profit or loss
Expenses		1,064		₩ 1,623
Reflected operating income (loss) of Acquiree for the period after the acquisition date		(4,432)
Reflected net profit (loss) of Acquiree for the period after the acquisition date		(3,456)
Operating income (loss) assuming consolidated from the beginning of the current period		(26,166)
Net profit (loss) assuming consolidated from the beginning of the current period		(19,187)
The amount attributed to net profit (loss) to Shareholders of the Parent Company Assuming consolidated from the beginning of the current period		₩ (15,349)
[1]	Includes the effect of exchange differences etc.
[2]	The consolidated statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS 16, and the comparatives for the year ended December 31, 2018 has not been restated.
[3]	Memberships, software, development costs and others were previously held by Prudential Life Insurance Company of Korea Ltd.
[4]	Separately measured VOBA (Value of Business Acquired) was adjusted by applying an indirect method of intrinsic value to the carrying amount of insurance liabilities of the acquiree.
[5]	As a result of the business combination, gain on a bargain purchase was recognized as other non-operating income in the consolidated statement of comprehensive income.
[6]	Negative VOBA was recognized and adjusted in the insurance liability. In accordance with IFRS No.4, an indirect method of intrinsic value is applied to the measurement of VOBA. VOBA is a similar concept to present value of in force business (PVIF) and present value of future profits (PVFP or PVP). The VOBA from intrinsic values is calculated through the actuarial model and cash flows that were originally used to calculate the embedded value of the insurance contracts.
[7]	Memberships, software, development costs and others were previously held by Prudential Life Insurance Company of Korea Ltd.
[8]	Measured at the proportionate share (30%) of the fair value of PRASAC's net assets as of the acquisition date.
[9]	As a result of the business combination, there was a goodwill and the Group recognized it as intangible assets in the consolidated statement of financial position.
[10]	The sum of the existing non-controlling interests held by PT Bank Bukopin TBK and the proportionate share (33%) of the fair value of PT Bank Bukopin TBK's net assets as of the acquisition date.
[11]	In 2020, the Group measured 33.90% shares of PT Bank Bukopin TBK, which the Group held before the business combination, at fair value, and recognized KRW 30,277 million as gain on investment in associates in the consolidated statement of comprehensive income.
[12]	It is an identifiable intangible asset and reflects the fair value of financing costs saved through stable relationships with saving customers.
[13]	Software and other intangible assets which were previously held by PT Bank Bukopin TBK.
[14]	Measured at the proportionate share (20%) of the fair value of PT. Finansia Multi Finance's net assets as of the acquisition date.

Business Combination_Details _2

Business Combination_Details of of agreement with the existing shareholders of Acquiree(Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)
Information of agreement with the existing shareholders of Acquiree
Name Of Acquiree	Acquisition of PRASAC Microfinance Institution Plc. (PRASAC)
Summary Of Agreement With The Existing Shareholders Of Acquire	The Group has signed an agreement with the existing shareholders of PRASAC. The existing shareholders have the right of put option to sell 30% of the remaining shares to the Group, and they are entitled to exercise their rights at the exercise price calculated on the basis of the adjusted book value of net asset as of 2021 year-end, within six months from the issue date of the audit report or the confirmation date of the adjusted value. If the put option is not exercised until its expiry, the Group has a right to exercise a call option during the six months following the expiry of such put option. All shareholders are restricted from selling shares or additional pledge before exercising the put option and call option. In addition, the Group has agreed to pay dividends to existing shareholders of PRASAC for 30% of the amount exceeding USD 370 million based on the adjusted carrying value of net asset and this payment can be added to the exercised price of put option in accordance with the shareholders' agreement.
Amount of the recognized liabilities and deducted equity related to agreement
Other payables (present value of exercising price of options)	₩ 308,236
Other payables (present value of expected dividends)	102,986
Total	411,222
Attributable to ordinary equity holders of the Parent Company (capital surplus)	₩ (411,222)

Approval of Issuance of the C_2

Approval of Issuance of the Consolidated Financial Statements(Details)	12 Months Ended
	Dec. 31, 2020
Approval of Issuance of the Consolidated Financial Statements [Abstract]
Date Of Authorisation For Issue Of Financial Statements	Apr. 27, 2021

Parent Company Information_Cond

Parent Company Information_Condensed Statements Of Financial Position(Details) - Parent Company - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and due from financial institutions		₩ 23,084	₩ 18,537
Financial Assets at fair value through profit of loss		474,262	413,909
Loans at amortized cost		179,542	120,000
Banking subsidiaries	[1]	14,821,721	14,821,721
Nonbanking subsidiaries	[1]	11,698,159	9,340,395
Other assets		911,723	632,074
Total assets		28,108,491	25,346,636
Liabilities and shareholders' equity
Borrowings		100,000	0
Debentures		6,128,043	5,543,446
Other liabilities		894,828	621,291
Shareholders' equity		20,985,620	19,181,899
Total liabilities and shareholders equity		₩ 28,108,491	₩ 25,346,636
[1]	Investments in subsidiaries were accounted at cost method in accordance with IAS No.27.

Parent Company Information_Co_2

Parent Company Information_Condensed Statements Of Comprehensive Income(Details) - Parent Company - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income
Dividends from subsidiaries	[1]	₩ 1,573,411	₩ 926,934	₩ 1,089,556
Interest from subsidiaries	[1]	3,519	3,618	5,710
Other income	[1]	22,749	22,709	20,940
Total income	[1]	1,599,679	953,261	1,116,206
Expense
Interest expense	[1]	132,437	126,065	122,451
Non-interest expense	[1]	87,876	80,355	65,027
Total expense	[1]	220,313	206,420	187,478
Profit before income tax expense	[1]	1,379,366	746,841	928,728
Income tax benefit (expense)	[1]	49	(854)	(2,823)
Profit for the year	[1],[2]	1,379,415	745,987	925,905
Other comprehensive loss for the year, net of tax	[1]	(368)	(520)	(1,911)
Total comprehensive income for the year	[1]	₩ 1,379,047	₩ 745,467	₩ 923,994
[1]	The condensed statements of comprehensive income for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS No.16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	The condensed statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS No.16, and the comparatives for the year ended December 31, 2018 has not been restated.

Parent Company Information_Co_3

Parent Company Information_Condensed Statements Of Cash Flows(Details) - Parent Company - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net income	[1],[2]	₩ 1,379,415	₩ 745,987	₩ 925,905
Reconciliation of net income (loss) to net cash provided by operating activities
Other operating activities, net	[1]	9,930	(274)	(1,243)
Net cash inflow from operating activities	[1]	1,389,345	745,713	924,662
Investing activities
Net payments to subsidiaries	[1]	(2,347,543)	(100,000)
Other investing activities, net	[1]	(146,477)	(200,609)	(43,554)
Net cash outflow from investing activities	[1]	(2,494,020)	(300,609)	(43,554)
Financing activities
Net decrease in borrowings	[1]	100,000	(298,321)	(164)
Increases in debentures	[1]	1,537,091	1,037,656	897,872
Repayments of debentures and lease liabilities	[1]	(940,610)	(868,723)	(688,486)
Issuance of hybrid securities	[1]	1,296,693	399,085	0
Cash dividends paid	[1]	(883,952)	(766,249)	(766,728)
Acquisition of treasury shares	[1]	0	(274,317)	(224,700)
Net cash inflow(outflow) from financing activities	[1]	1,109,222	(770,869)	(782,206)
Net increase(decrease) in cash and cash equivalents	[1]	4,547	(325,765)	98,902
Cash and cash equivalents at January 1	[1]	18,534	344,299	245,397
Cash and cash equivalents at December 31	[1]	₩ 23,081	₩ 18,534	₩ 344,299
[1]	The condensed statements of cash flows for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS No.16, and the comparatives for the year ended December 31, 2018 has not been restated.
[2]	The condensed statements of comprehensive income for the years ended December 31, 2019 and 2020 are prepared in accordance with IFRS No.16, and the comparatives for the year ended December 31, 2018 has not been restated.